Accurate test method for short suspender cable force of suspender arch bridge

Abstract

The invention discloses a method for accurately measuring the cable force of a short boom of a boom arch bridge. A relevant measuring model is designed, boundary conditions of the boom are simplified into damping and spring supporting of a simple support boom in a corresponding transverse position, the boom is further equivalent into a simple support stretching rope with the equivalent calculation length, a mass block is additionally arranged in the middle of the boom, a vibration balance equation of ropes is set up before and after the mass block is additionally arranged in the middle of the boom, an algorithm of recognizing the equivalent calculation length L0 of the boom by using measured frequencies of the boom before and after the additional mass block is arranged is finally and optimally formed, and therefore the method for accurately measuring the cable force is set up. According to the method for accurately measuring the cable force, measurement is convenient to conduct, and a user only needs to conduct vibration frequency measurement twice on the boom before and after the additional mass block is arranged. The measuring accuracy is high, and the difficult problem of accurately measuring the cable force of the short boom can be well solved. When the method is applied to the field of detection or construction monitoring of boom arch bridges, the cable force of the short boom can be rapidly and conveniently measured at high accuracy, and therefore reliable essential data are provided for detection and monitoring of the boom arch bridges.

Description

technical field

[0001] The invention belongs to the technical field of bridge detection and monitoring, and in particular relates to a method for accurately testing the cable force of a short suspender of a suspender arch bridge. Background technique

[0002] The suspender cable force of the suspender arch bridge is an important index to evaluate the use status of this type of bridge. In the construction monitoring, inspection and evaluation of this type of bridge, it is necessary to test the suspender cable force. At present, the commonly used cable force testing methods mainly include pressure sensor method and frequency method. The pressure sensor method can only test the cable force of the suspender with the pressure sensor pre-installed in the construction, and cannot test the cable force of the suspender without the sensor installed after the bridge is completed. The frequency method is to use the deterministic relationship between the cable force of the boom and the ...

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