A Fatigue Crack Monitoring Device and Method for Steel Bridge Deck Based on Guided Wave Sensing
A technology for steel bridge decks and fatigue cracks, which is used in measuring devices, using sonic/ultrasonic/infrasonic waves to analyze solids, and using sonic/ultrasonic/infrasonic waves for material analysis, etc. Intelligent monitoring, incomplete detection and other problems, to achieve the effect of reducing the number of sensors and on-site detection operations, realizing real-time intelligent monitoring, and ensuring safe use performance
Active Publication Date: 2021-09-24
SHANGHAI JIAOTONG UNIV
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[0003] Among the fatigue crack monitoring and detection methods of steel bridge decks, the most widely used and the simplest and most direct is the manual visual inspection method, but this method has certain limitations. For example, it is difficult for inspectors to detect all fatigue cracks in steel bridge decks, and it is difficult Inability to reach certain fatigue cracking sensitive areas
In addition, some steel structure fatigue crack detection equipment such as radiographic testing, magnetic particle testing, and liquid penetrant testing can accurately measure the crack size, but these equipment also require manual on-site operation, and there may also be problems of incomplete detection and inaccessibility of some areas , and it is impossible to realize intelligent monitoring through remote control
[0004] After searching, the Chinese invention patent with the announcement number CN110596243A proposed a fatigue detection system for orthotropic steel bridge deck roof based on ultrasonic guided waves. purpose, but unable to achieve real-time intelligent monitoring of fatigue cracks
After searching, the Chinese invention patent with the announcement number CN104007117A proposes an automatic detection device and method for fatigue cracks in orthotropic steel bridge decks, and arranges the optical fiber breakage line in the fatigue crack sensitive area to achieve the purpose of crack position and length monitoring. A large number of sensors need to be arranged during monitoring, and the coverage is limited, which is not conducive to practical engineering applications
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[0038] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0039] refer to figure 1As shown, it is a schematic diagram of the overall layout of the fatigue crack monitoring device for steel bridge decks based on guided wave sensing in a preferred embodiment of the present invention. The steel bridge decks are included in the figure, and longitudinal ribs 8 are arranged along the length direction of the bottom surface of the steel bridge decks. A plurality of diaphragms 9 are arranged at intervals along the length of the longitudinal ribs 8, and the tops o...
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The invention provides a steel bridge deck fatigue crack monitoring device and method based on guided wave sensing. The device includes: a data transmission module, which receives monitoring instructions sent by a computer terminal and sends guided wave signals; The piezoelectric guided wave exciter receives the monitoring instructions sent by the data transmission module, and converts the monitoring instructions into guided wave signals that propagate longitudinally along the steel bridge deck to be tested in one direction and / or two directions, and the guided wave signals are collected in real time. The fatigue crack characteristics of the bridge deck; the piezoelectric guided wave receiver connected to the input end of the data transmission module receives the guided wave signal excited by the piezoelectric guided wave exciter and has crack characteristics, and converts the received guided wave signal into The crack information is transmitted to the computer terminal through the data transmission module. The invention utilizes the longitudinal propagation of the guided wave signal to realize real-time collection of fatigue crack features of the steel bridge deck, realizes real-time intelligent monitoring of the fatigue cracks of the steel bridge deck, and is simple in manufacture, convenient in use and high in precision.
Description
technical field [0001] The invention relates to the technical field of steel structure fatigue crack monitoring, in particular to a device and method for monitoring fatigue cracks of steel bridge decks based on guided wave sensing. Background technique [0002] Steel bridge decks have the advantages of light structural weight, high overall efficiency, strong spanning capacity, and good seismic performance, and are widely used in large and medium-span bridge projects at home and abroad. However, due to the complex structural stress, difficult control of welding defects, and direct bearing of vehicle dynamics, the fatigue cracking of steel bridge decks is also very prominent. There have been a large number of reports on fatigue cracking of steel bridge decks in Britain, Germany, Japan, and the United States, and a large number of fatigue cracks have been detected in steel bridge decks of Humen Bridge, Jiangyin Bridge, and Xihoumen Bridge in my country. These cracks usually ap...
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IPC IPC(8): G01N29/04
CPCG01N29/045G01N2291/0289
Inventor 程斌石林泽向升李得睿
Owner SHANGHAI JIAOTONG UNIV