建筑结构学报2026，Vol.47Issue(2)：20-30,11.DOI:10.14006/j.jzjgxb.2025.0184
交叉撑杆和抗滑移下弦索段的张弦梁结构抗连续倒塌动力试验研究
Dynamic experimental study on progressive collapse resistance of beam string structure with cross-struts and anti-slip connections between lower cable segments
摘要
Abstract
To overcome the inherent limitations of conventional beam string structures,such as low structural redundancy and vulnerability to progressive collapse,a beam string structure incorporating cross-struts and anti-slip connections between lower cable segments was proposed.Following the alternative load path(ALP)methodology,an initial cable rupture trigger device and a physical test model for anti-progressive collapse assessment were designed and constructed.High-frequency measurement systems for dynamic strain,displacement,and cable force were employed to perform dynamic progressive collapse tests.The investigation focused on structural response characteristics,collapse progression mechanisms,and internal force redistribution following mid-span cable section failures.It is found that the electromagnetic-lever activation device effectively simulates cable rupture.After cable failure,the lower diagonal struts in the damaged zone experience instantaneous stress increase,becoming key structural components to resist progressive collapse.Under the design case,the composite truss action formed by the upper chord beam and cross-struts successfully redistributes the unbalanced forces through reconstructed load paths,achieving a maximum displacement of 63 mm,which is approximately 1/100 of the span length and effectively preventing structural collapse.In ultimate capacity case,initial lower cable rupture triggers sequential tensile failures of adjacent struts,leading to the loss of truss action and plastic hinge formation at the upper chord beam's mid-span,which then extend to the connections with upper diagonal struts,causing local buckling and subsequent structural collapses.关键词
张弦梁结构/交叉撑杆构型/动力试验/抗连续倒塌/倒塌模式Key words
beam string structure/cross-strut configuration/dynamic experiment/anti-progressive collapse/collapse mode分类
建筑与水利引用本文复制引用
周浩,张锦康,沈岩,蒋友宝,李志鹏..交叉撑杆和抗滑移下弦索段的张弦梁结构抗连续倒塌动力试验研究[J].建筑结构学报,2026,47(2):20-30,11.基金项目
国家自然科学基金项目(52378126,52508154),长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj230504),长沙理工大学研究生科研创新项目(CLSJCX24012). （52378126,52508154）
