车致拱桥短吊杆弯曲效应及疲劳体系可靠性评估方法研究  

Research on the Bending Effect and Fatigue System Reliability Evaluation Method of Short Suspension Rods in Arch Bridges under Vehicle Load

作　　者：肖新辉 张智丰 张海萍 曹原 XIAO Xin-hui;ZHANG Zhi-feng;ZHANG Hai-ping;CAO Yuan(Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学,株洲412007

出　　处：《价值工程》2024年第3期143-145,共3页Value Engineering

摘　　要：拱桥短吊杆疲劳脆断是引起桥梁垮塌的主要原因,吊杆中平行钢丝的体系失效机制尚不明确。为解决这一问题,本文采用瞬态分析法分析了车载作用下拱桥短吊杆的“弯拉”作用,研究了吊杆中平行高强钢丝的应力分布特征,讨论了平行钢丝的疲劳失效路径。研究表明:短吊杆疲劳破坏失效时弯曲受拉侧的高强丝应力最大,平行钢丝由受拉侧向受压侧进行疲劳断裂传递。以国内系杆拱桥芙蓉镇大桥为例,计算其短吊杆体系可靠指标,吊杆运营25年后其可靠度指标进入预警区间。The fatigue and brittle fracture of short suspension rods in arch bridges is the main cause of bridge collapse,and the failure mechanism of the parallel steel wire system in the suspension rods is not yet clear.To solve this problem,this paper uses transient analysis method to analyze the"bending and pulling"effect of the short suspension rod of the arch bridge under the action of vehicle load,studies the stress distribution characteristics of parallel high-strength steel wires in the suspension rod,and discusses the fatigue failure path of parallel steel wires.Research has shown that when a short suspension rod fails due to fatigue failure,the high-strength wire stress on the bending tensile side is the highest,and the parallel steel wire undergoes fatigue fracture transmission from the tensile side to the compressive side.Taking the domestic tied arch bridge Furong Town Bridge as an example,the reliability index of its short suspension rod system is calculated.After 25 years of suspension rod operation,its reliability index enters the warning range.

关 键 词：短吊杆 系杆拱桥 平行钢丝 体系可靠性 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]