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Frequency detection method for steel roof truss damage diagnosis

A technology of frequency detection and steel roof truss, which is applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems that cannot meet the needs of damage diagnosis of steel roof truss structures, achieve high accuracy, simple equipment, and low implementation cost low effect

Inactive Publication Date: 2012-09-12
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing technology of engineering practice, only a few low-order frequency parameters can be collected, which cannot meet the needs of damage diagnosis of steel roof truss structures in many cases.

Method used

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  • Frequency detection method for steel roof truss damage diagnosis
  • Frequency detection method for steel roof truss damage diagnosis
  • Frequency detection method for steel roof truss damage diagnosis

Examples

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Embodiment Construction

[0017] The implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] like figure 1 as shown, figure 1 It is a schematic diagram of the additional mass block in the present invention. The additional quality blocks include two identical square iron plates 1 and four identical mounting screws 2. During installation, the two iron plates sandwich the steel roof truss nodes symmetrically and are fixed with four mounting screws. Two iron plates and four mounting screws together form an additional mass. The dynamic data acquisition system includes a wireless sensor and a dynamic data acquisition instrument, and the sensor is fixedly installed in the center of a square iron plate in the additional mass block. Therefore, the data acquisition is more convenient and accurate, and the cost is low, and it does not affect the normal operation of the steel roof truss; its wireless sensor is fixedly installed on...

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Abstract

The invention discloses a frequency detection method for steel roof truss damage diagnosis. The method includes 1 randomly selecting one node in a steel roof truss and installing a detachable mass block on the node; 2 utilizing a dynamic data collection system to measure low order natural frequency of vibration of the steel roof truss with added mass block; 3 disassembling the additional mass block, selecting other nodes of the steel roof truss, installing the additional mass block on the nodes and measuring the low order natural frequency of vibration of the steel roof truss with the added mass block at the new position; and 4 repeating the above processes. The frequency detection method adopts an additional mass method of the additional mass block, is simple in structure, low in cost, capable of conveniently obtaining enough frequency information for damage diagnosis of the steel roof truss structure, simple and convenient to operate and implement and high in diagnosis accuracy.

Description

technical field [0001] The invention belongs to the field of structural damage diagnosis of the civil engineering discipline, and relates to a frequency detection method for steel roof truss damage diagnosis. Background technique [0002] Steel roof truss structures are widely used in many industrial and civil buildings. Due to the increase in service life and the influence of environmental corrosion and disaster loads, steel roof truss collapse accidents have occurred from time to time, and it is urgent to make a timely diagnosis of the damage to facilitate maintenance and reinforcement to avoid catastrophic consequences. [0003] The traditional damage diagnosis methods are mostly visible local experimental methods, such as ultrasonic methods, magnetic field methods, and temperature field methods. These methods generally require the location of the damage to be known in advance and the equipment to be detected can be reached, so the workload is high and the cost is high, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 杨秋伟孙斌祥杨丽君
Owner SHAOXING UNIVERSITY
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