公轨两用桥钢混结合段的疲劳荷载参数研究

摘要

This paper introduces the method to determine fatigue load parameters of rail traffic in mixed steel joint sections of Caiyuanba Bridge. Based on assumption that meeting of light rail vehicles complies with normal distribution, this method makes statistics of amplitude of internal force of fatigue of mixed steel joint structures caused by rail traffic by means of rain-flow counting, and then converts it into equivalent constant-amplitude fatigue load convenient for experimental study in accordance with Miner linear cumulative damage criterion. This method can provide a reference for design and research of similar bridges.%介绍菜园坝大桥钢混结合段轨道交通疲劳荷载参数确定方法.该方法基于轻轨车辆相遇符合正态分布的假设,采用雨流计数法统计出轨道交通造成钢混接头结构的疲劳内力幅值,然后按照Miner线性累积损伤准则等效成便于试验研究的等幅疲劳荷载.该方法可为同类桥梁设计和研究提供参考.