汽车荷载作用下桥梁冲击系数影响规律研究
Research on the Influence of Impact Coefficients on Bridges Under the Action of Vehicle Loads
林玉森 1石君龙 2常雄飞 2齐晓轩 2王军文2
作者信息
- 1. 石家庄铁道大学 土木工程学院,河北 石家庄 050043;道路与铁道工程安全保障教育部重点实验室(石家庄铁道大学),河北 石家庄 050043
- 2. 石家庄铁道大学 土木工程学院,河北 石家庄 050043
- 折叠
摘要
以三跨连续箱梁桥为研究对象,建立了桥梁模型和车辆模型从而组成车桥耦合动力模型,并对车辆荷载作用下桥梁结构的冲击系数进行研究分析.研究表明:增加横向车道数可以使桥梁的冲击系数增大,纵向距离越大桥梁冲击系数越小;车辆在制动状态下的桥梁冲击系数明显大于车辆匀速状态时的冲击系数,并且车辆在桥梁中跨前半部分制动时,动力冲击系数要大于后半跨;车辆在跳车冲击作用下,桥梁跨中冲击系数明显增大,且在跨中跳车时,桥梁动力冲击系数为最大.
Abstract
Taking a three-span continuous box girder bridge as the research object,a bridge model and a vehicle model are established to form a vehicle-bridge coupled dynamic model,and the impact coeffi-cient of the bridge structure under the action of vehicle load is studied and analysed.The study shows that:the number of transverse lanes increases the impact coefficient of the bridge,the greater the longi-tudinal distance the smaller the impact coefficient of the bridge;the impact coefficient of the bridge in the braking state of the vehicle is significantly greater than the impact coefficient of the vehicle at con-stant speed,and when the vehicle brakes in the first half of the bridge mid-span,the power impact coe-fficient is greater than the second half of the span;the vehicle in the jump impact effect,the impact co-efficient of the bridge mid-span increases significantly,and in the mid-span jump when the vehicle The bridge power impact coefficient is the largest.
关键词
连续箱梁桥/车桥耦合振动/动力学分析/冲击系数Key words
continuous box girder bridge/vehicle-bridge coupling vibration/dynamics analysis/im-pact factor引用本文复制引用
基金项目
河北省自然科学基金(E2019210215)
出版年
2024
NETL
NSTL
万方数据