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基于位移性能,对比分析了纯钢框架结构、钢框架-V形(跨层X形)支撑结构与钢框架-同层X形支撑结构抗连续性倒塌的力学性能。研究结果表明:钢框架-支撑结构的荷载储备系数LRR明显优于纯钢框架结构,且钢框架-同层X形支撑结构优于钢框架-V形(跨层X形)支撑结构。对纯钢框架结构及钢框架-支撑结构进一步开展了静态与考虑“去柱”动力效应的动态Pushdown分析,研究结果表明:两种分析情形下结构的倒塌模式基本一致,结构剩余承载力基本相同。但是钢框架-支撑结构存在能够显著减小“瞬间去柱”引起的突变位移幅度,减缓柱损坏时结构的动力响应,且钢框架-同层X形支撑结构优于钢框架-V形(跨层X形)支撑结构。
Based on the displacement performance, mechanical properties of pure steel frame structure, steel frame-V shape (cross-layer X-shape) support structure and steel frame-same layer X-shaped support structure were compared and analyzed. The results show that the LRR of steel frame-support structure is obviously superior to pure steel frame structure, and the steel frame-same-layer X-shaped support structure is superior to the steel frame-V-shaped (cross-layer X-shaped) support structure. The dynamic Pushdown analysis of static steel structure and steel frame-support structure is also carried out. The results show that the collapse modes of the two structures are basically the same, the residual capacity of the structure basically the same. However, the existence of steel frame-support structure can significantly reduce the sudden displacement caused by “instantaneous column removal” and reduce the dynamic response of the structure when the column is damaged. Moreover, the steel frame-the same-layer X-shaped support structure is superior to the steel frame- (Cross-layer X-shaped) support structure.