Multi-type sensor placement and response reconstruction for structural health monitoring of long-span suspension bridges

Abstract

This study is devoted to the experimental validation of the multi-type sensor placement and response reconstruction method for structural health monitoring of long-span suspension bridges. The method for multi-type sensor placement and response reconstruction is briefly described. A test bed, comprising of a physical model and an updated finite element (FE) model of a long-span suspension bridge is also concisely introduced. The proposed method is then applied to the test bed; the equation of motion of the test bed subject to ground motion, the objective function for sensor location optimization, the principles for mode selection and multi-type response reconstruction are established. A numerical study using the updated FE model is performed to select the sensor types, numbers, and locations. Subsequently, with the identified sensor locations and some practical considerations, fiber Bragg grating (FBG) sensors, laser displacement transducers, and accelerometers are installed on the physical bridge model. Finally, experimental investigations are conducted to validate the proposed method. The experimental results show that the reconstructed responses using the measured responses from the limited number of multi-type sensors agree well with the actual bridge responses. The proposed method is validated to be feasible and effective for the monitoring of structural behavior of long-span suspension bridges.

摘要

该研究致力于对所建立的大跨悬索桥结构健康监测多种传感器布置和响应重构的方法的试验验证。首先简要介绍了多种传感器布置和响应重构的方法,以及用以验证该方法的大跨悬索桥的试验模型和修正过的有限元模型。建立了试验模型在地面运动作用下的运动方程、传感器优化布置的目标函数、模态选择的准则与多种响应重构的方法。并利用修正过的有限元模型进行数值研究,确定所选择传感器的类型、数目与位置。然后,根据所确定的传感器的类型、数目与位置和一些实用性的考虑,将光纤传感器、激光位移传感器与加速度计安装在大跨悬索桥的试验模型上。最后进行了一系列的试验来验证所提出的方法。试验结果表明,基于有限数量的多种传感器所测的数据得到的重构响应与实际桥所测量的响应相吻合,从而验证了该用于监测大跨悬索桥结构健康状况的方法的可行性与有效性。