通载浮桥动态位移的测试方法与数据分析

Testing Method and Data Analysis of Moving-Load-Induced Dynamic Displacements of Floating Bridges

通载浮桥的动态位移,由于其位移幅度相对于固定桥要大得多,而且其垂向位移是由结构变形、间隙变化以及吃水变化等多种因素引起,一般难以对其进行动态位移测试。介绍了一种通载浮桥动态大位移的简易测试方法。该方法基于利用数字摄像技术对浮桥多点的动态位移进行实时跟踪记录,将记录结果采集到计算机,通过人工读取的方式获取各测点在各时刻的位移数据。通过对实际测量结果进行的数据分析,表明了本文介绍的测试方法简便可行,能满足精度要求。

It is difficult to test the moving-load-induced dynamic vertical displacement of a floating bridge, because the vertical displacement of a floating bridge consists of the contributions from the structural deformation, the variations of the gaps between the pontoons and the variation of the draught, and it is much larger than that of an immovable bridge. The testing method of the moving-load-induced large dynamic displacement of a floating bridge is introduced in this paper, which is based on the track records of the dynamic displacement of multipoints of the floating bridge in time domain by using the digital vidicon. The record results are thansfered into the computer and the manpower read method is used to obtain the vertical displacements of multipoints at each time. The analysis of the testing results shows the feasibility of the testing method and the creditability of the testing results.