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Method for accurately measuring cable force of short boom of boom arch bridge

A test method, short boom technology, applied to force/torque/work measuring instruments, measuring devices, instruments, etc., can solve problems such as short length, boom cable force error, error, etc.

Active Publication Date: 2014-02-05
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the suspension rod arch bridge, the suspension rod located near the arch foot of the bridge is usually very short (often within 200 times the diameter of the suspension rod). Such factors will have a great influence on the frequency of the boom, and the size of this influence is often difficult to determine. Sometimes the error of the cable force of the boom obtained by using the conventional frequency method is very large, and there is a large possibility of misjudgment. even give wrong results

Method used

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  • Method for accurately measuring cable force of short boom of boom arch bridge
  • Method for accurately measuring cable force of short boom of boom arch bridge
  • Method for accurately measuring cable force of short boom of boom arch bridge

Examples

Experimental program
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Embodiment 1

[0044] as attached figure 1, install a vibration pickup on the short suspension rod of the suspension rod arch bridge with length L, connect the vibration pickup to the vibration testing instrument, and measure the first-order vibration angular frequency ω of the suspension rod 1 ; as attached figure 2 , at the middle position L / 2 of the short boom, install an additional mass block (magnetic iron block), the installation method is as attached Figure 5 , use the vibration tester to test the first-order vibration angular frequency ω of the suspender after adding the mass block 1 ′; combined with the boom stiffness EI provided by the design drawings, the boom material density ρ and the boom cross-sectional area A, and the measured mass weight M, the cable force value T of the boom is calculated using formula (8) 0 .

[0045] T 0 = 16 M 4 ...

Embodiment 2

[0050] Adopt the present invention to carry out actual measurement to certain bridge 3# short suspender cable force, as attached figure 1 , install a vibration picker on the short suspender of the suspender arch bridge with a length of L (10.38 meters), connect the vibration picker to a vibration tester, and measure the first-order vibration angular frequency ω of the suspender 1 ; as attached figure 2 , at the middle position L / 2 of the short boom, install an additional mass (magnetic iron block), and use a vibration tester to measure the first-order vibration angular frequency ω of the boom after the additional mass 1 ′; Combined with the design drawings to provide the boom stiffness EI (109757.96N m 2 ), the mass per unit length of the boom ρA (20.88kg / m), and the measured weight of the mass block M (20.75kg), the cable force value T of the boom is calculated using formula (8) 0 . At the same time, the conventional frequency method is used to calculate the cable force v...

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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 suspension rod of a suspension rod arch bridge. Background technique [0002] The suspender cable force of the suspender arch bridge is an important index to evaluate the service 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, frequency method and so on. The pressure sensor method can only test the cable force of the suspenders with pre-installed pressure sensors during construction, and cannot test the cable force of the suspenders without sensors installed after the bridge is completed. The frequency method is to use the deterministic relationship between the cable force of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 王龙林罗月静高建明戴文远彭蓉谢军黎力韬张磊
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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