Method for testing tension and rigidity of short derrick boom of arch bridge

A test method, short boom technology, applied in elasticity test, machine/structural component test, measurement of force by measuring frequency change of stressed vibration element, etc. Practical and other issues, to achieve the effect of simple test method, easy implementation and accurate test results

Inactive Publication Date: 2011-07-20
ZHEJIANG UNIV
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Problems solved by technology

However, for very short booms, it is very difficult to obtain accurate high-order natural frequencies in field tests, so the method of using high-order frequencies to test the tension of short booms is not practical

Method used

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  • Method for testing tension and rigidity of short derrick boom of arch bridge
  • Method for testing tension and rigidity of short derrick boom of arch bridge
  • Method for testing tension and rigidity of short derrick boom of arch bridge

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Embodiment Construction

[0017] The present invention utilizes the method of attaching a mass block on the boom to increase the identification conditions of the boom parameters, thereby calculating the tension of the boom according to the fundamental frequency and stiffness; the testing process includes the following steps:

[0018] (1), install a vibration sensor (such as an acceleration sensor) on the boom, test the vibration record under ambient vibration, and obtain the boom frequency f when the boom does not have an additional mass M through spectrum analysis 0 ;The mass weighs about 10kg;

[0019] (2) Install the mass block M on a certain section of the suspender, and record the section position l 1 , and follow step (1) to test the fundamental frequency f of the boom when the added mass of the boom is 1 ;

[0020] (3), move the installation position of mass block, repeat step (2), obtain another group of section position l 2 and boom fundamental frequency f 2 ;

[0021] (4), move the mount...

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Abstract

The invention provides a method for testing tension and rigidity of a short derrick boom of an arch bridge. An aim of calculating the tension of the derrick boom according to a fundamental frequency can be fulfilled by increasing a derrick boom parameter identification condition by a method of arranging a mass block on the derrick boom. According to the characteristic that the fundamental frequency of the short derrick boom is sensitive due to the mass change of the derrick boom, four groups of equations on the relation between the fundamental frequency of the short derrick boom and the additional mass can be obtained according to a test result, and the tension, the bending stiffness and a boundary restraining condition of the derrick boom can be obtained by calculating a characteristic value by using a genetic algorithm in combination with the equation groups. The method for testing the tension and the rigidity of the short derrick boom of the arch bridge is easy to implement on the site; and the test method is simple and the test result is accurate.

Description

technical field [0001] The invention relates to a tension and rigidity testing method of a short suspender of an arch bridge. Background technique [0002] Suspenders are one of the most important stress-bearing components of medium- and under-supported arch bridges. In bridge health monitoring and periodic inspections, the stress state of the bridge structure is usually judged by the tension change test of the suspenders. At present, the commonly used boom tension measurement methods at home and abroad mainly include pressure sensor method, hydraulic jack method, vibration frequency method, magnetic flux method and so on. The vibration frequency method is a test method to calculate the tension based on the measured results of the fundamental frequency of the boom. Its principle is to calculate the tension by using the unique correspondence between the fundamental frequency and the tension in the string vibration theory. This method has the advantages of convenient operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/10G01M5/00
Inventor 谢旭申永刚孙良凤
Owner ZHEJIANG UNIV
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