RC空间框架连续性倒塌数值分析  

Numerical Analysis on Progressive Collapse of RC Spatial Frame

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作  者:李小伟 雷光宇 Li Xiaowei;Lei Guangyu

机构地区:[1]长沙理工大学土木工程学院,湖南长沙410114

出  处:《重庆建筑》2021年第7期35-38,共4页Chongqing Architecture

摘  要:为研究楼板厚度和柱距对RC空间框架连续性倒塌性能的影响,基于现有试验建立数值模型并验证其正确性。随后考虑三种楼板厚度和柱距,共建立9个数值模型进行分析,得到了结构的应力分布情况、荷载-位移曲线,以及侧向位移和极限应变。结果表明,适当增加板厚或者减小失效柱与邻柱的间距可以增大结构承载力,使失效模式从悬链线机制转变为梁机制,有利于防止连续性倒塌。In order to study the influence of floor slab thickness and column spacing on the progressive collapse of a RC spatial frame,numerical models were established based on the existing experiments,with its accuracy verified.A total of nine numerical models considering three types of floor slab thickness and column spacing were established and analyzed,yielding the structure's stress distribution,load-displacement curves,lateral displacement and ultimate strain.The results showed that an appropriate increase of the floor slab thickness or an appropriate decline of column spacing between the invalid column and adjacent columns can improve the bearing capacity of the structure,transforming the failure mode from the catenary mechanism to the beam mechanism,which can help prevent progressive collapse.

关 键 词:连续倒塌 悬链线机制 梁机制 楼板 柱距 

分 类 号:TU375[建筑科学—结构工程]

 

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