基于实测的公路桥梁车辆荷载统计模型

基于动态称重系统获取的运营交通基本信息,依据轴组类型对所有车辆进行分类及筛选,建立了6种主要车型的车重、车距、车道交通量、轴重与轴距的统计模型,然后按损伤等效原则提供了6种车型的等效模型车辆,为桥梁疲劳可靠性评估提供了实用的车辆荷载模型.研究表明该建模方法能够准确描述交通荷载,建模过程与方法对同类问题具有普遍意义,可应用于建立各种交通状况下的疲劳车辆荷载模型或提供参考.

Statistic Model of Vehicle Loads for Highway Bridges

Fatigue traffic loads is the basic issue for fatigue design of new bridges and assessment of remaining fatigue life and service safety of aging bridges. This study was based on the information of operational traffic obtained from Weight in Motion (WIM) monitoring. First, according to number of axles and wheelbase, all the vehicles were divided into 14 types out of which 6 types were selected as the chief types of fatigue traffic loads. Then, the statistic distributions of characteristics of traffic-flow, including vehicle weight, vehicle spacing, traffic volume allocated to each lane, axle weight and wheelbase, were studied. Finally, vehicle loads models for the 6 types of vehicles mentioned above were derived from the distribution of axle weight and wheelbase based on the principle of equivalent fatigue damage. The models and the methodology proposed were applicable to similar conditions of fatigue traffic load study.