A bridge cable monitoring method and system based on an optimized tension chord model

Abstract

Provided are an optimized tensioned cord model-based method and system for monitoring a bridge cable. The method comprises: selecting a steel cable having the same specification as a bridge cable to be measured to construct a residual function of the Newton-Gauss method, performing an iterative solution on the residual function of the Newton-Gauss method to obtain an optimal eigenfrequency order of the residual function of the Newton-Gauss method and an optimal flexural rigidity of the steel cable, and optimizing a tensioned cord model according to a result of the iterative solution; obtaining a theoretical eigenfrequency according to a theoretical tension value of the bridge cable and the optimized tensioned cord model; obtaining a vibration spectrum of the bridge cable according to a signal collected by an acceleration sensor node, and performing filtering on the obtained vibration spectrum to obtain a frequency matching the optimal eigenfrequency order and serving as a measured eigenfrequency; and determining, by the acceleration sensor node, and according to the size of the ratio between the theoretical eigenfrequency and the difference between the measured eigenfrequency and the theoretical eigenfrequency, whether to transmit collected data to a host computer monitoring center and to adjust a sampling frequency of the acceleration sensor. The method for monitoring a bridge cable has a low error rate, attains a balance between analysis accuracy and power consumption, and can be widely applied in the field of bridge monitoring.

Description

technical field [0001] The invention relates to the field of bridge monitoring, in particular to a bridge cable monitoring method and system based on an optimized tension chord model. Background technique [0002] Bridge cables are important stress-bearing components of bridge structures such as cable-stayed bridges and suspension bridges. The cable force value of the bridge cable is an important indicator for evaluating the state of the bridge. The measurement of the cable force value has also become an important part of the bridge cable monitoring system. . At present, there are many methods for measuring the force value of bridge cables, among which the spectrum vibration method, which has the advantages of simplicity and non-destructiveness, has been widely used. The spectral vibration method mainly uses the acceleration sensor to measure the tension of the bridge cable, and obtains the vibration frequency of the bridge cable by obtaining the acceleration of the acceler...

AI Technical Summary

Problems solved by technology

[0004] (1) The tension of the bridge cable is obtained directly by using the traditional tensioned chord model, ignoring the influence of the bending stiffness, and the error is relatively large;

[0005] (2) The acceleration sensor needs to send all the collected signals to the host computer monitoring center, which increases the power consumption of the sensor node; and the sampling frequency of the acceleration sensor is a fixed value manually selected, and the low sampling rate will reduce the resolution of the collected signal. Affects the analysis of data, and the high sampling rate will increase the power consumption of the sensor node, and it is impossible to balance the analysis accuracy and power consumption at the same time

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