防屈曲耗能支撑在轻钢加层结构中的应用

The Application of Buckling-restrained Brace in the Light-weight Steel Storey-adding Structure

采用SAP2000建立某幢办公楼结构加层前后的有限元模型,并对其进行了反应谱分析、Pushover分析和非线性时程分析。结果表明,加层后结构自振周期、层间位移明显增大,扭转效应变强,部分参数超过规范限值。根据结构特点,提出了两种设置防屈曲耗能支撑的方案,用振型分解反应谱法分析两种方案,结果表明都能满足要求;最后对这两种布置方案的整体结构进行罕遇地震作用下的时程分析。通过优化,发现有一种方案是较为合理的,能满足相关设计规范对结构的要求,体现了防屈曲耗能支撑设置位置的选择对结构的抗震性能起重要作用,可为同类工程提供设计参考。

In this paper,the finite element model of an office building was established by SAP2000,and its reaction spectrum analysis,Pushover analysis and nonlinear time-history analysis were carried out.The results show that the structure natural vibration period and inter-layer displacement are significantly increased,the torsion effect is stronger,and some parameters exceed the limit value.Then,according to the characteristics of the structure,two schemes to set up the buckling-restrained brace support are proposed,and the two schemes are analyzed using the mode decomposition,and the results show that they can satisfy the requirements.The whole structure of these two layout schemes is analyzed under rare earthquake the optimization,found that there is a kind of scheme is reasonable,and can satisfy the structural design specification requirements,and it shows that the selection of the position of the buckling-restrained brace consumption can play an important role in the seismic performance of the structure,can provide design reference for similar projects.