桥上列车移动荷载参数自动识别系统试验

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

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。

A new system for moving- train load- parameters identification was presented and experimentally studied based on a simply supported steel beam with constant cross-sections subjected to moving train loads. The dynamic displacement responses at the measurement points of the bridge were simultaneously measured by using the displacement image-processing monitoring system. Basic parameters of the model train, including moving speed, axle number and axle spacing,were identified with a parameter acquisition system. Finally, the moving train loads were identified by using multi-axle moving-loads identification system. Effects of parameters identification for different moving speeds and measurement points of the proposed system were investigated. The feasibility and accuracy of this system for moving-train load parameters identification were verified. This work may provide a base for practical application of the load identification system.