基于位移性能的钢框架-支撑结构连续性倒塌Pushdown分析*
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（1 西北工业大学力学与土木建筑学院，西安 710129； 2 西安建筑科技大学土木工程学院，西安 710055）
［摘要］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。［关键词］钢框架; 支撑结构; 连续性倒塌; Pushdown分析; SAP2000软件中图分类号：TU312+.3 文献标识码：A 文章编号：1002-848X(2016)06-0061-05
Pushdown analysis of progressive collapse of steel frame-brace structure based on displacement performanceChen Changhong1, Zhu Yanfei1, Yao Yao1, Huang Ying2(1 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710129, China; 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China)Abstract: Based on the displacement performance, comparative analysis was performed on the mechanical properties of progressive collapse for the pure steel frame, steel frame with V-shaped (cross-layer X-shaped) brace structure and steel frame with X-shaped (same-layer X-shaped) brace structure. The results show that the Load Reserve Factor (LRR) of steel frame-brace structure system is significantly better than that of pure steel frame structure, and the LRR of steel frame with V-shaped (cross-layer X-shaped) brace structure is better than that of steel frame with X-shaped (same-layer X-shaped) brace structure. Further static and dynamic (considering dynamic effects by removing column) Pushdown analyses were carried out. The results show that the collapse modes are generally similar using these two analytical models, and there is the same situation on structural residual bearing capacity. The presence of the brace not only obviously reduces the mutation displacement amplitude for removing column instantly, but also slows down the dynamic response of structural damage, and the steel frame with X-shaped (same-layer X-shaped) brace structure is better than the steel frame with V-shaped (cross-layer X-shaped) brace structure.Keywords:steel frame; brace structure; progressive collapse; Pushdown analysis; SAP2000 software
*国家自然科学基金（51408489,51308448,51301136），陕西省自然科学基金（2014JQ7255），中央高校基本科研业务费专项基金（3102014JCQ01047），西北工业大学本科毕业设计重点扶持项目。作者简介：陈昌宏，博士，副教授， Email：changhong.chen@nwpu.edu.cn。
