受重载车辆撞击桥梁的剩余车行可靠度研究  

Residual Traffic Reliability of Bridge Structures Subjected to Heavy-Duty Truck Collision

作　　者：刘浪[1] 赵一飞 夏永庆 罗浩[1] 徐漫菲 LIU Lang;ZHAO Yifei;XIA Yongqing;LUO Hao;XU Manfei(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Anhui Urban Construction Design Institute Co.,Ltd.,Hefei 230051,Anhui,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]安徽省城建设计研究总院股份有限公司,安徽合肥230051

出　　处：《重庆交通大学学报(自然科学版)》2025年第3期1-8,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(51708069);重庆市自然科学基金项目(cstc2018jcyjA2535);重庆交通大学研究生创新科研项目(2023S0030)。

摘　　要：为探究桥梁在遭受重载车辆撞击之后的通行可靠性,以一座典型RC梁桥为依托,建立了桥墩受重载车辆撞击后的极限状态方程。考虑车-桥碰撞随机过程中主要参数的随机性,对桥墩失效概率进行了计算,并对其中的关键随机变量进行了参数敏感性分析;提出了桥墩受撞损伤指标及剩余承载力折减计算方法;基于桥梁设计规范标准车道、车辆荷载模型和WIM重载模型,通过设置不同通行参数对桥梁有限元进行加载,对撞击之后桥梁通行可靠度进行了分析。研究结果表明:桥墩遭受2、 3轴重车撞击后,桥墩仍具备承受设计荷载的能力;遭受4、 5轴重车撞击后,桥墩不适宜继续服役。通行车辆类型及在桥面位置对受撞桥墩的再服役失效概率有明显影响,总体而言WIM重载模型导致桥墩失效概率比规范标准车辆荷载大1.5~2.0倍;当车辆靠近桥墩中心线位置行驶时,受撞墩失效概率显著降低。To explore the traffic reliability of bridge structures subjected to heavy-duty truck collision,a typical reinforced concrete(RC) bridge was selected as the object and the limit state equation was developed for bridge piers being impacted by heavy-duty trucks.Considering the randomness of the main parameters in the random process of vehicle bridge collision,the failure probability of piers was calculated,and parameter sensitivity analysis was conducted on the key random variables involved.Then,collision damage indicators and residual bearing capacity reduction calculation methods for bridge piers were proposed.At end,using the standard lane and vehicle load models specified in bridge design specifications,as well as the WIM heavy-load model,different traffic parameters were set to load the bridge's finite element analysis.The bridge traffic reliability after the collision was analyzed.Research results indicate that after being impacted by heavy-duty vehicles with 2 or 3 axles,the bridge pier still retains its ability to withstand the design load.However,after being impacted by heavy-duty vehicles with 4 or 5 axles,the bridge pier is no longer suitable for continued service.The type of passing vehicles and their position on the bridge deck significantly affect the probability of the impacted bridge pier failing to continue serving.Overall,the failure probability for the bridge pier caused by WIM heavy-load model is 1.5 to 2.0 times greater than that under the standard vehicle load specified in the specifications.When vehicles approach the centerline of the bridge pier,the probability of failure of the impacted pier is significantly reduced.

关 键 词：桥梁工程 重载车辆 桥墩撞击 抗力折减 设计荷载 失效概率 

分 类 号：U447[建筑科学—桥梁与隧道工程]