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Method of monitoring high-strength bolt health of steel truss bridge key component

A technology of key components and state of health, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of complex analysis and calculation of piezoelectric impedance technology, expensive related equipment, and high technical requirements, and achieve high accuracy. , low cost, good durability

Inactive Publication Date: 2017-06-30
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many studies have shown that piezoelectric impedance technology is sensitive to subtle changes such as cracks and looseness, but the analysis and calculation of piezoelectric impedance technology is complicated, the related equipment is expensive, and the technical requirements are high, which limits the further promotion of this method.

Method used

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  • Method of monitoring high-strength bolt health of steel truss bridge key component
  • Method of monitoring high-strength bolt health of steel truss bridge key component
  • Method of monitoring high-strength bolt health of steel truss bridge key component

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Experimental program
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Embodiment Construction

[0021] Utilizing the piezoelectric bidirectional characteristics of piezoelectric ceramics, piezoelectric ceramic drivers and piezoelectric ceramic sensors were fabricated at the same time. By responding to the amplitude change of the signal and analyzing the wavelet packet energy of the signal, the degree of bolt health damage was preliminarily determined. At the same time, a judgment criterion-damage index is defined based on the wavelet packet energy of the response signal, so as to judge the damage of the same order of magnitude for the health damage of the bolt. The invention has the remarkable characteristics of low cost, simple operation, high accuracy, good durability, etc., and can excellently complete the monitoring work of bolt health problems of steel truss bridges.

[0022] The concrete implementation process of the present invention is as follows:

[0023] Step 1. Select a piezoelectric ceramic bare chip with good performance, use copper foil and conductive glue ...

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Abstract

The invention discloses a method of monitoring the high-strength bolt health of a steel truss bridge key component. In the use process of the high-strength bolts, there often exist the damage problems of bolt looseness, bolt rustiness, and bolt shearing failures. The piezoelectric bi-directional characteristics of the piezoelectric ceramic are utilized, and wide frequency bands, fast response piezoelectric ceramic actuators and piezoelectric ceramic sensors are made, through the response to the signal amplitude and energy changes, the health status of the high strength bolt is monitored and evaluated; based on the energy of the response signal, damage indicators of the same order of magnitude are defined, and further analyses and decisions are made on the damage conditions of the bolt. The health monitoring method has the characteristics of being low in cost, simple and quick in operation, and high in accuracy and the like, and is very suitable for the health performance monitoring of high strength bolts for steel truss bridges.

Description

technical field [0001] The invention relates to the technical field of health monitoring of civil engineering structures, in particular to a method for monitoring the health status of high-strength bolts, key components of steel truss bridges. Background technique [0002] Due to the requirement of large span and short construction period, steel truss bridges are used more and more widely; at the same time, in the connection of steel components, high-strength bolts are widely used because of their high strength, simple construction, and convenient replacement. However, during the service process, due to the effects of cyclic fatigue loads, vehicle bumps, vibration shocks, environmental corrosion, etc., the high-strength bolts have different degrees of loosening, corrosion, shearing and other damage during the service period, and the health status of the bolts is often It is difficult to judge directly, or it is easy to be ignored. Once there is a problem with the connection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 蒋田勇李毅宋钢兵张中脊龚奇丰赵腾龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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