网架结构拆除倒塌数值模拟研究  

Numerical Simulation Research on Demolition and Collapse of Space Truss Structures

作　　者：陈振明 梁安锐 李纪元 张惊宙 冯然 黄世涛 江磊 CHEN Zhenming;LIANG Anrui;LI Jiyuan;ZHANG Jingzhou;FENG Ran;HUANG Shitao;JIANG Lei(China Construction Steel Structure Engineering Co.,Ltd.,Shenzhen 518118,China;School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]中建钢构工程有限公司,广东深圳518118 [2]哈尔滨工业大学(深圳)土木与环境工程学院,广东深圳518055 [3]广州大学土木工程学院,广州510006

出　　处：《工业建筑》2022年第10期61-70,共10页Industrial Construction

基　　金：中建股份科技研发计划项目(CSCEC-2020-Z-24);国家自然科学基金面上项目(52178131);深圳市高等院校稳定支持计划面上项目(GXWD20201230155427003-20200804174353001)。

摘　　要：采用数值模拟ABAQUS隐式动力分析的方法对三种常见的平面桁架系网架:正交正放、正交斜放、三向网架和四种角锥系网架:单向折线形、正放四角锥、斜放四角锥和三角锥网架进行拆除倒塌研究。通过将平面桁架倒塌试验和深圳体育馆屋盖网架的实际拆除倒塌情况与数值模拟结果进行对比,验证了数值模拟的准确性。并采用杆件的敏感性分析方法计算结构杆件的重要性系数,确定了不同类型网架拆除中的重要杆件,并制定相应的拆除方案。网架拆除倒塌的研究表明,在拆除网架结构柱端既定的杆件群后,其剩余柱端杆件压应力增大,并发生受压失稳屈曲是导致网架发生竖向大变形的主要原因;网架向下倒塌至柱顶下侧时,柱端杆件转为受拉,并通过悬链线效应来传递竖向荷载,最终发生的强度破坏是导致网架发生整体倒塌的主要原因。The implicit dynamic analysis by finite-element(FE)software ABAQUS was utilized to conduct numerical simulations on the demolition and collapse process of three common plane truss structures,namely,orthogonal,orthogonal diagonal,and three-dimensional space trusses,and four pyramid space trusses,i.e.,one-way folding line,square pyramid,diagonal square pyramid,and triangular pyramid space trusses.The collapse test of the plane truss structure and the actual demolition and collapse situation of the roof space truss of Shenzhen Gymnasium were compared with the numerical simulations,which verified the accuracy of the numerical simulation.The sensitivity analysis of elements was made to calculate the importance factor of elements and determine the important elements in the demolition of different space trusses,and corresponding demolition plans were formulated.The research results show that after the fixed element group at the column ends of space truss structures is demolished,the compressive stress of the residual elements at the column ends is increased,and buckling instability caused by the compressive stress accounts for the large vertical deformation of the space truss.When the space truss falls down below the top of the column,the elements at the column ends are subjected to the tensile stress,and the catenary action in the truss provides an alternate way for the vertical load,which leads to the strength failure,the main reason for the overall collapse of the space truss.

关 键 词：网架拆除倒塌模拟 杆件敏感性分析 屋盖网架 平面桁架系网架 角锥系网架 

分 类 号：TU356[建筑科学—结构工程] TU312.3