处于双轴拉压的普通混凝土力学性能试验研究  

The Experimental Investigation of Normal Concrete Mechanical Property under Biaxial Tensional and Compressive Stresses

作　　者：姚家伟[1] 宋玉普[2] 

机构地区：[1]大连民族学院土木建筑工程学院,辽宁大连116600 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《建筑科学》2011年第5期32-35,共4页Building Science

基　　金：国家自然科学基金资助项目(50679007);国家建设部科研基金项目(04-02-155);辽宁省教育厅高等学校科学研究项目(20060144);大连理工大学海岸和近海工程国家重点实验室开放基金(LP1002);中央高校基本科研业务专项资金资助项目(DC10020120)

摘　　要：实际工程中的混凝土结构大多处于复杂应力状态,本文利用大连理工大学海岸和近海工程国家重点实验室的大型混凝土静、动三轴试验系统,对普通混凝土进行了0(单压)、-0.05、-0.1、-0.15、-0.2、-0.25、∞(单拉)七种比例加载路径的双轴拉压试验,测得了混凝土的抗压强度和抗拉强度,及两个加载方向的应变,并根据试验结果,系统地探讨了混凝土在不同拉压比下的双轴拉压强度和变形特性,发现拉压比对普通混凝土强度和变形性能有明显的影响。建立了考虑拉压比的普通混凝土双轴拉压的破坏准则,与试验值符合较好。经分析得出结论:实际工程中处于双轴拉压应力状态混凝土结构的承载能力低于单轴应力状态的混凝土结构。本文的试验数据及理论分析,丰富了混凝土的多轴强度理论。Most concrete structures are in complex stress state.In this paper,biaxial concrete tension-compression tests of 7 different stress ratios 0,-0.05,-0.1,-0.15,-0.2,-0.25,∞ were completed respectively,using the concrete static-dynamic triaxial test system in the State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology.The compressive strength,tensile strength and two loading direction strains of concrete were measured.According to the experimental results,it is found that the effect of tension-compression stress ratios on strength and deformation of normal concrete is significant.Considering the tension-compression stress ratios,failure criterion of normal concrete under biaxial tension-compression is established.The study results show that in actual engineering,the carrying capacity of concrete structure under biaxial tension-compression is inferior to that under uniaxial stress.The experimental data and theoretical analysis of this paper enrich the multiracial strength theory of concrete.

关 键 词：普通混凝土 双轴拉压 力学性能 试验研究 

分 类 号：TU528.1[建筑科学—建筑技术科学] TU502.6