特重车交通荷载作用下大跨拱桥动力响应分析

发布时间：2019-06-04 04:40

【摘要】：为研究特重车交通荷载工况作用下大跨拱桥的动力响应特点,以河北省宣大高速公路上某大桥的动态称重系统所采集的近3年的交通数据为基础,定义并提取了特重车的交通荷载工况,进而分析了不同类型特重车交通荷载工况所占比例及每个特重车交通荷载工况车辆总质量的分布规律。利用随机车流-桥梁耦合振动分析软件计算了大跨拱桥在特重车交通荷载作用下的空间动力响应,并与新旧桥梁规范中的设计车辆荷载对应的响应进行了对比。结果表明:新规范对拱桥关键部位的设计荷载定义更为保守,实测的交通荷载工况中仅有极少数特重车交通荷载工况对应的响应超过了设计车辆荷载对应的响应;对于该大跨拱桥,新桥梁规范中的设计车辆荷载能够较充分地考虑大部分特重车交通荷载作用对桥梁结构整体受力产生的不利影响。
[Abstract]:In order to study the dynamic response characteristics of long-span arch bridge under the action of special heavy vehicle traffic load, the traffic data collected by the dynamic weighing system of a bridge on Xuan Da Expressway in Hebei Province in recent 3 years are based on the traffic data collected by the dynamic weighing system of a bridge on Xuan Da Expressway in Hebei Province. The traffic load conditions of special heavy vehicles are defined and extracted, and then the proportion of different types of heavy vehicles under traffic load conditions and the distribution law of the total mass of vehicles under each special heavy vehicle traffic load condition are analyzed. The spatial dynamic response of long-span arch bridge under special vehicle traffic load is calculated by using random traffic flow-bridge coupling vibration analysis software, and the response of long-span arch bridge under special heavy vehicle traffic load is compared with that of the design vehicle load in the old and new bridge code. The results show that the definition of the design load of the key parts of the arch bridge is more conservative in the new code, and only a very small number of the response of the traffic load condition of the special heavy vehicle exceeds the response of the design vehicle load in the measured traffic load condition. For the long-span arch bridge, the design vehicle load in the new bridge code can fully consider the adverse effects of most heavy vehicle traffic loads on the overall stress of the bridge structure.
【作者单位】：长安大学公路学院;
【基金】：国家自然科学基金项目(51278064)
【分类号】：U448.22;U441

【参考文献】