基于车桥耦合理论的斜拉桥拉索动力冲击系数及影响因素分析  

Analysis of dynamic impact coefficients and affecting factors of stay cables in cable-stayed bridges based on vehicle-bridge interaction theory

作　　者：李子超 黎剑安 冯东明[1,2,3] LI Zichao;LI Jian’an;FENG Dongming(MOE Key Lab of Concrete and Prestressed Concrete Structures,Southeast University,Nanjing 210096,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;State and Local Joint Engineering Research Center for Intelligent Construction and Maintenance,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学混凝土与预应力混凝土结构教育部重点实验室,南京210096 [2]东南大学土木工程学院,南京211189 [3]东南大学智慧建造与运维国家地方联合工程研究中心,南京211189

出　　处：《振动与冲击》2024年第7期67-74,共8页Journal of Vibration and Shock

基　　金：中央高校基本科研业务费(3205002203A1);东南大学新进教师科研启动经费资助(RF1028623149)。

摘　　要：为了分析车辆荷载对斜拉桥拉索产生的冲击效应,以国内某在役斜拉桥和某型五轴重车作为研究对象,通过有限元方法分析不同工况下的拉索动力响应和冲击系数,将计算结果与国家现行规范进行比较,提出了拉索动力冲击系数的建议值。仿真案例考虑了车速(50~120 km/h)、路面等级(光滑、A级、B级、C级)以及车辆横向位置对结果的影响。研究结果表明:经有限元分析出的拉索动力冲击系数大于现行规范中的取值;随着路面等级的增加,冲击系数越大;边缘车道上车辆产生的冲击效应大于中间车道的冲击效应;车速变化对不同位置处的拉索动力冲击系数影响并不相同;在相同工况下,短拉索的动力冲击系数较大。研究发现路面等级是影响拉索动力冲击系数的主要因素,因此建议根据路面等级对冲击系数进行取值,具体建议值为:光滑路面取0.08,A级路面取0.15,B级路面取0.25,C级路面取0.40。Here,to analyze the impact effect of vehicle load on cables of cable-stayed bridge,a certain domestic in-service cable-stayed bridge and a certain type of 5-axle load vehicle were taken as study objects.Dynamic responses and impact coefficients of cables under different working conditions were analyzed using finite element method.The calculation results were compared with the current national standards,and recommended values for dynamic impact coefficients of cable were proposed.Effects of vehicle speeds of 50-120 km/h,road surface levels of smooth,Class A,Class B and Class C as well as vehicle lateral positions on the calculation results were considered in simulation cases.The study results showed that dynamic impact coefficients of cables obtained with finite element analysis are larger than those in current specifications;with increase in road surface level,cable impact coefficient increases;the impact effect generated by the vehicle on edge lane is larger than that on middle lane;effects of vehicle speed changes on dynamic impact coefficients of cables at different positions are not the same;under the same working conditions,dynamic impact coefficients of short cables are larger;road surface level is the main factor affecting cable dynamic impact coefficients,it is recommended to take impact coefficients according to road surface level;the specific impact coefficient values recommended are 0.08 for smooth road surface,0.15 for Class A road surface,0.25 for Class B road surface and 0.40 for Class C road surface.

关 键 词：车桥耦合系统 斜拉桥 拉索动力冲击系数 路面不平度 

分 类 号：U441[建筑科学—桥梁与隧道工程]