不同交通流状态下简支梁桥动力响应研究
Research on Dynamic Response of Simply-supported Beam Bridge under Different Traffic Flow States
李路遥 1董姣姣 1李华腾2
作者信息
- 1. 黄河交通学院 经济管理学院,河南 焦作 454950
- 2. 太原科技大学 车辆与交通工程学院,山西 太原 030024
- 折叠
摘要
为了解交通流状态对桥梁动力响应的影响,根据道路服务水平,选择车头间距与车速作为交通流状态评价指标,选用两轴平面整车车型,基于模态综合法,建立多车车桥耦合振动分析模型,分析不同交通流状态下简支梁桥的动力响应.结果表明,当车辆达到3辆时,桥梁跨中最大竖向位移最大,车辆增加到5辆时,桥梁跨中最大竖向位移趋于稳定;当车辆之间的距离增加时,车辆之间的叠加动力效应减弱,桥梁跨中最大竖向位移逐渐减小并接近单车下的数值;在不同交通流状态中,稳定流对桥梁动力响应的影响最小,限制流对桥梁动力响应影响最大.
Abstract
In order to understand the influence of traffic flow state on the dynamic response of bridge,according to the road service level,the space headway and vehicle speed are selected as the evaluation indexes of traffic flow state and the two-axle plane vehicle model is selected to establish the multi-vehicle vehicle-bridge coupling vibration analysis model to analyze the dynamic response of simply-supported beam bridge under different traffic flow states based on the modal synthesis method.The results show that when the number of vehicles reaches 3,the maximum vertical displacement in the middle of the bridge span is the largest,when the number of vehicles increases to 5,the maximum vertical displacement in the middle of the bridge span tends to be stable;when the distance between vehicles increases,the superimposed dynamic effect between the vehicles is weakened,and the maximum vertical displacement in the middle of the bridge span gradually decreases and approaches the value under the single vehicle;in different traffic flow states,the steady flow has the least influence on the dynamic response of the bridge,and the restricted flow has the greatest influence on the dynamic response of the bridge.
关键词
车桥耦合/动力响应/多车荷载/交通流Key words
vehicle-bridge coupling/dynamic response/multi-vehicle load/traffic flow引用本文复制引用
基金项目
黄河交通学院校级教科研项目(Hhjt-2023048)
黄河交通学院校级课程资源库(HHJTXY-2023kczyk17)
出版年
2024
NETL
NSTL
万方数据