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Model Test And Modal Analysis Of Self-anchored Suspension Bridge Based On Digital Image Detection Technology

Posted on:2019-05-09Degree:MasterType:Thesis
Country:ChinaCandidate:Z C RenFull Text:PDF
GTID:2382330548973721Subject:Architecture and civil engineering
Abstract/Summary:PDF Full Text Request
In recent years,the structure type of self-anchored suspension bridge has been widely used in urban bridge engineering.The modern suspension bridge evolved from the rope bridge,and it is favored by many bridge engineers because of its numerous advantages,such as large-span,good seismic performance,beautiful appearance and so on.However,as a new type of popular bridge,the later health detection of the suspension bridge has a direct impact on its stability and safety during the period of use.The research on this aspect is relatively lack,and suspension bridge's main cable and the stiffening beam are important parts of the whole structure system.Therefore,a new digital image detection system is proposed for the individual main cable and stiffening beam system based on the research of the whole bridge system,and comparing with the traditional test and finite element modeling to demonstrate the feasibility and reliability of digital image detection technology's using in the main cable and stiffening beam of suspension bridge.The main research content and research results are as follows:(1)Describes the research background,development history,domestic and foreign research status of digital image technology.The principle and realization method of digital image detection technology and the calculation principle of Canny operator which is the most widely used are also introduced in detail.In addition,the experiment of using digital image detecting the simple supported beam is shown to demonstrate the advantages of digital image detection technology in precision and effect through the two experiments of dynamic test and static test.(2)Introduces the principle of two-dimensional orthogonal polynomial fitting and related programs are written to improve the detection accuracy to sub-pixel level.In the process of stiffening beam's detection,the sub-pixel edge is compared with the positive pixel edge.(3)Introduces the great functions of Matlab in digital image detection,sorts out and summarizes the specific operation and processing flow of digital image detection based on Matlab's powerful image processing function.(4)Using Midas/Civil software to simulate the finite element structure of the suspension bridge model,and explains the application of node theorem in the initial balance of suspension bridge in detail.The eigenvalue analysis of the balanced self-anchored suspension bridge is carried out,and obtains the main modes and frequencies of the first 30 orders.(5)In addition to the finite element analysis of the whole bridge system,this article also uses digital image detection for the main cable and stiffened beam of the self-anchored suspension bridge.During the digital image detection of the stiffened beam,the traditional dynamic load testing experiment is also carried out.Compares the two results with the results of the finite element to provide an effective and accurate detection method for the application of digital image detection in the individual components of the self-anchored suspension bridge in the future.The practice has showed that: the detection concept of digital image detection technology in self-anchored suspension bridge is reasonable and effective,which can make up for the shortcomings of traditional detection in suspension bridge detection.It can accurately and effectively analyze the individual dynamic characteristics of the main cable and stiffening girder of self-anchored suspension bridge and providing an effective bridge detection method for the future application of digital image detection technology in self-anchored suspension bridge engineering.
Keywords/Search Tags:Self-anchored suspension bridge, Digital image, Edge detection, Finite element analysis, Modal analysis
PDF Full Text Request
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