圆钢管约束型钢混凝土柱-钢梁框架结构体系分析

Analysis of circular tubed steel reinforced concrete column to steel beam frame structure system

为研究采用钢管约束型钢混凝土柱的高层结构的抗震性能,对钢管约束型钢混凝土柱-钢梁框架开展弹塑性有限元分析。通过开源的OpenSees有限元软件,建立具有代表性的框架有限元分析模型,以框架柱类型(钢管混凝土(CFT)柱和钢管约束型钢混凝土(TSRC)柱)、柱梁端弯矩比、径厚比为研究参数,开展Pushover分析、时程分析、IDA分析和地震易损性分析,比较不同算例的能力曲线、屈服机制、层间位移和抗倒塌能力等。基于体系分析结果,建议钢管约束型钢混凝土柱-钢梁框架结构体系的最大适用高度,弹性及弹塑性层间位移角限值可按GB 50936—2014《钢管混凝土结构设计规范》取值;与增大钢管壁厚相比,提高柱截面型钢含钢率对改善高烈度设防区钢管约束型钢混凝土柱-钢梁框架的抗震性能更为有效。

To investigate the seismic behavior of tubed steel reinforced concrete column as a structural type in high-rise buildings,the elasto-plastic analysis of circular tubed steel reinforced concrete column to steel beam frame structure system was carried out.Representative frame analysis models were established through the open-source finite element software OpenSees;and the pushover analysis,time-history analysis,incremental dynamic analysis(IDA),and seismic vulnerability analysis were carried out by taking frame column type(concrete-filled steel tube(CFT)column and tubed steel reinforced concrete(TSRC)column),column to beam strength ratio,and diameter to thickness ratio considered as the main parameters.The capacity spectrum,yield mechanism,inter-story displacement,and collapse resistance were compared and analyzed.Based on the analysis results,it is suggested that the maximum applicable height and maximum story drift ratio limits of TSRC frame structures can be taken according to GB 50936—2014‘Technical code for concrete filled steel tubular structures’.Compared with increasing the wall thickness of steel tubes,increasing the steel ratio of steel section is more effective in improving the seismic performance of TSRC frames in high-intensity areas.