LIN Cong-hua , ZHANG Xing-guo , HUANG Dong-hai , TANG Chun-yuan
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.001
Abstract:In this paper,we provide a full description of the four extant Buddhist constructions in central Sichuan Province,P.R.China: the grotto,shrine,eaves and cliffside.The work is based on field investigation of the Bashu cliffside carvings and analysis of historical documents.We point out that the Bashu cliffside carvings construction bears witness to Buddhist construction and culture in central Sichuan in different historical periods.They demonstrate that the nationalism and regionalism of such construction enriches the regional architectural connotations which play a referent role in modern architectural creation.
ZHANG Heng-kun , TANG Ming-fang , ZHAO Wan-min
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.002
Abstract:In this paper,we summarize outdoor sun-shading forms in public spaces and compare the shading effects of several shading measures.Then,taking a public square in the city of Chongqing,P.R.China as an example,we analyze thermal environmental designs with full application of various sun-shading forms so as to give a reference for the design of future urban public spaces and the reconstruction of existing urban public spaces.
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.003
Abstract:Expect to satisfy basic visual task,the chief purpose of lighting in commercial pedestrian streets is to create more comfortable,more active and interesting environment.This paper analyzes main characteristics of visual perception,such as the attributive stage,expectations of perception and final response to the environment,and tries to discuss object and demand of lighting in commercial pedestrian street based on principles of visual perception.In this paper,first,frame of reference about visual perception is presented;then,the cause of lighting environment design is put forward;finally,some elements of lighting design in commercial pedestrian streets are ascertained.
LI Ze-xin , NIE Xiao-qing , YANG Tao
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.004
Abstract:There is a promising future for lateral aviation in the Three Gorges Reservoir Area of the Yangtze River because of the abundant natural and cultural tourism resources.The advantage of the lateral aviation is its low investment,convenience,speed,and wide service area.It is an important factor for the future development of tourism in cities in this area.This paper analyzes the realities and problems facing lateral aviation in this area and suggests some countermeasures and planning suggestions for lateral aviation development.
FU Jian-ping , WANG Jin-lin , BAI Shao-liang
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.005
Abstract:There are numerous shear walls with flanges in the high-rise buildings in P.R.China.The shear strength formula for shear walls in Chinese design codes lacks experimental data,while test results in other nations lack aseismatic shear strength test results for shear walls with flanges under axial force.In this paper,we report low-cyclic reverse load test results of shear wall models with large dimensions,one shear wall having an I-shaped cross-section and two with a T-shaped cross-section.We discuss why the aseismatic shear walls of high-rise buildings with large height-to-length ratios have small shear span ratios.We assess the reliability of the shear strength formulary in the Chinese codes for design of shear wall using the international shear wall test results.
DONG Yu-wen , REN Qing-wen , YU Tian-tang
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.006
Abstract:The extended finite element method(XFEM) presented in recent years is a new and effective method for discontinuity analysis,especially fracture problem analyses.The basic XFEM principle is introduced and the technique for fracture analysis is presented.The fracturing process of a gravity dam is simulated by XFEM,and the rules of stresses and displacements distribution are analyzed.Compared with the classical finite element method,the crack growth in the gravity dam can be modeled by XFEM without making the crack surface associate with the finite element mesh and setting dense mesh near the crack tip as well as remeshing after crack growth.The cumbersome work and disadvantages in conducting fracturing analysis by the finite element method thus can be avoided.The predominance of this method for dam fracturing analysis is displayed.
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.007
Abstract:During the long history of architectural development,ancient Chinese architects applied the geomantic philosophy to architectural design.Geomantic philosophy is of great value to modern architectural design.in order to make the geomantic thought popular in modern architectural design,traditional geomantic culture was embodied very well in the design and site-selection of the tomb of Yang Shangkun,former President of P.R.China.The idea of geomancy in the tomb design also provides a rich and valuable experience for modern architectural design.The tomb is an example of inherited Chinese traditional culture and application of ancient thought to contemporary uses.
LU Lin-feng , DONG Liu-fang , ZHOU Xu-hong
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.008
Abstract:The FEM simulation analysis method was studied to identify the ultimate bearing capacity of cold-formed steel portal frames.In this study,the beam-spring system was used to simulate the performance of joints.The initial imperfection of frame components was considered.The deformation performance and failure features of portal frame structures under vertical loads also were studied.The analytic results of the FEM simulation analysis method are close to the values obtained by experimentation.The ultimate bearing capacity of portal frames were computed by changing parameters such as the web plate thickness,the flange width,the plate thickness of brackets,the portal frame roof inclination,and the column footing stiffness.The analytic results indicate that the ultimate bearing capacity may be improved when the parameters mentioned above are increased.
GAO Li-tang , LI Xiao-dong , CHEN Li-gang , DONG Yu-li
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.009
Abstract:Plastic strain was determined at multiple time increments.The strain was caused by stress and temperature.The yield function in high-temperature states is the function of temperature and plastic strain.The calculation efficiency would be decreased and much more calculation would be needed if a conventional method,such as the radial return method,was used.In the case of axial stress states,the temperature path was difficult to determine at various time intervals.Initial value equations were obtained with the Drucker-Prager function of plane stress concrete.This method can solve the previously mentioned problems efficiently when used with the Runge-Kutta integration strategy.A program was developed with an updated co-varying coordinate finite element method based on the S-R decomposition theorem.Computational results show that the integration strategy is highly accurate and efficient.
ZHAO Yu , LI Xiao-hong , LU Yi-Yu , KANG Yong
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.010
Abstract:陈垃圾土是一类非常特殊的土,结合重庆一封场六年多的填埋场,对陈垃圾土的物理指标,工程力学性质进行实验研究。总结了陈垃圾土的主要组成成分,得出了陈垃圾土的含水率,密度和孔隙比的具体范围,并与新鲜垃圾作了比较。探讨了垃圾各组分对土体各物理指标的影响。深入研究了陈垃圾土的三轴应力应变曲线特征,并把曲线划分了四个阶段,分析了各个阶段的特点,阐述了其产生的原因。指出陈垃圾土是具有一定的结构,但结构性很弱的土体,3σ是强度形成的主要原因。同时探讨了陈垃圾土有机物纤维,土体颗粒对陈垃圾的C,φ值影响。
BAO Tai , SHUI Yue , LIU Bao-shen , LIU Xin-rong
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.011
Abstract:Rock masses have defects,such as joints and fractures, which are the main seepage passages.Joints and fractures often are treated as parallel plates with the seepage state kept steady and the ground stress constant. When changes take place in joints and fractures as a result of stress changes induced by excavation,joints or fractures may be wedge-shaped,and the distribution of piezometric head along the fracture will be nonlinear.A distribution function of piezometric head is suggested and compared with the results of previous research.The influence of this function on the calculation of the slope safety factor is investigated.The study shows that this function is reasonable.
ZHOU Hai-bin , JIANG Ze-hui , FEI Ben-hua , REN Hai-qing
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.012
Abstract:Timber floors are by far the most common structural systems used in wood-framed residential buildings,and are the only systems with which human occupants are in constant physical contact.In dwellings,the floor vibration due to walking often brings discomfort to the occupants.Designing a house that controls the agonizing vibration of floors is a difficult problem.The vibration performance of five solid wood lumber joist floors was studied as were subjective opinions of evaluators.The 1KN static deflection and fundamental natural frequency were selected as two evaluation indexes of the vibration performance.The results show that when the ratio of the fundamental natural frequency to 1KN static deflection's 0.44 power is larger than 20,the solid wood lumber joist floor can be classiified as acceptable.
CHEN Xiao-Ying , WEI Feng , BAI Shao-liang
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.013
Abstract:Two 16-storey frame-wall structures with slender coupling beams in regions of Intensity 8(0.2 g),with and without considering the stiffness reduction of the coupling beams,were designed.Nonlinear dynamic response analyses of two typical frame-wall structures subjected to several ground motions were carried out.The analyses were based on the quasi-tridimensional program for nonlinear dynamic response analysis TS-EPA.The analyses led to the following conclusions: Under rare earthquake actions,the coupling beams in framewall structures yield first.This shows that the coupling beam in frame-wall structures is the member at the forefront of earthquake resistance.Comparison of the analytic results of two couples with and without considering the stiffness reduction of the coupling beam found that,in view of the dynamic response to and the requirement for ductility under rare earthquake motions,reducing stiffness causes a minor unfavorable influence on the dynamic response of frame-wall structures.
YAO Guo-wen , CHEN Sheng-hua , ZHOU Zhi-xiang
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.014
Abstract:Rotary hinges are temporary joints connecting arch ribs with the abutments of rigid frame arch bridges during the vertically downward rotating construction process.We probed the mechanical properties of a rotary hinge.Its stress distribution was simulated in contact FEM during the vertically downward rotating construction of a rigid frame arch bridge.The results show that nearly the entire structure of the rotary hinge is in a low-stress state with only a minor area in a high-stress state.By strengthening some local structures,rotary hinge construction security could be satisfied by its mechanical properties during vertically downward rotating construction.
ZHANG You-xiang , YANG Guang-hua , YAO Jie
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.015
Abstract:Combined with the design practice in foundation excavation engineering,the problems for combined supporting from inner supports and composite soil nailing wall under binary geological conditions,including soil layers and rock stratum with weak intercalation in range of excavation depth,are analyzed.These problems mainly include the following: calculation model of earthen pressure,the local bearing capacity of foundations below steel pipe piles,stiffness coordination at the junction of rigid and flexible supports,internal bracing stability influencd by restrained condition of upright post,etc.Problems of concern for design of similar foundation pit supports are pointed out,and measures for solving these problems are proposed.All these can provide references for similar projects.
YANG Le , WU De-lun , XU Nian-chun
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.016
Abstract:Conventional equivalent continuum theory poorly interprets the bending deformations and damage phenomena encountered in rock engineering because the theory ignores the influence of gradient stress.The influence of the bending effect on deformation characteristics of the media has been considered in Cosserat continuum theory which introduces the concepts of coupled stress and bending curvature.The basic principle of Cosserat medium theory and its expanded constitutive model were introduced firstly.Next,a numerical simulation of an underground cavern was carried out using FLAC software.After this,the results of the Cosserat model and explicit joint model were compared.The simulation results not only displayed the bending deformation of layered rock mass well,but also demonstrated the validity and superiority of the Cosserat expanded model.
XU Nian-chun , LIN Jun-zhi , WU De-lun
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.017
Abstract:Joints are crucial factors in rock masses engineering,so using stress waves to invert joint attitude is a valuable practice.The stress wave emitted from a vibration source is reflected by joints and returns to the ground.A formula to calculate the reflected wave travel time was deduced using analytic geometry theory.In the formula,a direct relationship was established between a joint's real dip angle,real dip direction and the travel time at test spots on the ground.The reflected wave's isotravel time circle described by the formula has a clear conception and a definite meaning.Using the program on the MATLAB platform,this formula can be applied to invert the joint attitude by searching the center of the circle based on the measured travel time at the testing spots around the wave source.
CAO Xin-ming , YANG Li-lie , ZHU Guo-liang
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.018
Abstract:Based on experimentthatal results,we conclude that confinement in regional confined concrete(RCC) columns is more efficient than that in normal confined concrete(NCC) columns.As loads increase,NCC column sections tend to become round;the corner concrete in the core area may break;and,the strains of external stirrups tend to drop slightly after the peak load.RCC columns,however,remained thoroughly rectangular and the stirrup strain increased steadily.The failure mode of RCC columns was totally different from that of NCC columns.While NCC columns tended to fail in shear,followed b a rapid drop in load carrying capacity,the RCC columns developed gaps in their midsections and the columns separated into several slender columns.After a long deformation period,the RCC columns retained approximately 40% of their load carrying capacity.It can be expected that this characteristic may benefit the anti-seismic capacity of structures.
ZHAO Ying , WANG Chun-yan , TAN Wan-fang
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.019
Abstract:The calculation of constant pressure values for relief valves in the fire suppression systems of high-rise buildings usually is based on the working pressure of pipe systems by experience.However,this method only is applied in the condition that the relief valves are installed on the effluent pipes of pumps.In order to confirm the proper constant pressure values of relief valves in fire suppression systems,a formula is deduced using hydraulics theory.The applications of the formula in fire suppression systems are also discussed.The constant pressure values for relief valves are directly related to three factors,namely,the flux and pressure of the fire pump,the located height of the relief valves,and the head loss of flux from the pump exit to the inlets of the relief valves.It is necessary to analyze the working condition of fire suppression systems and to be certain of the permissive pressure range for overpressure.
DONG Meng-neng , DING Xiao-you , JIANG Han , WU Bo , HE Dan
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.020
Abstract:How much contribution ratio of building energy efficiency for Chongqing in "11th Five-Year Plan" to the target of reducing 20% energy consumption per 10,000RMB GDP was the important problem to promoting building energy efficiency work.It has important significance to make target and measure of building energy efficiency.In this paper,the developing situation of building energy consumption,building energy consumption and energy-saving index for Chongqing in "11th Five-Year Plan" were analyzed and calculated through the statistics data published by statutory bodies and pre-setting work scenarios of energy efficiency for Chongqing in "11th Five-Year Plan".Calculating result confirmed that energy efficiency for Chongqing in "11th Five-Year Plan" payed 15.5% contribution ratio to the target of 20% less energy consumption per 10,000RMB GDP till 2010 compared to 2005.
NIE Hui-yuan , WU Yan-ju , WANG Yong , JIANG Pei-yan
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.021
Abstract:Based on the application characteristics of Surface Water Source Heat Pump System(WSHPs),the condition for the high efficient application of the system was expounded.Meanwhile,the distribution of water source in China Climatic Region was analyzed,and combining with the condition under which the surface water heat pump system was applied,the application feasibility of the system was explored.On the basis of the present climate division,the water source in the climate zone was analyzed comprehensively in terms of water temperature and water quality.Based on practical data,HVAC style,characteristic and condition of WSHPs,the adaptability analysis of the surface water heat pump system used in the climate zones was also given.
XIE Xiang-ming , YU Qing-shan , HU lei
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.022
Abstract:The shock and wearing resistances and anti-crack performance of concrete blended with polycarboxylate superplasticizer and polypropylene fiber were studied.Results show that,compared with concrete added with silica fume,the high water-reducing effect of polycarboxylate superplasticizer and fly ash reduced the consumption of cementitious material and the amount of cracks decreased significantly.Together with the action of polypropylene fiber,the shock and wearing resistances and anti-crack performance of concrete enhanced remarkably.
LIN Zhi , JIANG Shu-ping , XIE Feng
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.023
Abstract:With increased urban highway tunnel construction in P.R. China,there are more shallow cover tunnels passing under buildings.Finding a means to appraise buildings' degree of damage is one of the most important preconditions so that tunnels can safely pass under buildings.First,the instance of damage should be confirmed according to the buildings' actual settlement.Then, referring to the buildings damage evaluation criteria,the buildings' control damage rank and critical distortion value can be determined.The permissible distortion value can be drawn from the difference of buildings' critical distortion value and distortion value corresponding to its damage ranking.Finally,a three-stage appraisement is carried out to assess the degree of buildings' damage induced by tunnel construction.If every stage's calculated result of this appraisement exceeds buildings' permissible distortion value,the buildings should be reinforced to assure that the tunnels could pass through safely.At the same time, the calculation method has important reference value for the similar projects.
JIANG Shao-jie , TIAN Lin-li , YUE Chong-feng , XU La-mei
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.024
Abstract:The pattern of supplying water of differing quality using sewage recycling,and its implementation as a strategy,are discussed through an analysis of the water shortage situation in the city of Shenzhen,P.R.China. Supplying Shenzhen with water of varying quality is proposed as a concept.The necessity and feasibility of such a water supply pattern are expounded.The pattern of water supply in Shenzhen city consists of a main water supply system and non-potable water supply system with sewage recycling.In addition,the proposal also includes using seawater and rainwater.The non-potable water supply system with sewage recycling would be used primarily in large industrial parks outside the special economic zone and in other areas around the parks.Supplying Shenzhen with water of differing qualities embodies the concepts of sewage reused as a resource and of the recycling economy.This proposal also satisfies the requirement for urban sustainable development.
CHENG Li , HUANG Xu-quan , WANG Xiao-ping
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.025
Abstract:A set of installation is designed for electrochemical chloride extracting circularly on reinforced concrete.The removal efficiency is discussed using saturated Ca(OH)2 solution,saturated Ca(OH)2 0.001 mol/L Li2B4O7 solution and distilled water as electrolyte,respectively.And the microstructure of cement paste is analyzed by scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS).The results prove that using saturated Ca(OH)2 0.001 mol/L Li2B4O7 solution as electrolyte is more favorable to removing chloride in concrete.Treated by electrochemical desalination,the hydrated product C-S-H resolves and Ca(OH)2 in the concrete increases,too.It deposites on the wall of pores and fills in pores,and then causes the porosity to decrease,while the ratio of Ca /Si of C-S-H increases in the interface between the steel and the concrete.
LONG Tian-yu , LIU La-mei , LI Chong-ming , LI Ji-cheng
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.026
Abstract:Some reasonable and suitable methods for factor calculation of the equation were chosen based on the American Universal Soil Loss equation,the characteristics of the Jialing River basin in P.R.China,and related research results.The soil erosion and loss in each hydrological unit of the basin were estimated using GIS.Employing the non-point source adsorbed nutrition load model,the loads of adsorbed nitrogen and phosphorus pollution were calculated and analyzed.The results show that the average sediment transportation module in the Jialing River Basin in recent years is 161.94 t/(km2a),and the loads of adsorbed nitrogen and phosphorus pollution are 29 620.8 t/a and 1 391.96 t/a,respectively,at the watershed outlet(Beibei hydrologic station).Adsorbed nitrogen and phosphorus pollution are serious in the Bailong River and Xihanshui basins.The descending order of land type with adsorbed nitrogen and phosphorus loss modulus is as follows: wild land,bush,turf,field,city and forest.
LU Jun , LONG Ya-dong , WU Lian-xi , WANG Yong , DING Hao
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.027
Abstract:The air conditioning system using a ground source heat pump(GSHP) combined with a radiant floor integrates the advantages of both types,giving such a system large potential for popularization.After experimenting with one house's hybrid system,the design processes and construction methods for such a system can be summarized.In the experiment,different terminal devices were used to adopt varying winter and summer climatic conditions.It is suggested that the constructors should make good use of resources and waste water during the construction phase.The experimental results show that this hybrid system runs steadily and it supports a better temperature field to meet the requirement for the human comfort.Finally,a hybrid system managment strategy is suggested.
WANG Zhi , QIAN Jue-shi , ZHANG Zhao-hui , SHI Cong-li
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.028
Abstract:Porous concrete is an eco-concrete with high porosity and high strength,whose application was restricted to some extent,because there is lack of appropriate and unitive mixing design method.According to the features of porous concrete,proportion design idea of porous concrete whose major design parameter was porosity and strength was satisfied by changing variety of cementing material and aggregate size.The design method of porous concrete was that the raw materials were selected according to design requirement at first,secondly,aggregate dosage per unit volume of porous concrete was calculated,thirdly,dosage of cementing material was calculated by apparent density of aggregate and porosity of design requirement,finally,cement dosage of the unit physical volume and water dosage were calculated by water cement ratio deter mined by requirement of forming process.The test result indicated that this mixing design method of porous concrete was reliable and feasible.
LIANG Huai-qing , LI Shi-rong , WU De-hua
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.029
Abstract:Based on statistical data for Chongqing Municipality,P.R.China,and using ecological footprint theory,a dynamic calculation was carried out to determine the ecological footprint of Chongqing during the initial ten years that the area was under direct central government administration.The result indicates the following: the per capita ecological footprint in Chongqing increased gradually from 1.3767 49 hm2 in 1997 to 2.113 609 hm2 in 2006;the ecological capacity per capita decreased from 0.438 07 hm2 to 0.406 153 hm2;and the ecological deficit increased from 0.938 671 hm2 to 1.707 456 hm2.By 2010,it is forecasted that: the ecological footprint per capita will be 2.956 hm2;the ecological capacity per capita will be 0.385 1 hm2;and the ecological deficit will be 2.570 9 hm2.All these indicate that Chongqing is entirely in an ecological deficit state with the deficit increasing annually.The development mode of the city is an unsustainable one.In this paper,we summarize the calculated result,point out the reasons for ecological deficits in Chongqing,and conclude with some instructive advice for referral to the Chongqing government.
TANG Zu-quan , TONG Cheng-feng , QIAN Jue-shi , WANG Zhi
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.030
Abstract:The Seebeck effect of steel slag reinforced concrete was studied in this paper.The effect of steel slag content and curing period on Seebeck effect were focused on especially.The experimental results show that Seebeck effect of steel slag reinforced concrete was discovered,and a good linear relationship was observed between thermoelectric force(TEP)and temperature differential on the specimen;The linear relationship was from enhancing to weakening with increasing steel slag content;As the curing period extends,the Seebeck effect of steel slag reinforced concrete was better,and TEP became steady.
LU Wen-xiong , YANG Rui-hai , YU Shu-hua , ZHUANG Yan
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.031
Abstract:以多孔膨胀珍珠岩为载体,三乙醇胺、乙二醇、十二烷基苯磺酸钠和三聚磷酸钠为助磨剂复配了一种矿渣粉磨用多孔膨胀珍珠岩复合助磨剂,研究它对矿渣的助磨效果.将不同加入量的复合助磨剂在相同的粉磨条件下与矿渣共磨20~95 min,测定各矿渣粉的比表面积和45 μm筛余量,并与空白样品对比;然后对粉磨65 min所得的矿渣粉用图像分析仪和扫描电镜进行了形貌分析,用激光粒度分布仪进行了粒度分析;同时又研究了此复合助磨剂对矿渣-水泥体系标准稠度用水量、凝结时间、胶砂强度等各项性能的影响.结果表明:本试验的复合助磨剂的助磨效果好,对矿渣水泥的性能无损害且能够提高胶砂强度;矿渣的小磨试验中此复合助磨剂的最佳用量为矿渣质量的0.04%~0.08%,粉磨时间应大于35 min后矿渣粉中10~20 μm颗粒的含量相对空白明显增加.
2008, 30(3). DOI: 10.11835/j.issn.1674-4764.2008.03.032
Abstract:According to the research on whole curves of strain-stress of concrete materials,this paper finds there was an evident features of stages,and the discrete feature of curve is often in strain-softening stage.After data series of test being detected by dynamics of chaos,it presents that system of whole process of strain-stress evolutes from ordered steady state to low chaos state even high chaos state,system after compressive strength which curve of strain-stress is more linear one by one changes from strong ordered steady state to low chaos state;and joint system of concrete before compressive strength normally generates weak chaos state,with increase of uniaxial compressive strength of concrete materials specimens.The LE1 is proposed to be the stability criterion of concrete features in different stress stages,and the LE1 is regarded as the representative value of the system stability degree.The calculation of example shows that the stability criterion defined by the proposed method is consistent with the actual situation.
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