桥上列车移动荷载参数自动识别系统试验

提出了一种用于列车移动荷载参数自动识别的系统,并制作了等截面简支钢梁和试验列车模型进行试验研究。利用基于图像处理技术的桥梁动态位移采集系统,获取模型桥梁测点位置的动态位移响应,同时利用自行设计的列车模型参数采集系统获取列车模型的移动速度、轮轴个数和轴间距,最后采用桥梁列车多轴移动荷载识别系统识别出列车轴重荷载值。通过对不同移动速度、不同测点个数下列车参数识别效果的分析,验证了本文所述列车移动荷载参数自动识别系统的可行性和准确性,为今后荷载识别系统的实际应用做好准备。

Experimental Study on Automatic Identification of Moving Train Load Parameters of Bridges

A new system for moving train load parameters identification is presented and experimental studies are proceed based on a simply supported steel beam with uniform cross-section and moving train model. The time history displacements of measurement stations on bridge are simultaneously measured by using displacement image processing monitoring system. Basic parameters of the model train, including moving speed, axle numbers and axle spacing, are identified with a parameter acquisition system. Finally moving train loads are identified by using multi-axle moving loads identification system. Effects of parameters for different moving speeds and measurement stations on the proposed system are investigated. The result shows that this system is a feasible and accurate method for moving train load parameters identification and makes preparations for the practical application.