Cable force estimation of a long‐span cable‐stayed bridge with microwave interferometric radar

Abstract

Since cables are the critical structural components for ensuring the overall structural integrity and safety of cable-stayed bridges, the portable and rapid cable force measurement has a very important practical significance in the bridge health monitoring. In this paper, a method of simultaneous and continuous estimation of the forces of multiple cables using a self-developed microwave interferometric radar was proposed. In the proposed approach, first, the time-varying modal frequencies are identified by the Hilbert transform algorithm from the displacements of multiple cables, which are monitored by the self-developed radar, and then, the time-varying cable forces are obtained by the vibration method. In addition, for the problem of multiple cables located in the same range bin when distance test or the test angle is nonideal, a singlechannel blind source separation algorithm based on vibrational mode decomposition (VMD) and time-frequency analysis was proposed to separate the cable signals. Furthermore, a method based on the spectrum correlation coefficients was proposed to determine the number of decomposition layers in VMD. The "Nanjing Eye" cablestayed footbridge was used to conduct field measurement to validate the proposed method. Field measurement results show a good agreement with reference measurements, which demonstrate that the proposed method can perform well in an actual project for portable and rapid cable force estimation. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Vision-Based Cable Displacement Measurement Using Side View Video

“…estimated the cable tension force of cable-stayed bridge cables using a stress sensor with the elasto-magnetic (EM) effect of ferromagnetic materials [7]. Zhao et al also used microwave intrametric radar to measure the displacement of the Nanjing Eye cable-stayed bridge and estimate the tension force [8]. Most of these studies required the measurement of cable displacement either directly or indirectly.…”

Noncontact deflection measurement for bridge through a multi‐UAVs system

“…To conquer the limitations of those conventional methods, stationary and remote measurement methods have been developed (Park et al, 2015;Tian et al, 2019;Zhao et al, 2020). Ye et al (2013) calculated the deflection variation of structure through pattern matching algorithm, by cross-correlation analysis between the captured images and predefined image.…”

“…To conquer the limitations of those conventional methods, stationary and remote measurement methods have been developed (Park et al., 2015; Tian et al., 2019; Zhao et al., 2020). Ye et al.…”

A Bayesian smoothing for input‐state estimation of structural systems

“…In many real‐life structural system identification applications, the measurement of inputs is costly or even not feasible at all, such as the axle loads of trains and vehicles and the wind loads on buildings and wind turbines. This motivated research on output‐only Bayesian filters to indirectly estimate the dynamic forces acting on the structural system (Tian et al., 2020; Zhao et al., 2020). A load reconstruction method based on the KF was proposed by Zhi et al.…”