考虑填充墙刚度影响的实测高层建筑非线性抗震性能分析

Nonlinear seismic performance analysis of on-site tested high-rise buildings to consider the impact of infilled wall stiffness

以广西来宾高层建筑测试项目中的一栋剪力墙结构为研究对象,在对其进行环境振动测试的基础上,依据现场实测模态数据对建立的结构有限元模型进行参数修正,评估结构的抗震性能.在Perform-3D中建立该高层结构的初始有限元模型,采用与PKPM设计模型相同的处理方式研究填充墙的影响,结构的模态周期计算结果表明,两类模型具有较好的可比性.通过在Perform-3D模型中添加斜撑单元对填充墙进行模拟,利用现场实测数据对斜撑单元的特征参数进行修正.对考虑和未考虑填充墙刚度影响的结构有限元模型分别进行了增量动力分析,评估潜在危险性水平地震作用下结构的整体抗震性能.结果表明,初始模型的最大层间位移角和顶层位移约为校验模型的1.1~1.4倍,最大基底剪力是校验模型的40%?60%.

Based on the on-site random vibration test for the high-rise buildings in Laibin,Guangxi Province,the finite element(FE)model of a high-rise shear wall stmcture was built in Perfonn-3D to conduct a seismic behavior research,and the corresponding parameters of the analytical model was corrected by the modal information on high-rise buildings obtained from on-site vibration tests.A primary model of high-rise buildings was built by Perfom-3D where the non-stmctural component as infilled wall was treated with the same modeling strategy as that of PKPM.The calculation result of modal periods suggested a good comparability between the two models.The diagonal bracing element calibrated by the measured records was added to simulate the behavior of an infilled wall.The incremental dynamic analyses were conducted in the primary and calibrated structure FE model to evaluate the influence of the infilled stiffness to structural performance under the potential hazardous seismic actions.The results revealed that the maximum inter-story drift and the roof displacement of the primary FE model were approximately 1.1-1.4 times larger than the calibrated FE model,while the maximum base shear was 40%-60% less contrarily.