栅式电涡流传感器在桥梁挠度测量中的应用

Estimation of Bridge Deflection Using Grating Eddy Current Sensors

根据桥梁变形的特点提出了一种三点测量法的梁体挠度测量新方法,在沿着桥梁轴线方向上等间隔选取测量点,令每3个相邻的测点为一个测量单元,通过安装在这些测量单元中的栅式电涡流位移传感器可测量得到该单元中间测点相对于两个端点连线的相对挠度,而后可根据这些相对挠度计算出每个测点绝对挠度值;为了验证该方法的有效性,通过在简支梁模型上进行的一系列静态、动态挠度测量实验证明了该方法准确、稳定可靠。

A three--point method for bridge deflection estimation is proposed. Measuring points are selected along the span axis, and every three adja- cent measuring points are defined as a measuring unit. In each measuring unit, the displacement of the mid--measuring point relative to the reference line linking the other two measuring points measured by the grating eddy current sensor is defined as the relative deflection. Deflections of each measuring point can thus be calculated from the relative deflections of all the measuring units directly. Both static and dynamic experiments have been carried out on a simple beam bridge model. The experimental results demonstrate this method is precise and effective.