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Method for measuring fundamental frequency and cable force of cable-stayed bridge cable

A technology of fundamental frequency and cable-stayed bridge cables, which is applied in the field of bridge structures to achieve the effects of reducing difficulty, improving recognition accuracy, and strong operability

Inactive Publication Date: 2016-07-20
XIANGTAN UNIV
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  • Application Information

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Problems solved by technology

Therefore, there is a large error in the fundamental frequency value of the cable determined by the frequency difference method

Method used

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  • Method for measuring fundamental frequency and cable force of cable-stayed bridge cable
  • Method for measuring fundamental frequency and cable force of cable-stayed bridge cable
  • Method for measuring fundamental frequency and cable force of cable-stayed bridge cable

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Embodiment Construction

[0024] The technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] The measuring method of cable fundamental wave frequency and cable force of the present embodiment cable-stayed bridge comprises the following steps:

[0026] The first step is to perform self-power spectrum analysis on the measured cable vibration signal, and read the frequency value f corresponding to each peak in the spectrum diagram i , f j ,..., f n , arranged in ascending order of frequency values, and make difference between adjacent peaks to get Δf 1 , Δf 2 ,…Δf n ; Then, cal...

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Abstract

The invention discloses a method for measuring fundamental frequency and cable force of a cable-stayed bridge cable. The method is technologically characterized in that self power spectrum analysis is performed on an actually measured cable vibration signal, thereby reading a frequency value which corresponds with each peak value in a frequency spectrum diaphragm, and obtaining an appropriate functional frequency value fc1 of the cable-stayed bridge cable through a frequency difference method; reading the frequency value which corresponds with the maximal peak value in the frequency spectrum diaphragm, calculating an order number which corresponds with the maximal peak value, and acquiring an approximate fundamental frequency value fc2 again; based on a Zoom-FFT algorithm, performing frequency spectrum fining analysis on a selected frequency band range, defining the frequency value which corresponds with the maximal peak value of the frequency band, namely the fundamental frequency f0; and substituting the fundamental frequency value f0 into a string vibration formula, thereby defining the cable force of the cable-stayed bridge cable. The method of the invention has advantages of improving identification precision on the fundamental frequency of the cable-stayed bridge cable, greatly reducing technical difficulty in accurately identifying the frequency value of the cable-stayed bridge cable and reducing time in data analysis. The method of the invention does not require a complicated judgment and processing process and has high operability.

Description

technical field [0001] The invention belongs to the field of bridge structures, and relates to a method for determining the fundamental wave frequency of a cable-stayed bridge when detecting the cable force of a cable-stayed bridge by a vibration frequency method, in particular to a method for measuring the fundamental wave frequency and the cable force of a cable-stayed bridge. Background technique [0002] Cables are important load-bearing components of cable-stayed bridges, and the magnitude of the cable forces controls the internal force distribution and bridge shape changes of cable-stayed bridges. The measurement of the cable force of the cable-stayed bridge is very important for the cable-stayed bridge in the construction period and in the completed state. [0003] Due to the limitations of on-site measurement conditions and the arrangement of measuring points, when the vibration frequency method is used to measure the cable force of a cable-stayed bridge, it is gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/10
CPCG01L1/10
Inventor 龙士国梁宝李婷李印
Owner XIANGTAN UNIV
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