强震下钢框架结构易损性分析及优化设计_徐龙河.pdfVIP

30 1 Vol.30 No.1 2013 1 Jan. 2013 ENGINEERING MECHANICS 175 1000-4750(2013)01-0175-05 1 1 2 (1. 100044 2. 300072) 9 Benchmark TU352 A doi: 10.6052/j.issn.1000-4750.2011.06.0373 VULNERABILITY ANALYSIS AND OPTIMIZATION DESIGN FOR STEEL FRAME STRUCTURE UNDER STRONG EARTHQUAKES 1 1 2 XU Long-he , SHAN Xu , LI Zhong-xian (1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. School of Civil Engineering, Tianjin University, Tianjin 300072, China) Abstract: An improved two-parameter damage model is established by considering the effect of hysteretic deformation amplitude to accumulative damage energy dissipation. A new method of seismic damage assessment based on vulnerability analysis is proposed and the maximum inter-story drift angle is taken as the variable index to evaluate the global performance of structures. According to the response characteristics of a 9-story benchmark steel model structure under strong earthquakes, the optimization design is made to the weak stories and the theoretical vulnerability curves of the original steel frame structure and the one after optimization are obtained respectively, the damage status of the structures under different intensity earthquakes are evaluated. The analysis of structural anti-collapse capability on both structures is conducted based on Collapse Margin Ratio and results indicate that the proposed method can accurately evaluate the damage of a steel structure under strong earthquakes, and the anti-collapse capability of the optimized structure is improved largely. Key words: steel frame structure; da