强震作用下构件损伤对钢框架结构受力性能的影响  

Effect of damage on steel frame mechanical behavior under severe earthquake

作　　者：王萌[1] 石永久[1] 王元清[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2012年第10期94-101,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51038006)

摘　　要：为研究强震作用下结构发生局部屈曲造成损伤对钢框架结构抗震性能的影响,采用通用有限元软件ABAQUS,分别建立杆系模型以及三维精细钢框架模型,比较了是否考虑累积损伤抗震指标的差异。应用国内外典型试验结果,验证了三维精细模型对模拟局部屈曲累积损伤现象的准确性及适用性。在此基础上,建立杆系和三维精细壳单元有限元模型,分别进行拟静力加载以及罕遇地震作用下的弹塑性时程分析,对比了结构变形、滞回耗能、破坏形态等方面的特征。研究结果表明:加载初期,杆系模型和三维精细壳单元模型计算结果基本一致;随着结构损伤累积,两者出现明显的差别,杆系模型会低估结构的变形大小以及塑性发展程度。In order to study the effect of damage caused by local buckling on the seismic behavior of steel frames under severe earthquakes, beam element model and fine shell element model were respectively established by ABAQUS. The differences caused by damage of two models were compared. Shell element model was proved correct and applicable comparing with typical quasi-static tests, which was considered to accurately describe the degraded behavior. Base on this confirmation, beam element model and shell element model were performed for quasistatic and nonlinear time history analysis. The characteristics of structural deformation, hysteresis energy and failure modes were compared. The results show that ： before the occurrence of damage and degradation, seismic indices calculated by the two models are in accordance. However, once local buckling causes damage, the results of the two models are remarkably different. Beam element model underestimated the structural deformation and plasticity development level.

关 键 词：钢框架 损伤退化 局部屈曲 弹塑性时程分析 有限元分析 受力性能 

分 类 号：TU391.02[建筑科学—结构工程]