应变硬化水泥基复合材料单轴滞回本构模型  

Uniaxial cyclic constitutive model for strain hardening cementitious composites

作　　者：吴畅[1] 潘钻峰[2] 孟少平[1] 

机构地区：[1]东南大学土木工程学院,南京210096 [2]同济大学土木工程学院,上海200092

出　　处：《东南大学学报（自然科学版）》2015年第5期969-974,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金青年基金资助项目(51208093);教育部博士点基金资助项目(20120092120021)

摘　　要：为了有效地模拟应变硬化水泥基复合材料(SHCC)构件在地震作用下的性能,提出一种可模拟SHCC构件在反复荷载作用下的单轴本构模型.该模型中SHCC材料受压骨架曲线的上升段采用二次抛物线形式模拟,下降段采用双折线形式模拟;受拉骨架曲线的上升段、应变硬化段及下降段则采用三折线形式模拟.通过设置参考点的方法确定SHCC的卸载规则,考虑了不完全卸载-再加载的情况以及加载过程中的拉压间的传递模式.利用Open SEES计算平台编写了该本构模型,并与材料和构件2个层次的试验结果进行了对比,结果表明,所提出的单轴滞回模型能够准确地反映SHCC材料在反复荷载作用下的受力性能.For effectively simulating the seismic behavior of strain hardening cementitious composites （SHCC）members,a uniaxial cyclic constitutive model for SHCC was proposed.The ascending branch of the compressive envelop curve was imitated by using the form of parabolic curve;while the bilinear form was adopted for the descending branch.A trilinear form was used to imitate the ascending,strain-hardening and descending branches of tensile stress-strain curve.By the method of setting reference point,the rules of unloading process were determined in consideration of the partial unloading-reloading scheme.Furthermore,the transition between tension and compression was considered in the cyclic model.The proposed cyclic constitutive model was coded by OpenSEES soft-ware and applied to simulate the material and component tests.The simulation results indicate that the proposed model is reasonably accurate in simulating the mechanical properties of SHCC and the cyclic behavior of SHCC flexural element.

关 键 词：应变硬化水泥基复合材料 反复加载 单轴滞回本构模型 非线性有限元分析 

分 类 号：TU318.1[建筑科学—结构工程] TU528.58