组合楼板对空间钢框架结构的抗连续倒塌能力影响研究

Study on the Influence of Composite Floor Slab on Progressive Collapse Resistance of Space Steel Frame Structures

采用GSA2003对规则钢框架结构抽柱的位置建议,模拟抽取角柱工况,分别从传力路径、剩余结构承载力储备角度对纯框架结构及含楼板结构进行了连续倒塌分析评估。并对两结构进行了非线性静力及动力分析,以期为钢框架结构抗连续倒塌研究提供一定参考依据。结果表明:在连续倒塌分析中,组合楼板能加速新传力路径的形成,降低剩余结构的竖向振动幅度,提高剩余结构承载力储备,改善钢框架结构抗连续倒塌性能;非线性动力分析较非线性静力分析耗时,建议可采用能力曲线代替结构抗连续倒塌动力分析。

Based on the position recommends of column extraction for regular steel frame structures in GSA2003, the working condition of corner columns extraction was simulated, and the progressive collapse analysis and evaluation of pure frame structure and slab-containing structure were carried out respectively from the perspectives of load transfer path and residual structural bearing capacity reserve. At the same time, the nonlinear static and dynamic analysis of the two structures were carried out. It is expected to provide some reference for the research of steel frame structure against progressive collapse. The results showed that the composite floor can accelerate the formation of new load transfer path, reduce the vertical vibration amplitude of the remaining structure, increase the bearing capacity reserve of the remaining structure, and improve progressive collapse resistance of steel frame structures. Non-linear dynamic analysis is more time-consuming than the non-linear static analysis, so it is suggested that the capacity curve can be used to replace the non-linear dynamic analysis of the progressive collapse resistance of structures.