混凝土偏应力循环拉-压加载的梨形双面模型  

Pear-Shaped Two-Surface Model of Concrete under Cyclic Tension-Compression Loading of Deviatoric Stress

作　　者：张静 温森[1] 周志勇[1] ZHANG Jing;WEN Sen;ZHOU Zhiyong(School of Civil Engineering and Architecture,He′nan University,Kaifeng,China,475001)

机构地区：[1]河南大学土木建筑学院,河南开封475001

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第2期227-235,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52005155);河南省科技发展计划项目(192102310014)。

摘　　要：目的研究混凝土在复杂三轴循环载荷下的动力本构模型,为探求混凝土结构在复杂荷载作用下的累积变形与破坏规律提供基础理论。方法在梨形边界面模型的框架下,针对混凝土在应力偏平面上的三轴拉-压加载情况,提出一个细化模型。该模型包含一个加载面和一个形状相似的边界面,采用非相关流动法则,通过加载面和边界面在应力空间的演化来描述混凝土在加卸载作用下的循环塑性、损伤、变形累积的特性。结果运用模型对混凝土试块在偏平面上的两种循环加载情况—沿着拉伸-压缩方向以及仅沿着压缩方向的试验结果进行了预测,得到的广义剪应变-平均应变关系曲线和应力-应变关系曲线与试验曲线的变化规律相同。结论该模型模拟的应力-应变曲线比较合理,能够反映滞回曲线形状和面积的变化情况,能够描述应力-应变曲线的上升-下降段,能够表现出混凝土的剪胀特性。The dynamic constitutive model of concrete under complex triaxial cyclic load is studied,which provides a basic theory for exploring the cumulative deformation and failure law of concrete structure under complex loads.In the framework of the pear-shaped bounding surface model,a refined model was given for the triaxial tension-compression loading of concrete in the stress deviatoric plane.The model includes a loading surface and a similarly shaped bounding surface.Using the non-associated flow rule,the cyclic plasticity,damage characteristics and accumulated deformation of concrete under loading-unloading were described through the evolution of loading surface and bounding surface in the stress space.By using the model to simulate the loading data,the test results which are belong to two cyclic loading conditions of concrete in the deviatoric plane—along the tension-compression direction and only along the compression direction were predicted.And the generalized shear strain-average strain curves and the stress-strain curves were obtained,which have the same variation law as the test results.The model can simulate the reasonable stress-strain curves,can reflect the changes of shape and area of the hysteretic curves,can describe the increasing-decreasing stage of the stress-strain curves,and can show the dilatancy characteristics of concrete.

关 键 词：边界面模型 偏平面 循环加载 拉伸-压缩 剪胀 

分 类 号：TU528.1[建筑科学—建筑技术科学]