Method for measuring rope force of multi-span steel stay rope by using multi-frequency method

A multi-frequency, cable force technology, applied in the measurement of the frequency change force of the stressed vibrating element, special data processing applications, instruments, etc., can solve the problem of not being able to detect the cable force with a brace

Inactive Publication Date: 2010-06-30
BEIJING ACAD OF BUILDING ENG
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Problems solved by technology

[0007] The purpose of this invention is to provide a method for measuring the cable force of multi-span steel cables by using the multi-frequency method, and to solve the technical problem that the traditional dynamic measurement method cannot be used for the detection of cable force with braces

Method used

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  • Method for measuring rope force of multi-span steel stay rope by using multi-frequency method
  • Method for measuring rope force of multi-span steel stay rope by using multi-frequency method
  • Method for measuring rope force of multi-span steel stay rope by using multi-frequency method

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Embodiment Construction

[0043] figure 1 In order to take the multi-span cable divided by the brace as the vibration analysis unit, the vibration constitutive model of the cable unit is established, and its expression is

[0044]

[0045] in: is the amplitude of the rotation angle at end A of the cable; is the amplitude of the rotation angle at end B of the cable; Δ 3 =Y A is the vertical displacement amplitude of end A of the cable; Δ 4 =Y E is the vertical displacement amplitude of cable B end; P 1 = M A is the bending moment amplitude at end A; P 2 = M B is the bending moment amplitude at end B; P 3 =Q A is the shear force amplitude at end A; P 4 =Q B Amplitude of shear force at end B.

[0046] The element stiffness coefficients are:

[0047] K 11 = K 22 = iD; K 21 = K 12 =iE

[0048] K 13 = - K 24 = i l F ; K ...

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Abstract

The invention relates to a method for measuring a multi-span steel stay rope by using a multi-frequency method. The implementation process thereof comprises the following steps: acquiring a time-domain vibration signal, obtaining self vibration frequency passing through n plus 1 order by fast Fourier transform and frequency spectrum analysis, then establishing a frequency characteristic equation with a jack stay rope structural vibration model, establishing a least square method optimization objective function according to the frequency characteristic equation, taking the obtained self vibration frequency of n plus 1 order into the objective function, and obtaining the rope force and the restriction rigidity of the jack stay. The method solves the problem that the traditional dynamic measurement method can be not used for detecting the rope force of the rope with the jack stay, and has simple and convenient technical implementation process, high measurement accuracy of rope force and the like. The method can be widely applied in measurement of rope force of the stay rope with the jack stay in the construction period of a prestress steel structure and measurement of rope force of various restriction ropes in the process of safety maintenance of the engineering.

Description

technical field [0001] The invention relates to a method for detecting the cable force of a steel cable. Background technique [0002] The dynamic measurement method (frequency method) is a commonly used method for single-cable force detection. This method is based on the relationship between the natural vibration frequency and the cable force established by the string vibration theory, and the cable force is calculated by measuring the vibration frequency of the cable. The formula is as follows [0003] [0004] Where: T is the force of the cable; m is the linear density of the cable; f n is the nth order frequency of the cable; l is the length of the cable; ET is the bending modulus of the cable. [0005] The on-site technology implementation process is to arrange precision sensors on the cables to collect the vibration signals (time domain signals) of the cables under environmental excitation or artificial excitation, filter and amplify the signals, and then analyze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/10G06F19/00
Inventor 秦杰王克仁高政国张宇鹏沈斌钱英欣徐瑞龙王泽强陈新礼袁英战徐中文王军司波尤德清吕李清杜彦凯苏浩
Owner BEIJING ACAD OF BUILDING ENG
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