钢-混凝土混合结构振动台试验的弹塑性损伤分析  

Elasto-plastic damage analysis of shaking table test results of steel-concrete composite structure

作　　者：李忠献[1] 吕杨[1] 徐龙河[2] 丁阳[1] 

机构地区：[1]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《建筑结构学报》2012年第10期15-21,共7页Journal of Building Structures

基　　金：国家自然科学基金重大研究计划项目(90815025);国家自然科学基金面上项目(51178034);天津市应用基础与前沿技术研究计划重点项目(09JCZDJC25200)

摘　　要：通过LS-DYNA程序,二次开发了钢材和混凝土单轴弹塑性损伤本构模型,其中钢材损伤模型采用混合强化准则,可考虑材料的Bauschinger效应;混凝土损伤模型定义了拉、压两个损伤指数,能较为准确地模拟混凝土单边效应、箍筋约束效应等。结合程序中基于显示算法的纤维单元,建立了结构整体数值分析模型,并通过一个缩尺比例为1∶4的3层钢-混凝土混合结构模型振动台试验,验证了数值分析模型的分析精度,数值模拟得到了模型结构的损伤发展过程。此外提出一种通过实测应变反演应变测试部位材料的应力和损伤发展的方法,研究表明,应变反演能充分利用应变测试数据,获得材料应力和损伤发展过程,并对结构的性能退化进行评估。Through the secondary development of LS-DYNA program, the uniaxial elasto-plastic damage constitutive models of steel and concrete were developed respectively. The mixed-hardening criterion was used and the Bauschinger effect was considered in the steel damage model. Two damage indices were defined in the concrete damage model so that both the unilateral effect and the confinement effect of concrete ean be accurately simulated. Combined with the explicit algorithm based fiber element model, the method of building integral structure model for numerical analysis was proposed. The precision of this method was validated by the shaking table test of a 1/4-sealed model of a 3-story steel- concrete composite structure. Then, the damage evolution process of the test structure model was reproduced using the proposed numerical analysis model. Furthermore, an inverse calculation method for obtaining the stress and damage evolution process at a local area of the structure from the strain data measured at the same location was developed. The results show that this inversion method fully uses the measured strain data to get the structural stress and damage evolution process, and can make more accurate estimate for the performance degeneration process of structures.

关 键 词：钢-混凝土混合结构 振动台试验 损伤本构模型 应变反演 弹塑性损伤分析 

分 类 号：TU973.14[建筑科学—结构工程] TU317.1