作　　者： ; ; ;

机构地区： 兰州理工大学土木工程学院西部土木工程防灾减灾教育部工程研究中心

出　　处： 《防灾减灾工程学报》 2014年第2期229-234,共6页

摘　　要： 国内外学者利用非线性静力方法进行结构倒塌分析时,研究对象主要集中在规则的结构形式,而针对大量出现的造型独特的竖向不规则建筑的倒塌研究还相对较少。本文基于拆除构件法,利用SAP2000结构有限元软件,对竖向不规则多层框架结构进行了基于非线性静力Pushdown方法的抗连续性倒塌研究。分别研究了拆除同一结构中不同部位构件、不同层数塔楼结构中相同部位构件后剩余结构的承载力变化情况,研究结果表明:拆除竖向承重柱后的剩余结构承载力,随着上部塔楼层数的增加以及拆柱位置的上升而出现不同程度的降低;加强裙楼顶部水平向承重构件,可以使塔楼底部构件破坏后的剩余结构更好地发挥悬链线机制,并防止剩余结构发生无明显征兆的连续性倒塌。 Lots of scholars both at home and abroad always focus on the regular structures by using the nonlinear-static method for structural collapse analysis in recent years.The nonlinearstatic method is very practical and convenient for researchers in structures studies.However,the progressive collapse study for the irregular structures was relatively less.In this paper,the research of progressive collapse acts of vertically irregular frame structures was carried out with the structural finite element software SAP2000based on the alternate path method.In order to show the collapse law of the remaining structures clearly,the columns of different parts in the same structure and the columns of the same part in different structures were removed,and then the bearing capacity of the relevant reaming structures was compared.After the comparison and analysis,several useful methods for progressive collapse prevention were set out.The analysis result shows that the bearing capacity of the remaining structure goes down with the tower layer increasing and the position of the target column moves up after removing the target column.It is very helpful to strengthen the horizontal elements near the top of podiums which can make the remaining structure achieve its catenary effect and prevent sudden collapse of the remaining structure without obvious signs.In the future,the designers and researchers should pay more attentions on the sensitive parts of the irregular structures,and strengthen the parts mentioned above to prevent the occurrence of the progressive collapse of the irregular structures.

关 键 词： 竖向不规则 框架结构 连续性倒塌 非线性静力方法

领　　域： [建筑科学]