Bridge cable monitoring method based on optimized tensioning string model and bridge cable monitoring system thereof

Abstract

The invention discloses a bridge cable monitoring method based on an optimized tensioning string model and a bridge cable monitoring system thereof. The method comprises the steps that a steel cable having the same specification with the actually measured bridge cable is selected to construct the residual function of the Gauss-Newton method, then iterative solving is performed on the residual function of the Gauss-Newton method and the optimal eigen-frequency order number and the optimal steel cable flexural rigidity of the residual function of the Gauss-Newton method are obtained, and finally the tensioning string model is optimized according to the result of iterative solving; the theoretical eigen-frequency is solved; the vibration spectrum of the bridge cable is obtained, and then the frequency meeting the optimal eigen-frequency order number is selected from the obtained vibration spectrum to act as the actually measured eigen-frequency through screening; and an acceleration sensor node determines transmitting of acquisition data and sampling frequency for adjusting the acceleration sensor to an upper computer monitoring center according to the size of the ratio of the difference value of the actually measured eigen-frequency and the theoretical eigen-frequency to the theoretical eigen-frequency. The bridge cable monitoring method is low in error and considers analysis of both accuracy and power consumption so that the bridge cable monitoring method can be widely applied to 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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