TU375; TH123＋.4
（国家自然科学基金资助项目(51178211，51578274)
- BAO Chao1,3, DU Yongfeng1,2, XU Tianni1, QI Lei1, SONG Xiang1
BAO Chao1,3, DU Yongfeng1,2, XU Tianni1, QI Lei1, SONG Xiang1
(1.Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology Lanzhou, 730050, China)(2.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology Lanzhou, 730050, China)(3.School of Civil Engineering and Hydraulic Engineering, Ningxia University Yinchuan, 750021, China)
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为了研究结构抗连续倒塌鲁棒性，基于地震作用下框架结构受力特征，结合备用荷载路径法与动力时程分析法，提出了结构鲁棒性定量分析方法，并根据震级震中距条带地震动记录选取方法选取随机地震动记录进行算例分析和验证。研究表明，结构的鲁棒性优劣是一个相对概念，与外部作用强度呈反相关关系；通过定量分析结构鲁棒性，可以在多个结构方案筛选时提供一定的参考；降低重要构件的损伤风险，对易损性系数和重要性系数均较大的构件设置提供可靠保护，加强构件之间相互联系，提高备用荷载路径的可靠性，能够增强结构的鲁棒性。
In order to study progressive-collapse resistance robustness of a frame structure, we propose a quantitative analysis method of structural robustness, based on the mechanical characteristics of the frame structure under an earthquake. We verified the correctness and practicability of this method with an example. The results showed that the quality of structural robustness was relative and negatively correlated with the load magnitude. The quantitative analysis method of structural robustness can be used for the structural design scheme selection. The structural robustness can be improved by reducing the member vulnerability coefficient of important columns, protecting the component with a large vulnerability coefficient and importance coefficient, strengthening the connection between members, and ensuring the reliability of the load path under extreme conditions.
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