高墩大跨连续刚构桥梁动力冲击系数研究  

Dynamic impact coefficient of high pier large-span continuous rigid frame bridge

作　　者：韦倩 覃亮 王宁波[1] 户东阳 WEI Qian;QIN Liang;WANG Ningbo;HU Dongyang(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Development and Investment Group Co.,Ltd.,Kunming 650200,China;China Railway 2nd Research Institute Kunming Survey&Design Institute Co.,Ltd.,Kunming 650200,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中铁开发投资集团有限公司,昆明650200 [3]中铁二院昆明勘察设计院有限责任公司,昆明650200

出　　处：《振动与冲击》2025年第7期209-216,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(52278233);中铁开投科技研究开发计划项目(2021-B类-05)。

摘　　要：移动荷载作用下动力冲击问题与桥梁设计、运营维护密切关联,涉及桥梁结构建造经济性与服役安全性。当前的众多研究主要聚焦车辆过桥的动力放大,而单个车辆过桥行为的动力放大系数往往并不等同于桥梁设计阶段采用的动载系数。论文基于车-桥-墩耦合系统模型动力响应数值仿真计算,给出桥梁动力冲击系数(bridge impact factor,BIF)的定义和计算方法。针对某高墩大跨梁桥,开展BIF计算和影响因素研究,分析限行速度、路面平整度等对BIF的影响。结果表明:BIF是与桥梁状态相关的固有特征参数,和桥梁的容许荷载、限行速度、路面平顺性等因素密切相关;BIF随着限行速度增大而增大,但当限行速度超过最不利速度时,BIF则保持不变;路面不平度对BIF有更显著的影响,随着路面不平度的增加,BIF进一步放大;当桥面发生恶化时,可以实施桥面铺装修复或限速限载来确保BIF在允许范围内。该研究揭示了桥梁BIF取值及衍化规律,可为同类型桥梁设计及运维管理提供指导与参考。Dynamic impact problem under action of mobile load is closely related to bridge design,operation and maintenance,it involves economy and service safety of bridge structure construction.Many current studies mainly focus on dynamic amplification of vehicles crossing bridge,and dynamic amplification factor of a single vehicle crossing bridge behavior is often not equivalent to dynamic load factor used in bridge design stage.Here,based on numerical simulation calculation of dynamic response of a vehicle-bridge-pier coupled system model,the definition and calculation method of bridge impact factor(BIF)was given.BIF calculation and influencing factors study were performed for a high pier large-span beam bridge to analyze effects of restricted speed,road surface smoothness and other factors on BIF.The results showed that BIF is an inherent characteristic parameter related to bridge state,and it is closely related to factors of allowable load,restricted speed and road smoothness of bridge;BIF increases with increase in restricted speed,but remains unchanged when restricted speed exceeds the most unfavorable speed;road surface unevenness has a more significant impact on BIF,with increase in road surface unevenness,BIF further is amplified;when bridge deck deteriorates,bridge deck pavement repair or speed and load limiting can be implemented to ensure BIF being within the allowable range;the study reveals value-taking and evolution laws of bridge BIF,and can provide guidance and reference for design,operation and maintenance management of similar bridges.

关 键 词：高墩桥梁 动力冲击系数 车辆过桥 数值计算 

分 类 号：TV45[水利工程—水工结构工程]