基于构件重要性的RC框架结构鲁棒性的快速评估方法  

A rapid assessment method for structural robustness of RC frame based on member importance

作　　者：李瑞然 喻君 周星德[1] Li Ruiran;Yu Jun;Zhou Xingde(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education,Southeast University,Nanjing 211189,China)

机构地区：[1]河海大学土木与交通学院,南京210098 [2]东南大学爆炸安全防护教育部工程研究中心,南京211189

出　　处：《东南大学学报（自然科学版）》2023年第6期1137-1147,共11页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51978246)。

摘　　要：为了快速评估钢筋混凝土(RC)框架结构鲁棒性,通过广义应变能表征构件的易损性以反映构件属性,通过失效柱对应的梁板子结构承载力表征荷载传递路径.基于构件易损性和荷载传递路径指标建立可快速评价三维RC框架结构中构件重要性和单构件失效后受损结构鲁棒性的方法,该方法仅需整体结构线弹性分析和理论计算便可快速实施.针对一个基于中国建筑规范设计的典型规则框架结构的有限元分析,考虑了楼层数、层高、跨长的影响,验证所提方法针对三维规则结构鲁棒性评价的可行性和合理性.此外,通过2种典型竖向不规则结构的有限元分析,验证了该方法针对不规则结构柱在不同楼层下重要性识别的有效性.结果表明,所提出的评价方法可以快速、准确评估三维结构构件的重要性和单柱失效后受损结构的鲁棒性.对于规则框架结构,在给定单柱失效工况下,层高对结构位移响应的影响大于楼层数,但远弱于跨度的影响.To rapidly assess the structural robustness of reinforced concrete(RC)frame,the generalized strain energy is used to characterize the fragility of members,which represents the member attributes,while the bearing capacity of beam-slab substructures corresponding to the removed column is used to showcase the contribution of load transfer path.Based on the fragility of the members and the load transfer path index,an analytical method is established to quickly evaluate the importance of members in a three-dimensional(3D)RC frame structure and the robustness of the damaged structure after failure of a single member.The method can be implemented via linear elastic analysis of the overall structure and theoretical computation.The finite element analysis of a typical regular frame structure designed according to Chinese building codes,considers the effects of number of stories,story height and span length,and proves the feasibility and reasonability of the proposed method for the evaluation of robustness of 3D regular structures.Moreover,the feasibility of the method for importance identification of irregular structural columns under different stories is verified through finite element analysis of two typical vertical irregular structures.The results show that the proposed method can quickly and accurately evaluate the member importance in a 3D structure and the robustness of the damaged structure after failure of a single member.For a regular frame structure,in a given column removal scenario,the influence of storey height on the displacement response of the structure is greater than that of the number of floors,but is much less than that of span length.

关 键 词：连续倒塌 易损性 荷载传递路径 结构鲁棒性 构件重要性 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]