考虑悬链线效应的RC框架结构鲁棒性分析  

Robustness analysis of RC frame structure considering the catenary action

作　　者：崔双双 魏中飞[1] 乔泽惠 林涛 陈伟宏 CUI Shuangshuang;WEI Zhongfei;QIAO Zehui;LIN Tao;CHEN Weihong(School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Key Laboratory of Underground Engineering of Universities in Fuzhou,Fujian University of Technology,Fuzhou 350118,China;School of Civil Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福建工程学院土木工程学院,福建福州350118 [2]福建工程学院地下工程福建省高校重点实验室,福建福州350118 [3]福州大学土木工程学院,福建福州350116

出　　处：《地震工程与工程振动》2021年第1期100-112,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51508099);福州市科技局科技计划项目(2018-G-52);福建省交通厅重点项目(201914)。

摘　　要：为了充分反映结构的抗连续倒塌能力,文中基于能量原理,将结构倒塌时消耗能量与屈服时消耗能量之比定义为考虑悬链线效应的结构鲁棒性指标。首先进行一榀1/2缩尺的RC平面框架的连续倒塌试验,得到了具有双峰值点的荷载-位移曲线。基于试验数据对有限元模型进行验证与校准。进一步建立了18个RC平面框架结构数值分析模型,研究了中柱失效、边柱失效及不同梁底部纵向钢筋配筋率、顶部纵向钢筋配筋率等对考虑悬链线效应的结构鲁棒性影响规律。分析结果表明,由于边柱失效的结构无法发挥悬链线效应,鲁棒性较差;而中柱失效后的结构,由于其存在悬链线效应,结构表现出了更好的鲁棒性。结构鲁棒性系数随着梁底部钢筋配筋率的增加而降低,随着梁上部钢筋配筋率的增加而提高,梁上部钢筋配筋率显著影响结构的鲁棒性。本文提出的基于能量的考虑悬链线效应的结构鲁棒性计算方法,为RC框架结构抗连续倒塌设计提供了理论支持。In order to fully quantify the structure’s ability to resist progressive collapse,the ratio of the energy consumed when the structure collapses to the energy consumed when the structure yields was defined as the structural robustness index that considering the catenary action.First,a progressive collapse test of a 1/2-scale RC plane frame structure was carried out,and a load-displacement curve with double peak points was obtained.Then,the finite element model was validated and calibrated based on the test data.Further,18 RC plane frame structure numerical analysis models were established,and the influence of middle-column failure,edge-column failure,different longitudinal reinforcement ratios at the bottom of the beam and different longitudinal reinforcement ratios at the top of the beam on the structural robustness considering the catenary action was studied.The analysis results show that the edge-column failure structure cannot exert the catenary action,and its robustness is poor;while the middle-column failure structure shows better robustness due to the catenary action.The structural robustness coefficient decreases with the increase of the reinforcement ratio at the bottom of the beam and increases with the increase of the reinforcement ratio at the top of the beam,which significantly affects the robustness of structure.The energy-based structural robustness considering the catenary action proposed in this paper provides theoretical support for the design of RC frame structure against progressive collapse.

关 键 词：RC框架 鲁棒性 连续性倒塌 悬链线效应 能量 

分 类 号：TU375.4[建筑科学—结构工程]