Abstract:The proposed fine beam model is different from that of Euler beam and Timoshenko beam. Some effects were considered in the new model such as shear displacement，the additional axial displacement produced by lateral bending and the additional transverse displacement produced by reduced stiffness due to transverse shear deformation. The formula of strain and internal force of the fine beam model，applied to Vector Form Intrinsic Finite Element (VFIFE) analysis，were derived and corresponding programs were developed by Fortran language. Cantilever beam，both ends clamped beam and portal frame are analyzed and the vertical displacements were compared using different beam element models. Numerical results showed that when the depth-span ratio was relatively small，the vertical displacements obtained by different beam model had slight difference. When the depth-span ratio was larger，the vertical displacement obtained by the fine beam model was obviously larger than that obtained by the Euler beam and Timoshenko beam. Therefore，the shear displacement，the additional axial displacement and the additional transverse displacement caused by stiffness reduction should not be ignored when the deep beam was analyzed. The new beam model proposed in this paper demonstrated more accurate results when the beam had a large depth-span ratio.

Abstract:In order to identify the key factors inducing the surface subsidence while shield tunneling，a key parameter selection model and solving method based on RS-SVM is proposed. The information entropy rules were used to discretize seven continuous variables including Internal Friction Angle(IFA)，Cohesive Force(CF)etc. Genetic Algorithm and Rough Set for attribute reduction were combined to obtain several collections that significantly affect the surface subsidence; Using the statistical learning of RVM to select the best collection which optimally reflects the relationship between parameters and surface subsidence，we get four parameters: Single Ring Grouting Pressure，Internal Friction Angle，Specific Torque(ST)，Incision of Slurry Pressure and each of the collections was the critical parameter that should be considered in construction. The method was applied in a completed metro tunnel in Wuhan，China and the results indicated the feasibility of the method.

Abstract:To describe the complex behavior of overconsolidated soil，an improved overconsolidation state variable subloading surface model was presented. The multiple impact of plastic volumetric and shear strain on overconsolidation state variable R was considered in hardening equation. The stress-update algorithm and the procedure of numerical implementation were introduced. The the model was applied by compiling the interface subroutine in finite element software ABAQUS. The rationality of the subroutine was verified by numerical simulations in different working conditions and load types. At last，Fujinomori Clay was simulated by the model in compression test，and the results were compared with those of UH model and experimentation data. The subroutine was precise and steady andthe model proposed can describe the properties of overconsolidation accurately.

Abstract:In order to identify the slaking characteristics of mudstone in different pH solutions and provide some theoretical basis and technical guidance for utilization of mudstone in areas polluted by acid rain,some laboratory tests of slaking were performed on mudstone from the open-pit mine of Haizhou in Fuxin. The slaking phenomena in different pH solutions and changes in grain contents and slaking ratio of mudstone samples in slaking process were analyzed. Through X-ray diffractometer(XRD)and fluorescence spectrum analysis system，the mineral & chemical composition of mudstone were made clear. The test results showed that the rank of these samples as slaking degree was acid>alkali>neutral. With an increase in the number of cycles，the slaking degree decreased while the slaking rate increased at first two cycle，and then it gradually slowed down. The slaking of mudstone in the acid solutions was the most severe. The fundamental reason was that most of the mineral composition of mudstone could not dissolve in water but chemical reaction between it and acid solutions produced soluble salts. It was significant to take into account the acidity of mudstone's surroundings in engineering construction.

Abstract:Analytical solutions of vertical dynamic impedance and velocity response at pile cap for vibration of friction pile in saturated viscoelastic half-space foundation were obtained and verified by considering plain strain model and mixed boundary condition of pile-soil interface as well as effect of excitation frequency based on Boer's porous medium theory for a deeper comprehension of its vertical vibration characteristics. Furthermore，effects of pile depth ratio and permeability coefficient on vertical dynamic impedance and velocity response at pile cap were discussed by parametric comparative analyses. The solutions and results of vertical dynamic impedance and velocity response at pile cap derived diversified the theories of pile dynamics and provided technical references and theoretical support for related engineering practice.

Abstract:Under Fire conditions， the interface thermal resistance between steel and concrete has important influence on structure temperature field. TheINSTRON 8874 material testing machine for high temperature thermal contact resistance testing device was used to conduct the thermal contact resistance experiments of steel and concrete interface. According to the time history curve of each measuring point's temperature，the interface temperature near steel and near concrete was obtained using the polynomial fitting and extrapolation method. The interface thermal contact resistance was calculated by heat conduction equation and definition of thermal contact resistance. The test results showed that under different interface pressure，the thermal contact resistance value was constant and comparatively consistent with the literature; Without interface pressure，the thermal contact resistance value was unstable and varied obviously with temperature.

Abstract:Based on the impact of detecting condition on testing data,the self-balanced "exact conversion method" was improved. And friction pile displacement coordinate conversion method and loads coordinate transformation method of rock-socketed piles were proposed. The results illustrated that the practical application of the two conversion methods were reasonable and Mekong Bridge pile foundation met the design requirements. Analyzing the lateral friction and end bearing force distribution of tested pile,the results show that,similar to friction piles,the main vertical bearing capacity of rock-socketed piles were the main lateral friction in the Mekong Bridge.

Abstract:Pile geothermal heat exchanger is characterized by bigger pile diameter and shallow buried depth，and current studies presented the analytical solution models only considering soil conduction ignoring the thermal property difference between grout and soil which would induce the calculation error for big pile diameter. A conduction numerical solution model considering the thermal property difference was developed to analyze the heat transfer influence of pile geothermal heat exchanger induced by thermal parameter difference. Results showed that conductivity difference had little impact on the heat transfer when the operation time was long and the difference of specific heat would induce big error of the ground heat exchanger design capacity and the bigger the pile diameter was，the more obvious the calculation error.

Abstract:In order to study the fire resistance of restrained high strength Q460 steel beam，the residual stresses were introduced to analyze the fire resistance of restrained steel beam. The method was validated by experiment conductedon restrained mild steel beams. Fire resistance of restrained high strength Q460 steel beams was analyzed and compared with that of restrained mild Q345 steel beams and parameters affecting the fire resistance of restrained high strength Q460 steel beams were studied The parameters included load ratio，residual stress，stiffness of axial restraint，stiffness of rotational restraint and fire exposure mode. The results showed that the innovative method proposedwas accurate and reliable; the fire resistance of restrained high strength Q460 steel beam was much better than mild steel beam and the former. Load ratio，stiffness of axial restraint，stiffness of rotational restraint and fire exposure mode had significant influence on fire resistance of restrained Q460 steel beam.

Abstract:In order to investigate the influence of saturation on mechanical properties and longitudinal wave velocity of karst limestone，the experiment to on the mechanical property and the elastic wave velocity of karst limestone under natural and saturated condition was conducted. The results are as follows: Saturation has a significant influence on the softening of uniaxial compressive strength，tensile strength and elastic modulus of karst limestone，and peak strain and poisson's ratio of saturated sample are larger than corresponding values of natural specimen on the whole.The longitudinal wave velocity of water-saturated sample is significantly higher than that under natural condition，and the uniaxial compressive strength and tensile strength of specimen under two condition have a significant linear relationship with elastic wave velocity. Based on the current studies，he results are used to assess the stability of rock pillar between tunnel and concealed karst cave with high pressurized water，and calculate the minimum anti-inrush thickness.

Abstract:The flexural toughness of hybrid fiber reinforced shotcrete was studied with hybrid fiber including different contents of steel fiber，polypropylene fiber and blast furnace powder super composite were used to reinforce in cemetition matrix. 600 mm×600 mm×100 mm hybrid fiber reinforced shotcrete panels were adopted and placed on the rigid support frame and the equal displacement was used to control the load on the center of panels. The load-deflection curves and the energy absorption value were used to comprehensively evaluate the flexural toughness of each group，and by analyzing the process of the panels failure the ability of the panels to limit the cracks could be assessed. The results showed that,the jet panels with 0.8% steel fiber and 0.11% polypropylene fiber showed better flexural toughness than the jet panels with 1.2% steel fiber and 0.11% polypropylene fiber，and the peak load increased by 18% and the energy absorption increased by 25.6% when the the deflection was 25 mm.When jet panels with 0.8% steel fiber mixed with 0.11% polypropylene fiber，the energy absorption increased by 28.5% because of the positive synergy effect of steel and polypropylene fiber. The flexural toughness of hybrid fiber reinforced shotcrete panels were reinforced and toughed with more blast furnace powder. All of the hybrid fiber reinforced shotcrete panels showed great ability to limit the cracks，and the whole of panels where the cracks appeared but not ran through presented ductile failure.

Abstract:The real time scanning observation on meso damage process in concrete was carried out using CT technology. CT images of crack propagation，coalescence and failure were obtained under static and dynamic tension. Meso-damage mechanism of concrete under tension was analyzed the mean CT numbers in large statistical region small statistic region of scanning layers ROI.The results showed that the cracks developed in the interface of weak region and expanded to adjacent weak partsthe mean CT numbers of the two statistical regions showed decreasing trend. Parts of aggregates were ruptured when the concrete was damaged under static tension. While in small statistic region，the cracks developed in the interface of weak region and expanded along the fastest path，and the mean CT numbers showed a decreasing trend The mean CT numbers in large statistical region changed slightly. The aggregate divorced from mortar along interface，and the failure plane was smoother when the concrete was damaged under dynamic tension. So，the aggregate was ruptured obviously because the loading rate was higher.

Abstract:On the basis of the energy conservation principle between internal and external work，failure mode of shallow tunnel under inclined ground was established and the expression of surrounding rock pressure was drawn using the limit analysis upper bound method.The correlation factors was analyzed by the computation examples. This results showed that due to the conservative design on Terzaghi limiting equilibrium method of rock support system in tunnelling，the limit analysis method without considering floor lift is medium，while considering floor lift had the greatest risk.The increase in inclination angle of slope surface had adverse effect on the shallow tunnel stability and the surrounding rock pressure increased with the reduce of geotechnical lateral pressure coefficient，or the increase of the buried depth and tunnel diameterLarger geotechnical cohesion force and friction angle were beneficial to improve the tunnel stability.

Abstract:By adopting double shear test，the developing law of interface bonding properties between CFRP and high performance concrete exposed to freeze-thaw environment was studied. The damage characteristics，shear strain distribution，the paths of the load-slip curves，adhesive capacity and failure mechanisms of specimens without freeze-thaw damage and with 25，50，100，150，200 and 300 times freeze-thaw cycle effect were compared and analyzed. The results showed that interface damage occurred within the concrete surface layer for all of the specimens，but with the increase of freeze-thaw cycles，destroyed interface had the tendency to the adhesive resins layer. Subjected to less freeze-thaw cycles such as 25 times and 50 times，the interface bond strength，rigidity and cracking load didnot change obviously，even slightly elevated but with the further increase of freeze-thaw cycles，interface bond properties changed obviously. Interfacial bond strength and slippage in the end of CFRP decreasedThe rigidity degeneration and nonlinear characteristics were obvious andthe initial cracking load was lowered. The ultimate bearing capacity and the concrete cube compressive strength both declined after increasing with the growth of the number of freeze-thaw cycles. The change of concrete strength was an important factor for the changes of interfacial bond properties.

Abstract:The function of void radio e changing with current stress was derived using the theory of Modified Cam-Clay Model. Simultaneously，four groups of classic estimate formula about permeability coefficient changing with void radio were compared to identify the accurate one. User subroutines VOIDRI and USDFLD in ABAQUS were compiled to realize the variation of void radio and permeability coefficient along with the change of current stress of soil. Then the soil displacement，the deformation and the bending moment of retaining structure caused by excavation and dewatering with or without considering the change of void ratio and permeability coefficient with current stress of soil were compared. The results showed that i with changing void ratio,values of ground settlement horizontal displacement of diaphragm wall， bending moment of diaphragm wall and rebound at bottom were larger than those with constant void radio. When permeability coefficient changed with current stress of soil，values of ground settlement，horizontal displacement and bending moment of diaphragm wall were smaller than those with constant permeability coefficient however，the change of void radio and the permeability coefficient with the current stress has no significant impact on soil rebound at bottom.

Abstract:The solar radiation is an important fundamental meteorological parameter for building energy efficiency analysis. Since the measured radiation data can not meet the demand for analysis，the theoretical calculation is the critical. The widely used horizontal solar radiation models were classified into three categories including meteorological parameter model，spatial interpolation model，DEM solar model. Principles and calculation methods of three type model were presented. The applicability of three models in building energy efficiency field was analyzed. The future of solar radiation for building energy efficiency analysis was predicted.

Abstract:Green roof contributes to high total thermal resistance of roof serving as additional equivalent thermal resistance ，which effectively reduces the heat gain from roof and lowers the indoor air temperature. However，current studies showed that the relationship of indoor temperature and thermal performance was coupling and the performance of the green roof are different with the change of the indoor temperature. Surface temperature and heat flux changes of green roof，reference roof and equivalent insulating roof were analyzed respectively when the indoor temperature changed using both experiment and numerical simulation. The results showed that the indoor temperature had significant impact on the insulation performance of green roof and the equivalent thermal resistance had positive correlationwith the indoor temperature. The insultation performance of green roof reduces heat gain in passive building.Key words:green roof;equivalent thermal resistance; numerical simulation.

Abstract:The influence of specific surface area on cementitious reactivity of phosphorous slag power(PS)was studied and the grey relation degree and relation polarity between the particle size distribution characteristics and the activity coefficients of PS were investigated. The results indicated that particles could weaken the hydration activity of PS and when particle size is greater than 30.2 μm and enhance that when smaller than 30.2 μm. The volume fraction of particles with size of 5.0~10.0 μm and 10.0~20.0 μm are important determinant of the early activity index(i.e. A7)and activity index A28，respectively. Therefore，specific surface area should be greater than 397 m 2·kg -1 to improve the hydration activity of PS and it is important to increase the content of particles with size of 5.0~30.2 μm，especially with size of 5.0~20.0 μm and decreasethat of particles bigger than 30.2 μm.

Abstract:The porosity and intrinsic permeability of the cement-based materials are significant parameters for the multiphysics coupling model for predicting the ions migration in the material. Based on the mass control equation, the super subcritical carbonation model of cement-based material，the liquid permeability，gas permeability and intrinsic permeability were detected by the steady-state method，and the porosity and water saturation were detected by the volumetric method using materials of mortar，concrete，cement tile and two kind cement slabs. The results showed that the orders of magnitude of intrinsic permeability of mortar and concrete were 0.001mD and 0.0001mD respectively，and the others were 0.01mD. Especially，the concrete intrinsic permeability was 9e-4mD and the porosity and the permeability would increase，when the material hadwood fiber component. Finally，some super subcritical carbonation tests were simulated using the values of the parameters obtained，and it was consistent with the test results of the carbonization depth.