钢框架正常使用极限状态考虑二阶效应的侧移性能研究

Research on the Deformation Performance of the Serviceability Limit State of Steel Frame Considering Second-order Effect

针对我国钢框架高等分析研究主要针对承载力极限状态的现状,分别采用传统一阶侧移计算方法、二阶简化侧移计算方法和二阶精确侧移计算方法对1榀2跨15层钢框架在正常使用极限状态时的侧移变形进行了计算,获得了钢框架在3种计算方法下的顶点侧移及层间侧移,并将获得的侧移计算结果进行了对比.研究了钢框架考虑二阶效应后对结构侧移变形的影响,探讨了钢框架考虑二阶效应影响后在正常使用极限状态下的侧移验算准则.结果表明:钢框架考虑二阶效应后,结构的侧移变形明显增加,其柱顶及层间侧移均比传统一阶分析结果增加很多,结构考虑二阶效应后,如仍采用我国现行钢结构设计规范中的侧移验算准则,将会显著增加结构用钢量.二阶简化侧移计算方法与二阶精确侧移计算方法相比,精度较高,可用于钢框架的二阶侧移计算.

Based on the fact that China＇s current research on the advanced analysis of steel frame focuses on capacity limit state, this paper uses traditional first order calculation method, second-order simplified calculation method and second-order accurate calculation method to calculate the lateral deformation of a 2-bay 15-story steel frame and obtains the peak drift and inter-story drift of the steel frame in the three methods. The drift results were compared, the study was carry out on the influence of the lateral deformation and the drift limit of steel frame under serviceability limit state when considering second-order effect. The results have shown that, for the steel frame considering second-order effect, the lateral deformation of the structure increased significantly, and the peak drift and the inter-story drift when considering second-order effect,are much bigger than those in traditional first order calculation method. For the structure design considering second-order effect, if we still use the drift limit of our country＇s current design code, the amount of steel will increase significantly. Compared with second-order accurate calculation method, the second-order simplified calculation method has good accuracy and can be used to calculate the second-order drift of the steel frame.