Abstract:In this paper， the experimental study on the self-tapping screw's pullout resistance in the wood structure was conducted. Domestic ordinary screws were used together with imported or domestic wood to fabricate 6 screw connection specimens in wooden walls. Then monotonic loading tests were conducted and it can be concluded that， the common round screw connection strength mainly depends on the failure mode， the lack of cooperation effect significantly influences the strength of screw connections， and the dispersion of screw connection stiffness is high. So， to obtain formulae for the self-tapping screw connection strength and stiffness by further experimental study will be very necessary.

Abstract:For exploring the practicality of engineered bamboo products in timber structure， the formula of dowel bearing strength parallel to the grain was investigated. In this paper， seven groups of twenty eight specimens were tested. The effect of the thickness of engineered bamboo products， end distance and pin diameter on the maximum load， stiffness and dowel bearing strength were analyzed. It was showed the thickness of engineered bamboo products had no effect on the dowel bearing strength. The effect of end distance on the dowel bearing strength could be negligible with the end distance greater than 64mm. And the dowel bearing strength approximately linear improved with the decrease of pin diameter. The influence coefficient of pin diameter was obtained by regression analysis. Finally， a simplified theoretical calculation formula of dowel bearing strength was establishment. And the results of dowel bearing strength by the theoretical calculation formula had a good agreement with those obtained by test.

Abstract:Ground-anchored suspension bridge owns a neat structure as well as can use the stiff rock condition at the ends of the bridge to share the forces. While under the effects of earthquake motion， the large longitudinal displacement of the girder poses great threat on the safety and serviceability of the bridge. By the way of nonlinear time-history analysis， this paper emphasizes the effect of hydraulic viscous damper on the seismic reduction of ground-anchored Suspension Bridge with single tower and the damper parameter analysis based on Tongmai Bridge. The study indicates that the hydraulic viscous damper can effectively control the longitudinal displacement of the girder. And when the damping index coefficient a remains constant， the longitudinal displacement of the girder decreases with the increase of the damping coefficient C， but the decreasing magnitude is small. On the other hand， the variations of the coefficients of the hydraulic damper have little influence on the forces of critical sections of the tower and foundation.

Abstract:Under the action of lateral forces and vertical loads, the connection of reinforced concrete slab-column structure will not only transfer significant shear forces, but also unbalanced moment. As to the edge slab-column connection, even if there is no later force, it will also transfer unbalanced moment due to the asymmetry. Currently, most tests and studies focus on interior connections, but there are few tests or studies on edge slab-column connections. A relatively new type of shear reinforcement named shear-stud reinforcement was applied in edge column-slab connections and study on the seismic behavior of these connections was conducted. Tests and finite element analysis of three full-scale reinforced concrete edge slab-column connections subjected to gravity and unbalanced moment were completed in this paper, and main conclusions were as following: the bearing capacity, deformation capacity and seismic behavior of connections reinforced with shear-stud reinforcement are improved; deformation of specimens reinforced with shear-stud reinforcement could meet requirements of current codes; the performance of energy dissipating is as good as the common connections, and has reached the medium ductility level.

Abstract:Using nonlinear finite element software ABAQUS to analyze and numerically simulate the beam-column joint of high-rise steel framed structure with BRB and with ordinary support. Analyzed and compared the seismic impact on frame joint with the two support. For the beam-column joint with BRB， conduct its parameter analysis about the yield strength of the supporting inner core， the size and thickness of the gusset plate， and the length of the stiffener on the gusset plate. The results showed that the BRB has the good performance of energy-consuming with the constrains come from the wrapped steel and concrete. And with the yield's reduction in strength of the supporting inner core， the increase in the scale and thickness of the gusset plate， as well as the increase in the length of the stiffener on the gusset plate， the hysteresis curve of the beam-column joint display more fuller， which have better seismic performance.

Abstract:Reinforced concrete specimens with concrete compressive strength varied from 46.5 to 50.6 MPa and with depth of cross section from 250 mm to 1 000 mm subjected to bending were tested. Size effects of flexural behavior with respect to bending capacity and deformation capacity were investigated based on the analysis of the test results and those of high-strength specimens (fcu=72.1~72.4 MPa) of which the geometry and reinforcement layouts were identical to those of specimens tested in this study. It is shown that beam depth does not has any apparent influence on nominal cracking moment， nominal yield moment and nominal ultimate moment， and that it has significant influence on displacement ductility and plastic rotation capacity of plastic hinges of members. For normal-strength concrete specimens and high-strength concrete specimens， both the displacement ductility and the plastic rotation capacity decrease with the increasing of depth in the similar ways， and are independent of concrete strength. It is also demonstrated that the lengths of plastic hinges of members with different depth and concrete strength are approximately equal to the depth.

Abstract:The reinforced concrete beams which have been bending damaged are repaired by the six kinds of repair materials and its related methods. Based on the linear polarization method， the corrosion situations of the steel bars in the repaired concrete structures were studied， which were immersed in 5% magnesium sulfate. The results show that: different repair materials and its related methods， significantly affect the steel corrosion performance of patched members. The repairing method， cement-based repair mortar with zinc wire connected with the bar， can most effectively improve anti-corrosion ability of reinforced concrete. There is an exponential relationship between the polarization resistance and corrosion current density， and the relationship formula between the polarization resistance and corrosion current density was put forward.

Abstract:The size effects on axial compression performances of reinforced concrete column under repeated load are needed. Specimens were designed and tested in accordance with the relevant similarity， whose geometric dimensions are: 400 mm×400 mm×1 200 mm， 600 mm×600 mm×1 800 mm and 800 mm×800 mm×2 400 mm. The result of the experiment， the failure characteristics， crack development process， strength， peak stress， peak strain and stiffness of various specimens were comparatively analyzed. The results show that， within size range of this test， size effect exists on performances of columns.

Abstract:In American code for design of Concrete Structures (ACI 318-08)， the strut-and-tie model method was used as a normative appendix for D-region design of reinforced concrete members. The constituent of the strut-and-tie model was introduced. Calculation of internal forces in struts， ties and node zone were proposed according to the design parameters (loading， concrete strength， steel strength) of the current Chinese code (GB 50010-2010).Then the design procedure was provided. Strut-and-tie model design method for reinforced concrete corbels was proposed following Chinese code parameters which degree of safety was compared with in ACI 318-08 through an example. The compared result shows that the proposed method can be used for the design of reinforced concrete corbels with clearer mechanical concepts and easier calculations.

Abstract:Based on the characteristics of the bridge construction accident， the bridge construction safety accident rheological rule curve was drawn by studying on the theory of rheology and mutation bridge construction safety accident law. The bridge construction safety accident rheology and mutation mathematical model was set up， and the cause of the accident and the relationship between rheological mutation curve was analyzed using the mathematical software MATLAB based on the mathematical model. Initial safety and attenuation rate of accident time effect was obtained by means of verify and analysis on the mathematical model. The rheology and mutation mathematical model is proved to be reasonable， through studying on the deformation monitoring data of support structure during construction.

Abstract:Pagoda of Six Harmonies is a protected unit of cultural relics in China whose last maintenance dates back to the 1990s. Now Pagoda of Six Harmonies needs to do some preventive maintenance which required protecting the visitors' normal visit. This time a new type of suspension truss cantilever scaffold is used in the engineering. Numerical simulation and 1:1 model load test are employed to prove the serviceability of applying the suspension truss cantilever scaffold to maintain the Pagoda of Six Harmonies. The result of the numerical simulation and the model test is used to comparative study. Comparing the loading performance shows the stress of the members smaller than the structure's critical load intensity. In the meanwhile， the strain and deformation conform to the national standard. Therefore， the scaffold can be applied to the engineering successfully. This paper provides a reliable technical support for the preventive maintenance of the pagoda of Six Harmonies.

Abstract:For high-rise building of RC Frame Structures， its security problems with wind load is more important， in this paper the mechanical model is established to simulate the atmospheric flow field around high-rise building， and the modal analysis is carried on for the structure. The simulation results show that velocity contour of wind field and pressure change contour describe the wind field characteristics. Wind velocity and pressure change near frontwall and backwall will affect obviously the vibration characteristics of high-rise building. Natural frequency and vibration mode can be obtained though modal analysis of high-rise building with wind load action， and necessary measures will be taken to avoid unnecessary losses due to resonance factors. And harmonic response is analyzed for high-rise building with load action to avoid resonance.

Abstract:Structure health monitoring is very necessary for Guangzhou New TV Tower(NGTVT)， which is a 610 meters high high-rise steel structure. This paper applies multiple reference DOFs stabilization diagram algorithm(M-NExT/ERA)， Data-Driven Stochastic Subspace Identification (SSI/Data) and Enhanced Frequency Domain Decomposition(EFDD) to the extraction of modal parameters of GNTVT on the basis of acceleration measurements(GNTVT Benchmark). Then Finite Element Model of GNTVT is modeled using GNTVT， at last the modal parameters results are used for the model updating based on Genetic Algorithm of GNTVT EFM model.

Abstract:To analysis the effect of the level of thick plate transition layer on structural seismic performance，according to the code for seismic design of buildings， we systematically studied the failure mechanism and calculation method of structure under earthquake action and built the motion equation of buildings. Natural period of structure，floor displacement and inter-story displacement angle were used as the seismic performance indicators and they were analyzed by mode-superposition response spectrum method.It is shown that with the increase of the thick plate transition layer，the natural period of structure in the low order mode increases，the floor displacement and inter-story displacement angle rise, and the whole structure seismic performance declines.

Abstract:Earthquake was listed as the first group of disaster because of its sudden， unpredictable， destructive and secondary disasters. Building structure that is safety and stable directly affects the people's life and property safety. So the structural seismic research has the important practical significance. Based on the finite element principle， we used general finite element software ANSYS to establish the finite element model of frame structure.

Abstract:Through thousands of accidents summarized by the department of quality supervision， comparing the design， manufacture， installation， using， and maintenance， through statistics， modeling and experience formula， the index is quantized and the calculation formula of failure probability of pressure vessel is obtained. According to the parameter， the pressure vessel can be examined quickly， be classified safely and provide support for failure probability.

Abstract:With the social progress， some modern method has been used in the industry. It can reduce the failure of pressure vessel. The method includes supervision， emergency cut-off and emergency relief etc. Each method is refined and quantized in the article. And it helps exact forecast for the failure.

Abstract:It has become a very common phenomenon that the influence of pit excavation to the adjacent environment， what corresponding measures should be taken in design and construction to ensure the safety of construction in process and existing has become a key part. This Paper analyses the influence of pit construction to adjacent tunnel by using the finite element software plaxis. The analysis results show that strengthening the palisade structure stiffness and partitioning symmetric excavation can significantly control the deformation of the existing tunnel. The design and construction of the engineering can ensure the safety of the existing tunnel compared with the conventional construction methods， and it also shows that preliminary analysis of influence to the adjacent underground building before pit excavation is very necessary.

Abstract:For IV、V、VI levels of weak rock， because of different levels， The calculated load of tunnel surrounding rock according to the relevant specification was too different. Based on surrounding rock sub-classification method of current highway tunnel， the relation between the new surrounding rock classification and the elastic p-wave velocity refining that was used by railway tunnel was built. The phenomenon of elastic p-wave velocity cross overlap was avoided when surrounding rock classification was different in railway tunnel. For Ⅲ、V、V、VI levels of weak rock， the further refining was done by Vp in railway tunnel， in order to calculate primary support design pressure of surrounding rock， so the oversize difference of computation load value Between adjacent classification was avoided. Combining with a subway tunneling of Qingdao， comprehensive fuzzy identifying method is used to judge Surrounding rock classification level of refinement and adjust， which is more safe and economical for design and construction.

Abstract:On the background of Yuzhou tunnel at the airport road of Chongqing， it is one small spacing tunnel with serious bias. On` the basis of engineering geology， choose the tunnel section with bias most serious and then build the ANSYS finite element model to simulate the process of broaden. Analyse the surrounding rock displacement， stress strain and plastic zone when the tunnel is broaden or not. Conclusion that in the process of tunnel broading， the displacement of surrounding rock dome downward is big; In addition， as the influence of bias from the surrounding rock above the central rock pillars and right tunnel side wall bears big compressive stress and produces soil plastic deformation. Finally， suggest strengthening the support on the two area above-mentioned in the process of construction.

Abstract:The material parameters and geometric parameters of wedge slopes have high variability， and there are several failure modes for a wedge slope. It is necessary to carry out system reliability analysis for wedge slopes. We consider a wedge slope as a series system which is composed of four failure modes， and we consider each failure mode as a parallel sub-system with three components. Then， the reliability analysis is carried out by using the product of conditional marginal method and bound method of system reliability analysis. A new method for the linearization of nonlinear performance function is proposed for computing the coefficient of correlation between each failure modes in the parallel sub-system. Through the reliability analysis of a wedge slope， it is illustrated that a wedge slope can be considered as a series-parallel system， and the new linearization method can simulate the failure domain accurately. The failure modes computed from the reliability analysis and the deterministic method is different. Reliability analysis method is suitable for the design and management of wedge slopes.

Abstract:Using different constitutive model to simulate the settlement of the fourth stage of shield excavation respectively，the models used were the anisotropic constitutive model(EVP-SCLAY1 model) and the isotropic models(MC model and MCC model)，then the results with the three models and the measured datas were compared.The results show that the simulation result with the anisotropic model is more consistent with the measured results in simulating the settlement rang and surface settlement of shield excavation，and MC model prediction results are the worst.

Abstract:In order to reveal seismic behavior of batter pile group with high-rise pile cap， taking three kinds of earthquake waves as example， the effect laws of inclination angle and free pile length on seismic response were analyzed based on three-dimensional elastic-plastic dynamic finite element model. The results show that the maximum axial force of pile appears in 25 m approximately beneath the maximum erosion line and the maximum bending moment is located in the interface between pile cap and pile shaft. The vertical displacement and Y-orientation bending moment are symmetrically distributed along the pile shaft， and acceleration， lateral displacement， axial force， bending moment distributions along pile shaft are in the same trend. The greater free pile length， axial force of pile is larger and bending moment of pile is smaller. The greater inclination， axial force and bending moment of pile are larger. The influence on internal force is greater by the pile free length than the pile inclination. Subjected to the seismic load， acceleration and displacement of batter pile decrease， but its axial force and bending moment increase. The total bending moment of batter pile is controlled by Y-orientation bending moment.

Abstract:To analyze properties of frozen ground and bearing capacity of tower foundation for the Qinghai-Tibet DC Engineering， tests of fine-grained soil properties and frustum-column spread foundation loading under three-directions loading condition were carried out in the Wudaoliang area of Qinghai-Tibet Plateau， while the shallow backfilled ground was in the freezing and thawing state. According to results of loading tests， bearing characteristics of frozen ground and tower foundation was analyzed， and ultimate bearing capacity was obtained in the interaction limit state between foundation and ground through establishment and fitting analysis of the load- displacement hyperbolic model. Based on measured values of soil tests， engineering properties of the ground were studied， the ground surface settlement of thawing period relative to freezing period was calculated and was 0.23m， and the calculated value was consistent with actual situation. For thawing or freezing state of seasonally thawed layer， the stability analysis model and method of tower spread foundation under uplift conditions were proposed respectively， and uplift angle of frozen backfilled soil was calculated and was 20.5°. The results show that shear strength of ground and bearing performance of foundation are larger in the freezing state than in the thawing state of seasonally thawed layer， and the bearing capacities of foundations can meet the design requirements. Void ratio of fine-grained soil is reduced， density is improved， water content and degree of saturation are increased while frozen soil thawing. The freezing or thawing state of soil has great influence on mechanical parameters of ground including the shear strength， uplift angle， etc. So keeping the freezing state of deep backfilled ground is very important to bearing safety of the engineering foundations.

Abstract:Rapid urban development in cities often requires construction activities close to existing tunnels， including basement excavation directly above the tunnels. Based on three dimensional finite element method， the influence of basement excavation on the underlying tunnels was studied. In the numerical model， A tunnel was located under a rectangular excavation with its axes parallel to the long side of the rectangle. The results of numerical analyses indicate that for the tunnel located underneath the centerline of the excavation， overlying excavation will cause the shortening of horizontal diameter and the lengthening of vertical diameter of the tunnel lining. For the tunnel located close to the diaphragm wall， maximum diameter changes often take place in a sub-vertical direction due to the rotation of the tunnel lining during excavation. The spatial effect of the excavation also has an obvious influence on the displacement and distortion of the tunnel cross section.

Abstract:With the rapid development of shield， construction risk attracts comprehensive attentions in deep foundation pit engineering. Taking as an example the foundation pit excavation construction of 3shield shaft project in South-North Water Diversion main canal project， the WBS method was brought forward to break down the work of deep foundation pits based on the engineering geological conditions and the condition of surrounding in the 3shield deep foundation pits. Then its risk events and factors of construction of deep foundation pits were identified by use of the fault tree method. Finally， the construction risk degrees of all kinds were evaluated and decided in accordance with the general integration risk assessment method based on the AHP method. The method could be used to evaluate the risk degree of similar project.

Abstract:Adhesive anchors are widely used as post-installed fasteners in civil engineering. A typical steel-to-concrete connection includes multiple anchors which are commonly subjected to combined moment and shear loading. Based on the assumption that all anchors take up shear load， a revised method is developed for the design of ductile anchors， which considers that only the row of most stressed anchors in the tension zone are needed to meet the elliptical interaction of tension and shear capacity requirement during the design process of anchorage group under combined shear and moment loading. The ultimate strength of post-installed fastenings should be controlled by the strength of anchor steel for the purpose of connection safety and full utilization of anchor capacity. For the objective of ductile design in anchor group， the ratio of shear span could be used as an evaluation parameter in the process of strength prediction. According to the theoretical analysis and results comparison， the ductile failure of anchor steel in post-installed fastenings can be guaranteed when the ratio of shear span is greater than 0.6 and other anchorage requirement is met. In the end， design proposals and construction specification of anchor group are given for practice.

Abstract:The dredged material of urban river (DMUR) is of high water content、rich in organic matter、smelly odor and sometimes also contains toxic and hazardous substances. Harmless and resource utilization of DMUR became an important research topic of urban sustainable development. In this study， the dredging project of Nanjing Qinhuai River were taken for example， the DMUR and clay were used as raw materials to produce sintered brick. Percentages of DMUR in raw materials range from 50% to 70% by mass ratio， and brick specimens sintered at kiln temperatures of 1 000℃、1 050℃ and 1 100℃. In order to analyze the impact of clay content and kiln temperature on the sintered specimens， mechanical tests were performed to measure bulk density，weight loss on ignition， shrinkage， water absorption and compressive strength；Chemical compositions and microstructures of the samples were investigated using X-ray diffraction（XRD） and scanning electron microscopy (SEM)，respectively. The results indicate that the kiln temperature has significant effects on sintered specimens， 1 050℃ is the suitable kiln temperature for these specimens; when the clay content is gradually increased， the physical and mechanical properties of sintered specimens gradually increased. Under the optimum preparation condition（DMUR content of 50%， the sintering temperature is 1 050 ℃）， bulk density，water absorption， the linear shrinkage， compressive strength of the sintered bricks were 1.4 g/cm 3，17.28%，-0.5%，12.56 MPa，respectively， meeting the requirements of common bricks. The results of the study have references significant for resource utilization of DMUR.

Abstract:A number of rubber cement dosage specimens that rubber powder dosage different were obtained using same cement， water and fine aggregates， by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement mortar by measuring its liquidity， strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand， the fluidity of cement mortar almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing， compressive strength and flexural strength of 7 days and 28 days of cement mortar reduced， but toughness and wear resistant present linear growth trend when dosage of rubber powder less 30%.

Abstract:An experimental study of the splitting tensile strength and compressive strength were carried out. Effects of PVA fiber was analyzed on ratio between splitting tensile strength and compressive strength. The dimensions of cubic specimens were 100 mm×100 mm ×100 mm. PVA fiber were added at the volume fractions of 0， 0.5%， 1%， 1.5%， 2% and the fly ash content were 30%, 50%. The test results indicate that， the compressive strength varies very little after incorporation with PVA fiber， however， the splitting tensile strength increases from 42.64% to 135.12% and the ratio between splitting tensile strength and compressive strength increases from 36.82% to 134.27%. What's more， the compressive strength of cementitious composite including fly ash at the ratio of 30% is 20% higher than that of 50%，and there is no obvious improvement on the splitting tensile strength with the change of fly ash content. This paper also shows that the compressive test cube of PVA fiber cementitious composites has multiple cracks and is hardly crumbled in the degradation process， and then the compressive toughness can be enhanced significantly.

Abstract:Toward the characteristics of petrochemical engineering construction project and the need of project management performance evaluation, this paper analyzed the status of project management performance evaluation study and the status of project management performance evaluation study in petrochemical engineering construction project. This paper suggested the direction of project management performance evaluation study in petrochemical engineering construction project, which is to establish the performance evaluation index system of petrochemical engineering construction project management and performance evaluation method, to establish process performance evaluation system of petrochemical engineering construction project management, to develop performance evaluation software of petrochemical engineering construction project management.

Abstract:The airport gate in Xinjiang Bole is created by a logic reasoning process of made sure artist conception， deducted artist conception (include space and style deduction) and overall consideration， transferring the abstract artist conception to concretization creation. It lively deducted regional architecture characteristics with northwest desert and frontier amorous feelings. Through the creation course， we raises a design method of deducting artist conception by logic， brings up a new create thinking for the gate and other architecture design.

Abstract:Transport hub is the foundation of the national central cities development. And it is also a gathering radiation platform which can optimize the allocation of national resources and lead the regional economic and social development. This paper through researching on the scope of Chongqing foreign traffic radiation， judged that Chongqing as a comprehensive transportation hub in inland is establishment. In order to further strengthen national center city hub function， expand the global contact and service scope， strengthen the higher international status， this paper give further practice development suggestions which are planning the hub airport and air - iron-port transport system.

Abstract:Base on the Kevin Lynch's city image theory， from the path， edge， district， node， landmark five cognitive maps to analyses the space structure and characteristics of Xing Cheng city. And Base on these analyses to discuss how to control the spatial morphology of Xing Cheng city， which provides a theoretical reference and reference examples for the protection and control of ancient city spatial morphology in the future.

Abstract:In this paper， the Sunflower of Tianjin University and the Bamboo of Tongji University of 2010 solar decathlon of Europe were analyzed， which applied the ecological design concept of traditional residence in the zero energy and low cost solar house. This paper through analysis the both team， discuss the solar houses development， proposed the china solar house rely on the traditional idea， design combined with the energy， using low cost， with appropriate technology. This Solar Decathlon Contest of Asia would be hold by china， in Datong city， 2013.

Abstract:Large amounts of high-temperature gases were generated in ironmaking plant and ideal acceptable hood above the heat source was not installed affected by process conditions. At the top of the exhaust hood， dust easily escaped because of thermal plume.Based on the test data of dust composition and size distribution in ironmaking plant， numerical models suitable for high-temperature dust gases were established and key boundary conditions for the gas-solid two-phase flow under high-temperature conditions were determined.The study shows velocity decay of convergence field is sharp at the suction outlet and thermal plume is strong in the exhaust hood. The control method of pressure distribution and the key factor to prevent high-temperature dust escaping are proposed in the exhaust hood. Optimized design and engineering practice of the exhaust hood are given when the suction outlet is on the side after analyzing the flow field resulted from coupling effect of thermal plume and ventilation airflow.

Abstract:A comparative study is addressed between China GBL and some typical foreign Green Building Assessments, including BREEAM, LEED and CASBEE, focusing on the contents, weight system and requirement for Land Use. Through comparison, it has been found that site selection, land utilization, ecology environment are the main components of Land Use (hereafter referred to as LU). The land utilization occupied the most scores than the summation of other factor in LEED, The ecology environment occupied the most scores than the summation of other factor in CASBEE, and still the land utilization and ecology environment occupied the most scores in BREEAM and China GBL. Meanwhile, also found several common indicators being paid attentions in all GABSs. Besides, China GBL is characterized with its large amount of prerequisites than the other GBASs, and the requirements on Land Use category becomes stricter responding to higher green building labels.

Abstract:A comparison research is launched for the Indoor Environment Quality indicators of the popular Green Building Assessment systems and China Evaluation standard for green building, including the IEQ indicators’ contents, weightings, and the scoring requirements for different green building ratings. By comparison, it was found that the indoor environment is mainly composed by IAQ, version environment, thermal environment and the acoustic environment, and the IAQ is the most important component in these systems. Although there is no weighting system or scoring system in China Green building assessment system, it is characterized by the relatively numerous prerequisites and the achieved indicators requirement for different ratings. Besides, the indicators paid with intensive attention in these systems are found.

Abstract:It is well known that green energy-saving building should be popularized with great effort. But when it comes to practice， a key stage of building design is how to choose energy-saving technology， products and measures for raising energy-saving levels according to a building's own features. In order to solve the problem， we consider simulate energy-consumption analysis as a tool to synthesize the effect of indicators， such as wall insulation， sunshade， lighting， ventilation etc. Then we compare the result with the national standard to make sure that the energy-saving technology， products and measures really work. As a result， the energy conservation measure can be determined and prominent energy-saving effect can be achieved.

Abstract:The principle of the energy equilibrium is applied to establish the relationship between heat loss and supply， indoor and outdoor temperature， supply and return water temperature of heating system for a building. A numerical simulation model of supply-return water temperature is deduced. The heating system mathmatical model for the office building in Beijing area is developed Based on the hourly air temperatures at the automatic weather observation station and observed indoor temperature from the office building in February 2010 in Beijing area，a simulation experiment of hourly prediction for next 24-hours is executed. The test results show that the simulated and observed supply and return water temperature changed significantly when the outdoor air temperature changes， it is inversely proportional relationship between them， the correlation coefficient is -0.95， the simulated indoor temperature has remained near the designed temperature. There is a consistent trend between simulated and observed heating， as outdoor air temperatures rise， the simulated heating declined， it can save nearly 8 % for heating. This means the simulated model of supply-return water temperature has a good quality.

Abstract:A detection and diagnosis has been performed on the bad effect of the central air conditioning system of a theater，and the site test on the actual operating conditions of the plate heat exchanger has also been proceeded. In this paper， based on the correction of the measured heat transfer obtained by actual measurement，the specified logarithmic mean temperature difference heat transfer rate and the specified flow heat transfer has been obtained. By using the specified heat transfer rate as a comparison and regarded as a basis of judging of the performance of plate heat exchanger. Finally， the corresponding recommendations about the actual operation of plate heat exchanger and the steps of the performance diagnostic has been put forward in this article.

Abstract:There are many schemes of residential central air conditioning systems for selection， the selection is affected by many factors， the reasonable selection of evaluation indexes is the key factor for the proper option. In this paper， in order to evaluate the performance of the whole system synthetically， the gray comprehensive evaluation method is introduced and used， the mathematical model for optimization and selection of air conditioning schemes is established， and with an example of residential building in Beijing the index values of chosen six air conditioning systems are calculated and optimized. The schemes are the air-source heat pump system， household gas-fired air conditioning system， air-cooled chiller unit/gas-fired boiler system， water loop heat pump system， ground-source heat pump system and solar heat pump system. In the process of optimization calculation， the aspects of economics benefits， energy saving， environment protection and system reliability are taken into account. According to the calculation results， the water loop heat pump system is proposed to be optimal option under the given conditions.

Abstract:In recent years， sewage source spray heat exchanger was widely used in sewage source heat pump systems with its higher heat transfer coefficient， easier operation and maintenance and less energy， etc. In this paper， we studied the direction arrangement of heat exchange tubes of spray heat exchanger. And the heat transfer coefficient， film coverage， effective area ratio has been studied through mathematical tools and CFD simulations and other means. The results showed that in the sewage-source heat pump project， when the engine room area is relatively small but highly space is sufficient， the vertical arrangement of spray heat exchanger tubes can obtain a good effect.

Abstract:In recent years, rural residences go into a period of large-scale construction. Rural residences and urban residences are quite different in Layer, construction and service time. Little existing research on rural residences construction, and more research pay attention to optimize the design of the external window energy saving and ignores improving indoor light environment, such as Chongqing area. Main factors of external window are window-wall ratio, window glass types, external shading, etc. The factors influence the lighting and air-conditioning energy consumption at different levels and the consumption between lighting and air conditioning energy are opposite. In this paper, based on the average coefficient of indoor day lighting, use DesignBuilder software establish the model of the typical rural residences and use orthogonal experiment to analyze the results. Get the result: window-wall ratio＞window glass types＞external shading. And through the lighting standard conditions get the smallest window wall ratio in different glass types and external shading condition.

Abstract:In summer， sun-shade is essential for building energy conservation. Using green plants as a sun-shade material is an effective way to protect windows from solar radiation， save building energy and improve the environment. This design bases on the observing of window sill greening which plant by residents spontaneously and advances to a movable green plants sun-shade component on windows. The improvement makes the component become an adjustable ecological energy saving measure， which could meet the requirements of natural lighting and ventilating. Through the experimental data， we can find out that the awning window shading coefficient can reach to 0.1 ~ 0.2， and sun radiation heat can be kept out by 80%~90%.

Abstract:In order to study thermal insulation performance of the metal venetian blind for shading， the solar heat gain coefficient of 3mm clear glass、the shading coefficient of metal venetian blind for shading and inner-outside surface temperature of the 3mm clear glass under different conditions are tested and analyzed by the shading coefficient test platform that is based on solar-simulated light source. The results show that the metal venetian blind for shading holds about 87% of heat from the solar radiation when the metal venetian blind is closed， and the metal venetian blind for shading holds about 43% of heat from the solar radiation when the metal venetian blind is levelled. The analytical results have guiding-significance for thermal insulation evaluation of the metal venetian blind for shading.

Abstract:The article uses the large Eddy simulation of Fire Dynamics Simulator（FDS）and parallel computing methods to numerical simulation on fire facilities in an underground garage. The main research is the effects of exhaust system and automatic sprinkler system in fire scene. Results show that: exhaust system can discharge high temperature and toxic gases， reduce smoke concentration and improve visibility effectively. Automatic water spray equipment mainly reduces heat release rate， and make smoke flow near the ceiling， which control the fire temperature very well. Combined with mechanical smoke exhaust system， it can better control the development of fire and effectively put out the initial fire. This study provides reference for fire safety design and assessment， which is of great significance to reduce casualties and property losses caused by the fire of underground garage.

Abstract:According to the principles of various methods and energy consumption characteristics in Chongqing， new method of energy saving calculation is proposed for public buildings. It's shown that building envelope， facilities and energy management play the key role in energy saving reconstruction. Considering the difficulty of measuring adjustment quantity， the calculation should be under some certain prerequisites (design conditions)， also the prevailing industry standards can be fully utilized. During the energy saving calculation， another key point is how to reflect the contribution rate of the single technologies for energy saving reconstruction.

Abstract:An integrated solution for life cycle management of buildings was developed based on the methodology of Life Cycle Assessment (LCA). It supports environmental evaluation of multiple life cycle stages of a building， i.e. production of building materials， building design and construction， and operation of buildings. The features of this solution are introduced in this paper. The solution may provide a tool for assessment and management of green buildings.

Abstract:In order to make a reasonable evaluation on operating environment and energy efficiency in city tunnel， the distribution of CO concentration in different types of city tunnels has been studied. Three typical city tunnels have been researched， the main parameters of their operating environment have been tested， the electricity consumption has been stated. Operating environment and energy efficiency of different tunnels have been analyzed. Principal component analysis has been used to establish a theoretical model of evaluation of operating environment and energy efficiency， a comprehensive assessment has been conducted. Relatively optimal operating mode of the tunnel has been gated. This conclusion has a certain reference value for the construction of city tunnel.

Abstract:The regularity of radon exhalation is affected by the weather and the ventilation in the over-broken granite tunnel. Based on the calculation model of radon exhalation in tunnel， some experiments have been carried out to analyze the variation of the radon exhalation in natural ventilation， blowing and exhaust conditions separately. The result showed that there is a linear relation between the radon exhalation and the natural ventilation， the temperature outside the tunnel also works as the same. It also shows that in the same condition of the tunnel's air flux and the outside temperature，the radon exhalation in exhaust case is 63% higher than the blowing case. When the temperature outside is high works in tunnel should avoid， and the blowing ventilation could be an effective way for reduction of radon concentration.

Abstract:A pilot modified four step-feed process was applied to deal with weak municipal wastewater. After 133 days of continuous operation with different hydraulic retention time(HRT) and operation strategy， the results are obtained as the following: (1)When HRT is reduced from 8.7h to 6h， there is almost no effect on performance of COD and TP， but would lead to increase effluent NH4 +-N and TN. Meanwhile， the influent carbon source utilization and simultaneous nitrification and denitrification (SND) are correspondingly decreased. (2)When HRT is 6h， the DO concentration in areobic zones are controlled between 1.0-1.5 mg·L -1 and adding suspended carriers in aerobic zones， the effluent performance of COD， NH4 +-N， TN and TP are 25.92， 1.98， 14.5and 0.47 mg·L -1 respectively. (3)Suspended carriers can be used to optimize the effluent ammonia and SND performance， and achieve 22% of TN removed through SND with suspended carriers. However， it's not obvious for suspended carriers to improve the influent carbon source effective utilization.

Abstract:Combining with influent quality in summer and three loading conditions (low， medium and high)， parameter optimazition of continuous micro-filtration (CMF-S) is studied through pilot-scale test. Results show that: 1) optimal operation of CMF-S can retard membrane fouling， improve operating efficiency and reduce the costs; 2) according to operation data of the CMF-S system， the mathematical model of △TMP growth can be obtained， by which we can identify the major influencing factors， and then regulate operating parameters under different conditions to achieve operation optimization of microfiltration system.

Abstract:A mathematical model of droplet motion and evaporation in flue gas has been established to analysis the feasibility of desulfurization wastewater evaporation treatment in flue gas duct. The parameters such as the duct structure， the flue gas temperature and the diameter liquid droplet are analyzed; the states of evaporation of liquid droplets are obtained under various working conditions. Moreover， a further comprehensive optimization and quantitative analysis have been carried out on unevaporated liquid quantity with various flue gas temperature and droplet diameters. The results show that this approach of evaporating desulfurization wastewater by flue gas in duct is feasible. The study provides support in further practical application for engineering.

Abstract:Linkage control of fire-fighting electrical equipment effectively and reasonable design, installation and debugging of power supply and distribution are increasingly important to ensure the safety of underground space. As the linkage control systems associated with the fire control electrical equipment are very complicated, and the distribution of installation and debugging are very professional, there are many hidden troubles of safety in the whole life cycle process. On the basis of analysis of characteristics of underground space of fire, underground fire-fighting electrical equipment and the requirement of power supply system are expounded, hidden dangers on linkage control of electrical devices and design installation and debugging of power supply and distribution underground space are analyzed, and some suggestions and countermeasures are provided for relevant departments as decision-making reference.