摘要
综合吊挂体系构件破坏可能引起体系发生连续性倒塌,采用有限元分析综合吊挂体系单根吊杆及吊杆群组失效后剩余结构的应力及应变特性,判断构件破坏及确定倒塌范围。结果表明单根吊杆破坏会引起相邻吊杆及桥架破坏,吊杆群组破坏会引发局部吊挂体系倒塌。通过在关键部位设置冗余约束可以提高体系的鲁棒性。采用具有良好抗震性能的斜拉杆侧向约束构件,竖向吊杆失效后水平支撑通过斜拉杆与两侧主钢梁形成新的有效传力体系,单根吊杆及吊杆群组发生破坏后均不会向周边扩展。采用紧邻双斜拉杆体系进行综合吊挂体系分区,可控制综合吊挂体系子区域面积满足抗连续倒塌范围。
Progressive collapse may be initiated by failure of the member of the composite suspension system. Using finite element software,we analysis the stress and strain distribution of the residual composite suspension structure after the damage of the single suspender or suspender group.Based on the stress and strain distribution,it is possible to determine damage of the members and confirm the scope of collapse.The simulation results show that the failure of the adjacent members or the bridge leads to the collapse of the suspension structure.The structure robustness can be improved by adding redundant at the key position.The failure not spread after the damage of the single suspender or suspender group if the new load transfer path is formed through effective diagonal member with both sides of the main beam and horizontal structure members which have good seismic performance.
出处
《结构工程师》
北大核心
2015年第4期85-91,共7页
Structural Engineers
关键词
综合吊挂体系
关键构件
连续倒塌
有限元分析
侧向约束
composite suspension structure, key structural members, progressive collapse, finite element analysis, lateral restraint
