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Study on Damage Identification of Structures Based on the Wavelet Packet Energy

Author: Cui
Tutor: HanXi
School: Chongqing Jiaotong University
Course: Engineering Mechanics
Keywords: Wavelet Packet Energy Damage Identification Moving Load Impact load
CLC: U441.4
Type: Master's thesis
Year: 2010
Downloads: 110
Quote: 0
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Abstract


The bridge is an important part of the transportation system , and the good condition of the bridge structure is the premise of the normal operation of the transportation system . With the growth of the useful life of bridge structures , corrosion of the natural environment as well as the role of the various loads , there are a lot of bridges to the phenomenon of aging, damage , cracks occurred . If the bridge structure in the event of the destruction of the national economy , social stability and people 's lives and property have a significant direct impact damage identification of bridge structure , there are important theoretical significance and practical value . Bridge Structural Damage Identification static load test method to determine the relative to the static test , the structural damage identification method based on the power measurement is the research hotspot . Dynamic test method using transient impact loads or moving loads are two common loading scheme . Article uses the finite element software to model transient shock loads and moving loads beam acceleration response were calculated , and the wavelet packet energy analysis of the rate of change of the two loads wavelet energy and its confidence limit , and by the rate of change parameter to identify the location of the model beam damage . On the basis of theoretical analysis in the laboratory pouring 5.3m reinforced concrete simply supported T - beam damage stage loading . Homemade the constant shock device to simulate transient impact loads , use a known weight of the iron ball to simulate moving loads and acceleration signal pickup injury state . Use dbN series wavelet noise reduction, signal acquisition to calculate the acceleration signal after noise reduction and obtain the wavelet packet energy rate index can accurately determine the reinforced concrete structure damage location and relative damage state .

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Bridge strength and fatigue damage
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