平面应变混凝土强度变形试验与等效单轴应变本构模型  

Strength-deformation test and equivalent uniaxial constitutive model of concrete in plane strain

作　　者：汪基伟[1] 陈玉泉[1] 

机构地区：[1]河海大学土木工程学院,南京210098

出　　处：《东南大学学报（自然科学版）》2005年第5期775-779,共5页Journal of Southeast University：Natural Science Edition

基　　金：教育部骨干教师资助计划资助项目([2000]65)

摘　　要：利用自行研制的三向强度变形试验装置,进行了应力比α=σ1/σ3=0∶-1,0.05∶-1,0.1∶-1,0.2∶-1和0.3∶-1的拉压平面应变状态强度与变形试验.试验结果表明:在拉压平面应变状态时,混凝土破坏形态主要分为受拉和受压2种,应力比α=σ1/σ3≤-0.1时为受拉破坏,应力比α>-0.1时为受压破坏;在混凝土开裂或屈服前,应力应变关系呈线性.同时,根据试验结果给出了拉压平面应变状态的强度计算公式,完善了平面应变状态等效单轴应变本构模型.Tests of concrete in tension-compression plane strain are carried out using the apparatus for multi-axial performance of concrete designed by the authors. The stress-strain curves are obtained with the stress ratios α=σ1/σ3=0：-1,0.05：-1,0.1：-1,0.2：-1,0.3：-1 From the experimental results, it can be concluded that the failure modes of concrete can be classified into two categories： compression failure when α〉 -0. 1, and tension failure when α≤0. 1. The stressstrain relation is approximately linear before cracking or yielding of the concrete. Meanwhile, according to experimental results a strength formula for concrete in tension-compression plane strain is presented, so that the equivalent uniaxial constitutive model of concrete in plane strain is improved.

关 键 词：混凝土 平面应变状态 强度变形试验 本构模型 等效单轴应变 

分 类 号：TU502[建筑科学—建筑技术科学]