移动荷载变速对斜拉桥纵向共振响应影响研究  

Study on Influence of Moving Loads at Variable Speed on Longitudinal Resonance Response of Cable⁃stayed Bridge

作　　者：吕龙[1,2] 余帅 LYU Long;YU Shuai(College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;National Key Laboratory of Bridge Safety and Resilience,China Merchants Chongqing Communications Technology Research&Design Institute Co.Ltd.,Chongqing 400067,China)

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]招商局重庆交通科研设计院有限公司桥梁工程安全与韧性全国重点实验室,重庆400067

出　　处：《铁道建筑》2025年第3期58-66,共9页Railway Engineering

基　　金：国家自然科学基金(52108113,12032008);重庆市博士后特别资助(2022CQBSHTB2014);桥梁工程结构动力学国家重点实验室开放基金(202204)。

摘　　要：以一座大跨度铁路斜拉桥为背景,建立桥梁动力有限元分析模型,分析桥梁结构动力响应随移动荷载速度的变化规律,得到变速效应对桥梁结构动力响应影响规律。研究移动荷载数量对斜拉桥纵向振动响应的影响,讨论黏滞阻尼器对斜拉桥纵向动力响应及减振效果的影响。结果表明:移动竖向荷载导致的斜拉桥纵向振动响应不能忽视,不同加速度的移动荷载作用下斜拉桥均出现纵向共振现象,移动荷载变速过桥对共振速度影响显著;移动荷载数量对主梁位移随速度变化规律的影响不显著;设置黏滞阻尼器的斜拉桥纵向共振现象受到抑制,黏滞阻尼器对主梁纵向位移减振效果显著。With a long-span railway cable-stayed bridge as the background,the finite element model for the dynamic analysis of the cable-stayed bridge was established.The change rule of the dynamic response of bridge with the speed of moving loads was analyzed.And the influence of the variable speed effect on the dynamic response of bridge was obtained.The influence of the number of moving loads on the longitudinal vibration response of cable-stayed bridge was investigated.The influence of the viscous damper and the effect of viscous dampers on the longitudinal vibration reduction of the cable-stayed bridge was discussed.The results show that the longitudinal vibration response of the cablestayed bridge caused by moving vertical loads cannot be ignored.The longitudinal resonance phenomenon of the cablestayed bridge occurs under moving loads with different accelerations.The influence of moving loads that drive across the bridge at variable speeds on the resonant speed is significant.And the influence of the number of moving loads on the variation in the longitudinal displacement of the deck with the speed is insignificant.By installing viscous dampers,the longitudinal resonance phenomenon of cable-stayed bridges is suppressed,and the unfavorable effects of variable speeds of moving loads on the bridge can be controlled.The effectiveness of viscous dampers in reducing the longitudinal displacement of the bridge deck is significant.

关 键 词：铁路桥梁 纵向共振 数值计算 移动荷载 黏滞阻尼器 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]