东南大学学报（自然科学版）2025，Vol.55Issue(1)：9-15,7.DOI:10.3969/j.issn.1001-0505.2025.01.002
预应力张弦桁架的抗连续倒塌分析与性能提升
Anti-progressive collapse analysis and performance enhancement of prestressed truss string structures
摘要
Abstract
For the progressive collapse issue of prestressed truss string structures,the finite element method is used to analyze the progressive collapse mechanisms under the failure of cable,lower chord at the support,up-per chord at the mid-span,and mid-span strut,respectively.An anti-collapse-sleeved member with secondary stiffness is proposed and its feasibility is verified.The anti-progressive collapse analysis is conducted on the prestressed truss string structure with the anti-collapse-sleeved members.The results indicate that the progres-sive collapse resistance of prestressed truss string structures under the failure of cable or lower chord at the sup-port is significantly lower than those under the failure of other members.When the cable fails,the axial force of the upper chords at the mid-span increases rapidly until it buckles,followed by the formation of the plastic hinge,and the vertical displacement in the mid-span increases significantly without convergence.When the lower chord at the support fails,the webs near the support buckle owing to the increased axial force,subse-quently resulting in the support failure.The progressive collapse resistance of the prestressed truss string struc-ture with anti-collapse sleeved members under the failure of cable and lower chord at the support increases by 24.0%and 28.6%,respectively.关键词
预应力张弦桁架/连续倒塌机理/抗连续倒塌承载力/性能提升Key words
prestressed truss string structure/progressive collapse mechanism/progressive collapse resis-tance/performance enhancement分类
建筑与水利引用本文复制引用
刘文豪,曾滨,周臻,龚鹏,江凯萍..预应力张弦桁架的抗连续倒塌分析与性能提升[J].东南大学学报（自然科学版）,2025,55(1):9-15,7.基金项目
国家重点研发计划资助项目(2022YFC3801800) （2022YFC3801800）
国家自然科学基金青年学生基础研究资助项目(523B2086). （523B2086）
