Bridge Weigh-in-Motion

提出的研究计划的主要目标是开发一种新的桥梁运动称重（BWIM）系统来计算车辆参数，如卡车速度和车辆总重。在实际的桥梁设计规范中，设计活载应以实际交通荷载为基础。过去，有关公路桥梁实际交通负荷的信息是从卡车调查中获得的，其中卡车被停下来测量并在“静态”称重秤上称重。在过去的几十年里，有关卡车装载的信息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，公路桥梁用于对卡车进行动态称重；后一种系统称为桥梁WIM （BWIM）系统，安装在路面上的系统简称WIM系统。在过去的几十年里，已经引入了许多BWIM系统，这些系统在预测卡车的轴和车辆总重量方面具有不同程度的精度。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，比BWIM系统更昂贵，通常被认为比BWIM系统更准确。在这个拟议的研究计划中开发的BWIM技术的准确性将通过在马尼托巴的一座桥梁上进行一些现场校准测试来确定。疲劳分析是评价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，由于交通车辆的负载与设计负载相差很大。为了更准确地估计剩余疲劳寿命，需要一种改进的评估载荷程序。本研究的目标之一是将BWIM技术纳入结构健康监测（SHM）数据分析，以了解桥梁的性能，并建立梁和甲板的疲劳寿命。

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.