Bridge Weigh-in-Motion

拟议研究计划的主要目标是开发一种新的桥梁动态称重(BWIM)系统，以计算卡车速度和车辆总重等车辆参数。在实际桥梁设计规范中，设计活荷载应以实际交通荷载为基础。过去，有关公路桥梁实际交通荷载的信息是通过卡车调查获得的，在这种情况下，卡车被停下来进行测量，并在静态称重秤上称重。在过去的几十年里，关于卡车负载的信息都是在卡车以正常速度行驶时收集的。一些动态称重(WIM)秤安装在路面上。在其他WIM系统中，公路桥用于卡车的动态称重；后者称为桥梁WIM(BWIM)系统，安装在路面上的系统简称为WIM系统。在过去的几十年里，已经引入了一些BWIM系统，它们在预测卡车的车轴和车辆总重方面具有不同程度的准确性。决定选择合适的BWIM系统的两个重要因素是其成本和预测的准确性。路面WIM系统总是专有的，而且比BWIM系统更昂贵，通常被认为比BWIM系统更准确。在这项拟议的研究计划中开发的BWIM技术的准确性将通过对马尼托巴省一座桥梁的大量现场校准测试来确定。疲劳分析是评估桥梁健康状况的重要考虑因素。要进行疲劳分析，载荷和阻力是两个基本问题。事实上，交通车辆产生的荷载与设计荷载相差很大。为了更准确地估计剩余疲劳寿命，需要一种改进的载荷评估程序。本研究的目标之一是将BWIM技术引入结构健康监测(SHM)数据分析中，以了解桥梁的性能并确定主梁和桥面的疲劳寿命。

The main objective of the proposed research program is to develop a new bridge Weigh in Motion (BWIM) system to calculate vehicle parameters such as truck speed and gross vehicle weight. In a realistic bridge design code, the design live loads should be based on actual traffic loads. In the past, the information about the actual traffic loads on highway bridges was obtained from truck surveys, in which the trucks are stopped for measurement and weighed on 'static' weighing scales. During the past few decades, the information about the truck loads has been collected while the trucks are moving at normal speeds. Some of the weighing-in-motion (WIM) scales are installed in the pavement. In other WIM systems, a highway bridge is used for the weighing-in-motion of the trucks; this latter system is referred to as the bridge WIM (BWIM) system, and the system installed in the pavement as simply the WIM system. Over the past few decades, a number of BWIM systems, with varying degrees of accuracy in predicting the axle and gross vehicle weights of the trucks, have been introduced. Two important factors in deciding upon the selection of an appropriate BWIM system are its cost and the accuracy of its prediction. The pavement WIM systems, invariably proprietary and more expensive than the BWIM systems, are usually assumed to be more accurate than the BWIM systems. The accuracy of the BWIM technology developed in this proposed research program will be established through a number of field calibration tests on a bridge in Manitoba.Fatigue analysis is an important consideration for evaluating the health of the bridges. To develop a fatigueanalysis, load and resistance are two essential concerns. In fact, the load due to a traffic vehicle differs considerably from the designed load. To estimate the remaining fatigue life more accurately, a refined evaluation load procedure is desirable. One of the goals of this research is to incorporate BWIM technology into Structure Health Monitoring (SHM) data analysis to understand the performance of the bridges and establish fatigue life of the girders and the decks.