基于基准传递原理的桥梁挠度测试方法及试验研究

以基准传递原理为基础并结合桥梁挠度变形特点,提出了一种通过在梁体上布设连续连杆的挠度测试的新方法。为验证该方法,进行了一个空心板梁在温度及动载作用下的挠度测试试验,试验过程中测试了连杆中部与梁体的相对位移时程曲线,并对测试结果进行了加汉明窗的滤波得到了温度效应产生的梁体各测点的挠度变化值。结果表明依据基准传递原理进行桥梁挠度测试可以精确地同时对静、动态挠度进行测试,并能很方便的对单因素作用下的挠度进行分离,从而为桥梁的安全性评价和挠度长期健康监测提供可靠的数据。

The method and the filed test research for bridge deflection measurement based on the principle of datum transfer

A new method based on the principle of datum transfer for bridge deflection measurement is presented in the paper. To verify the presented method,tests for deflection measurement on a hollow beam are carried out,and the signal given by the displacement sensors permits an efficient filtering of the results,thus eliminating the effect of dynamic deformation the measurements.The result showed that the developed system on datum transfer can be used for bridge deflection test in static and dynamic conditions,and can separate the integrate response of the deflection caused by different effects easily,which provides a dependable basis for bridge safety evaluation and long-term deflection monitoring and safety evaluation of existing bridge.