考虑墙-框连接刚度影响的填充墙框架结构抗震性能分析

Seismic Performance of Frame Structures with Infilled WallsConsidering the Effect of Wall-Frame Connection Stiffness

摘要:

历史震害表明，填充墙与框架的连接刚度对框架结构的抗震性能有重要影响。我国《建筑抗震设计规范》（2010）建议“框架结构中的砌体填充墙，宜与柱脱开或采用柔性连接”，但对二者的具体连接刚度，规范并没有做出明确规定。运用ABAQUS软件，对前人开展的考虑填充墙与框架连接影响的框架结构拟静力试验进行数值模拟，对比分析填充墙框架结构破坏特征及滞回曲线等抗震性能指标，验证了有限元模型的可靠性。基于某典型框架结构，建立不考虑填充墙、考虑填充墙与框架不同连接刚度的框架结构有限元模型。模态分析表明，连接刚度对框架结构的频率影响较小，结构的动力特性趋于一致；多遇地震和罕遇地震作用下的弹塑性时程分析表明，合适的连接刚度可以提高结构的抗震性能。研究可为框架结构的抗震设计提供参考。

Abstract:

Historical earthquake damage shows that the connection stiffness of infilled walls and frames exerts an important influence on the seismic performance of frame structures. Code for Seismic Design of Buildings (2010) suggests that infilled walls should be separate from or connected flexibly to columns but does not provide the appropriate connection stiffness between these structures. In this work, pseudo-static tests on frame structures considering the effect of connection stiffness between infilled walls and frames were numerically simulated by using ABAQUS. Then, based on a typical frame structure, finite element models that do not consider infilled walls but consider different levels of connection stiffness between infilled walls and frames were established. The failure features and hysteretic curves of frame structures with infilled walls were compared with those without, and the reliability of the finite element models was verified. Modal analysis indicated that connection stiffness exerts a small influence on the frequency of the structure and that the structures showed the same dynamic properties. By analyzing the elastic-plastic time histories of the structures under frequent and rare earthquakes, the appropriate connection stiffness was confirmed to improve the seismic performance of the structures of interest. This paper provides a reference for the seismic design of frame structures.