中柱失效时多层RC平面框架荷载传递机理研究  

Load Transfer Mechanisms of Multi-story Planar Frame Subjected to a Middle Column Removal Scenario

作　　者：程建军[1] 喻君[1] 刘军[1] 

机构地区：[1]河海大学土木与交通学院安全与防灾工程研究所,江苏南京210098

出　　处：《防灾减灾工程学报》2016年第2期259-266,280,共9页Journal of Disaster Prevention and Mitigation Engineering

摘　　要：采用有限元软件SAP2000对中柱失效时多层钢筋混凝土(RC)平面框架抗连续倒塌性能进行了非线性静力分析,研究其抗倒塌的承载力及其对应的荷载传递机理。在模型验证的基础上,对不同加载方式、约束条件、不同跨数的模型及子结构的选取形式进行了分析,并通过结构抗力曲线、各层梁内力变化的对比,研究了平面框架的荷载传递机理。结果表明:荷载施加方式对各层梁内力影响较小,但对于各层中柱轴力分布影响较大;平面框架跨数的增加和空间框架均对所研究的多层平面框架抗力曲线影响不大,但相应梁柱的内力均发生了较大变化;平面框架仅能在一定程度上反映实际结构的受力机理,其与空间子结构中的平面部分还略有差异。In this paper,finite element software SAP2000 was employed for nonlinear static analysis of a multi-story reinforced concrete（RC）planar frame under a middle column removal scenario,to investigate the load transfer mechanisms against progressive collapse.After the numerical model was validated by experimental results,the model was further extended to study the effect of loading pattern,boundary conditions,the number of frame spans and the isolation of typical sub-structures on the load transfer mechanisms of multi-story RC planar frames through the comparisons of structural resistances and internal forces of different frame models.The results showed that the loading pattern has little impact on internal forces of beams,but has evident impact on the internal forces of the columns above the removed one;the increase of the number of planar frame spans and the three dimensional skeleton frame models have little effect on the structural resistance curve,but evidently affect the internal forces of corresponding beams and columns;planar frame can reflect the load transfer mechanisms of actual structures to some extent,but still slightly differs from the planar part of three-dimensional structures in terms of the load transfer mechanisms.

关 键 词：连续倒塌 钢筋混凝土 平面框架 荷载传递机理 

分 类 号：TU352.1[建筑科学—结构工程]