防屈曲支撑在某钢框架结构加固设计中的应用

Research of the Buckling Restrained Brace in Retrofitting Design of a Steel Framework

采用防屈曲支撑对某钢框架结构进行抗震加固,对加固后结构的抗震性能进行了研究。采用弹性分析和弹塑性时程分析得到结构在多遇和罕遇地震下的反应。对比了加固前、后结构的侧向位移、层间位移角及塑性铰发展情况。讨论了防屈曲支撑的滞回特性,介绍了构件和节点的加固设计方法。分析结果表明对钢框架结构增设防屈曲支撑可以有效地减小结构地震反应,提高结构的抗震性能,减少加固工作量及大震后的修复工作。为类似的钢框架结构抗震加固工程提供参考。

The anti-seismic performance of a steel framework with buckling restrained brace in seismic retrofitting design is investigated.Elastic and elasto-plastic time-history analysis methods are adopted to get the performances of the framework under frequently occurred and severe earthquake,respectively. Statistics of displacement and performance of plastic hinge are compared between the two models of before and after retrofitting. Characteristic of hysteretic curve of brace is discussed. The retrofitting design methods of members and joints are introduced. The results of analysis indicate that seismic reactions can be minimized effectively by attaching the buckling restrained brace to the steel framework; seismic performance can be enhanced; workloads of retrofitting and repairing after severe earthquake can be reduced. This paper provides reference for similar engineering of retrofitting design for steel framework.