Fatigue Performance of Steel-Concrete Composite Beams Under Vehicle Loads  

车辆荷载作用下钢混组合梁的疲劳性能

作　　者：WANG Jiansheng ZHANG Jianmeng JIA Yumeng 王建省;张建猛;贾玉梦(北方工业大学土木工程学院,北京100144)

机构地区：[1]School of Civil Engineering,North Polytechnic University,Beijing 100144,China

出　　处：《吉首大学学报(自然科学版)》2025年第2期51-57,共7页Journal of Jishou University(Natural Sciences Edition)

摘　　要：In order to more accurately calculate the fatigue damage and fatigue life of steel-concrete composite beam under standard vehicle load,the steel beam components of a large-span steel-concrete composite beam suspension bridge were taken as the research object.Based on the S-N curve and linear fatigue damage theory,a standard segment model was established.Accordingly,the welding position of the secondary longitudinal beam was identified as the focus fatigue point,and the stress time course calculation was done for the point.The results showed that when the vehicle mass increases from 50 t to 100 t,the amount of fatigue damage will increase by more than 5 times in the same period of time,and the increase in the vehicle mass will reduce the fatigue life of the bridge structure.The fatigue damage of bridge structures increases with the increase of vehicle speed.The increase rate of fatigue damage is greater at low speeds,and the increase rate of fatigue damage slows down at high speeds.为了准确计算标准车辆荷载下钢混组合梁的疲劳损伤度及疲劳寿命,以某大跨钢混组合梁悬索桥的钢梁构件为研究对象,基于S-N曲线和线性疲劳损伤理论构建了标准节段模型,确定了次纵梁焊接位置为疲劳关注点,并对关注点进行了应力时程计算.研究结果表明,当车质量从50 t增加到100 t时,相同时间内疲劳损伤量会增加5倍以上,行车质量增加会降低桥梁结构的疲劳寿命;桥梁结构的疲劳损伤量随着车速的增加而增加,车速低时疲劳损伤量的增加速率较大,车速高时疲劳损伤量的增加速率较小.

关 键 词：steel-concrete composite beam vehicle load FATIGUE 

分 类 号：TU441.2[建筑科学—岩土工程]