城市轨道交通钢桥疲劳损伤等效系数研究  

STUDY OF DAMAGE EQUIVALENT FACTORS OF URBAN RAIL TRANSIT STEEL BRIDGE

作　　者：王春生[1] 徐有良 赵会东 张培杰[1] WANG Chun-sheng;XU You-liang;ZHAO Hui-dong;ZHANG Pei-jie(School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China;China Railway Economic and Planning Research Institute,Beijing 100844,China)

机构地区：[1]长安大学公路学院,陕西,西安710064 [2]中国铁路总公司工程设计鉴定中心,北京100844

出　　处：《工程力学》2020年第2期62-69,共8页Engineering Mechanics

基　　金：中铁第一勘察设计院集团有限公司科研开发项目(院科15-11);国家“万人计划”科技创新领军人才支持项目(W03020659)

摘　　要：为研究城市轨道交通钢桥疲劳损伤等效系数,根据Eurocode中S-N曲线和损伤等效系数法,对中国城市轨道交通钢桥疲劳损伤等效系数进行求解分析。提出6种适用于中国城市轨道交通钢桥的列车编组,选取ZC、ZK和LM71这3种荷载图式作为疲劳荷载模型。根据中国城市轨道交通的实际交通量,提出1种采用双斜率S-N曲线的简化算法,与采用单斜率S-N曲线求解方法进行对比分析。求解分析各项疲劳损伤等效系数,并针对中国城市轨道交通钢桥列车编组的特点提出考虑列车最大容许速度影响的损伤等效系数v。结果表明:以ZC图式作为疲劳荷载模型,考虑列车最大容许速度的影响,依据双斜率S-N曲线简化算法求得的损伤等效系数较能合理地对中国轨道交通钢桥进行疲劳验算。To study the damage equivalent factors of urban rail transit steel bridge,the factors of Chinese urban rail transit steel bridge are analyzed based on the S-N curve and damage equivalent factor method in Eurocode.Six traffic types of urban rail transit applied to Chinese urban rail transit steel bridge are proposed,and three load diagrams,ZC,ZK and LM71,are selected as fatigue load models.According to the actual traffic volume of Chinese urban rail transit,a simplified calculation method using bi-linear S-N curve is proposed,which is compared with the methods using single slope S-N curve.Thus,damage equivalent factors of urban rail transit steel bridge are analyzed.To consider the characteristics of Chinese urban rail transit,an equivalent factor v c onsidering the maximum permitted vehicle speed is proposed.The results demonstrate that by taking diagram ZC as fatigue load model and considering influence of the maximum permitted vehicle speed,the damage equivalent factors based on the simplified bi-linear S-N calculation method can be reasonably applied to fatigue verification of Chinese urban rail transit steel bridge.

关 键 词：城市轨道交通钢桥 损伤等效系数 疲劳验算 疲劳荷载模型 列车最大容许速度 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U442.52[交通运输工程—道路与铁道工程]