高速公路组合式桥梁护栏碰撞安全性能仿真研究  

Simulation Study on Safety Performance of Expressway Combined Bridge Barriers under Impacts

作　　者：黎连回 LI Lianhui(China Railway 20 th Bureau Group Third Engineering Company Limited,Chongqing 400065)

机构地区：[1]中铁二十局集团第三工程有限公司,重庆400065

出　　处：《公路交通技术》2024年第3期81-89,共9页Technology of Highway and Transport

摘　　要：针对高速公路护栏改造采用的组合式桥梁护栏方案,建立车辆-护栏碰撞非线性动力有限元分析模型,开展平面直线形式和曲线形式护栏的碰撞安全性能仿真研究。研究结果表明:1)高速公路护栏改造采用钢-混结构组合式桥梁护栏方案可满足1.5 t小客车、14 t大客车和25 t大货车阻挡功能和导向功能要求;2)不同类型护栏碰撞安全性能评价应慎重考虑实际路段的直线、凸曲线和凹曲线等不同平面线形对车辆碰撞响应的影响;3)初始碰撞点在护栏横梁跨径上不同相对位置等参数变化对车辆-护栏碰撞动力响应有显著影响,碰撞点位于相邻立柱之间横梁1/2跨时对应的动力响应相对最大。Aimed at the combined bridge barrier design in the rehabilitation of expressway barriers,the nonlinear dynamic FEM analysis models for vehicle-barrier impacts were built,and the impact safety performances of barriers with different horizontal alignments including straight lines and circular curves were simulated.The simulation results show that:1)The steel-concrete combined bridge barrier design for the rehabilitation of expressway barriers could meet the requirements of containment performance and redirective performance for such different vehicles as the 1.5 t car,the 10t bus and the 25 t truck:2)For the safety performance evaluation of the combined bridge barrier,the effects of realistic highway section′s different horizontal alignments,such as the straight line,the convex curve and the concave curve,on the vehicle-barrier impact dynamic responses,should be carefully considered;3)The different initial impact positions relative to the barrier railing spans have significant effects on the vehicle-barrier impact dynamic responses,where the case of the impact position at the midspan between 2 adjacent barrier posts usually corresponds to the biggest dynamic responses.

关 键 词：高速公路 组合式桥梁护栏 安全性能 初始碰撞位置 平面线形 

分 类 号：U443.7[建筑科学—桥梁与隧道工程]