基于长期监测的特重车交通荷载特性及动态过桥分析

发布时间：2019-06-04 05:15

【摘要】：为了获取特重车交通荷载特性以及对特重车过桥所产生的桥梁动力响应和桥梁安全进行分析,从河北宣大高速公路某大桥安装的健康监测系统实时记录的3年交通荷载数据库中,定义并提取了1 319个特重车交通荷载工况,记录的荷载信息包括车型、车速、车质量、车长、行驶车道和车辆到达时刻,对特重车交通荷载样本进行统计分析从而获得各参数特征。以一座6跨连续T梁桥为例,利用自主研发的BDANS软件中的随机车流-桥梁耦合振动分析模块,计算了特重车交通荷载作用下桥梁的空间动力响应,并与考虑冲击效应的公路Ⅰ级设计荷载对应响应进行对比。研究结果表明:少量特重车工况下桥梁强度超限,超限工况主要为单辆特重车过桥工况,最大超限率达到15%。
[Abstract]:In order to obtain the traffic load characteristics of the special heavy vehicle and analyze the dynamic response and bridge safety of the bridge caused by the special heavy vehicle crossing the bridge, From the 3-year traffic load database recorded in real time by the health monitoring system installed on a bridge of Xuan Da Expressway in Hebei Province, 1319 traffic load conditions of special heavy vehicles are defined and extracted. The recorded load information includes vehicle type, speed and vehicle quality. The traffic load samples of heavy vehicles are statistically analyzed to obtain the characteristics of each parameter. Taking a 6-span continuous T-beam bridge as an example, the spatial dynamic response of the bridge under the action of special heavy vehicle traffic load is calculated by using the coupling vibration analysis module of random traffic flow and bridge in BDANS software developed by ourselves. The corresponding response of grade I design load considering impact effect is compared with that of highway grade I design load considering impact effect. The results show that the bridge strength exceeds the limit under the condition of a small number of special heavy vehicles, and the overrun condition is mainly the bridge crossing condition of a single special heavy vehicle, and the maximum overrun rate is up to 15%.
【作者单位】：长安大学陕西省公路桥梁与隧道重点实验室;同济大学道路与交通工程教育部重点实验室;
【基金】：国家自然科学基金项目(51278064) 中央高校基本科研业务费专项资金项目(2013G2211002)
【分类号】：U441.2

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