填充墙刚度影响的实测高层建筑增量动力分析

Incremental Dynamic Analysis of High-rise BuildingsConsidering the Influence of Infilled Wall Stiffness

摘要:

高层结构中的填充墙在地震作用下与周围结构构件之间的相互作用十分复杂，对建筑结构的整体抗震性能具有较大影响。然而我国规范在设计阶段通常不考虑填充墙对结构抗震性能的影响，统一采用周期折减系数来考虑其刚度变化引起的内力变化，因此准确评估填充墙对结构抗震性能的影响具有重要意义。本文在对一栋框—剪结构和一栋剪力墙高层建筑进行随机振动测试的基础上，利用Perform—3D对每栋高层分别建立了3种分析模型。其中对未考虑填充墙作用的结构模型，分别采取规范建议值和实测结果值两种方式进行周期折减。对通过添加斜撑单元来考虑填充墙作用的结构模型，利用环境激励测试识别获得的结构模态信息进行模型修正。对该3种模型进行了增量动力分析，探讨潜在危险性水平地震作用下填充墙对高层建筑抗震性能的影响。结果表明，填充墙增加了结构在弹性阶段的整体初始刚度，但随着地震动强度的增加逐渐丧失对结构刚度的贡献作用。相比考虑了填充墙作用的模型计算结果，规范建议的周期折减系数较为保守。同时研究发现，填充墙对高层框—剪结构的影响程度要比剪力墙结构大。

Abstract:

A complicated interaction exists between the infilled wall of high-rise buildings and the surrounding structural components under seismic action, and this interaction exerts a great influence on the seismic performance of the structure. Therefore, accurate evaluation of the influence of infilled walls on the seismic performance of structures is crucial. Based on the results of random vibration tests, three types of finite element models are built using Perform-3D for a high-rise frame-shear wall structure and a high-rise shear wall structure. For models that do not consider the infilled wall, the period reduction coefficient by the established specification is employed. Incremental dynamic analysis is implemented on the three models to discuss the influence of infilled walls on the seismic performance of a structure under the action of an earthquake with potential hazard. The calculated results reveal that the infilled wall can strengthen the initial stiffness of the structure in the elastic stage, but this contribution to decreases with increasing ground motion intensity. The period reduction coefficient suggested by the established specification is more conservative compared with the analysis results obtained from the proposed model considering the infilled wall. Findings also indicate that the influence of infilled walls on high-rise frame-shear wall structures is greater than that on shear wall structures.