不等跨RC框架的抗连续倒塌理论分析及鲁棒性评判指标研究  

STUDY ON ANALYTICAL MODEL AND ROBUSTNESS RANKING INDEX OF RC FRAMES WITH UNEQUAL SPANS AGAINST PROGRESSIVE COLLAPSE

作　　者：甘艺平 喻君[2] 陈隽[1] 申家旭 GAN Yi-ping;YU Jun;CHEN Jun;SHEN Jia-xu(College of Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering and Transportation,Hohai University,Nanjing 210098,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]河海大学土木与交通学院,南京210098

出　　处：《工程力学》2022年第8期210-222,共13页Engineering Mechanics

基　　金：国家自然科学基金重点项目(U1711264);土木工程防灾国家重点实验室项目(SLDRCE19-B-22)。

摘　　要：现有钢筋混凝土(RC)框架抗连续倒塌的理论分析模型仅适用于等跨结构。通过理论推导将现有等跨结构的分析模型推广至不等跨结构,并提出了一个新的修正三折线模型,可以考虑不同工况下结构的抗弯、压拱、悬梁线和拉膜效应机制。利用所提理论分析模型建立了一个鲁棒性评判指标,用于危险工况的快速判断。数值与理论结果对比表明:所提出的修正三折线理论分析模型准确性高,能够为不等跨RC框架抗连续倒塌设计提供参考;所建立的鲁棒性评判指标可用于快速确定出RC框架的最危险柱子失效工况。The existing analytical models of reinforced concrete(RC)frames against progressive collapse are only available to structures with equal spans.Therefore,a new modified tri-linear model is proposed for RC frames with unequal spans,which can consider the flexural action,compressive arch action,catenary action and tensile membrane action of the structure under different single column loss.A robustness ranking index is also established based on the proposed model to quickly identify the dangerous column loss scenarios.The results show that the proposed model is accurate and can provide a reference for the design of RC frames with unequal spans against progressive collapse.And the robustness ranking index can be used to quickly identify the worst column loss scenarios of RC frames.

关 键 词：连续倒塌 RC框架 不等跨 理论模型 鲁棒性评判指标 

分 类 号：TU375.4[建筑科学—结构工程]