基于曲率模态差和小波变换的网架损伤识别

TU393.3%TU317.1; 采用一种基于曲率模态差和小波变换的损伤位置识别方法,对网架结构中常见的正放四角锥网架、两向正交正放网架、两向正交斜放网架、三向网架和蜂窝型三角锥网架进行了损伤识别,以结构损伤前后的曲率模态差作为小波变换的分析信号,对其进行db3连续和离散小波变换,确定杆件损伤位置.数值分析结果表明,在仅测得一阶模态的情况下,应用曲率模态差和小波变换相结合的方法可以对网架的单个损伤位置和多个损伤位置进行有效识别....

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Bibliographic Details
Published in河北科技大学学报 Vol. 35; no. 4; pp. 384 - 391
Main Author 范梦 张丽梅
Format Journal Article
LanguageChinese
Published 河北科技大学建筑工程学院,河北石家庄,050018 2014
Subjects
小波变换系数
损伤识别
曲率模态差
网架结构
网架结构
wavelet transform coefficients
曲率模态差
grid structure
小波变换系数
损伤识别
damage identification
curvature mode difference
Online AccessGet full text
ISSN1008-1542
DOI10.7535/hbkd.2014yx04013

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Summary:TU393.3%TU317.1; 采用一种基于曲率模态差和小波变换的损伤位置识别方法,对网架结构中常见的正放四角锥网架、两向正交正放网架、两向正交斜放网架、三向网架和蜂窝型三角锥网架进行了损伤识别,以结构损伤前后的曲率模态差作为小波变换的分析信号,对其进行db3连续和离散小波变换,确定杆件损伤位置.数值分析结果表明,在仅测得一阶模态的情况下,应用曲率模态差和小波变换相结合的方法可以对网架的单个损伤位置和多个损伤位置进行有效识别.
Bibliography:FAN Meng, ZHANG Limei （School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang Hebei 050018, China）
A damage detection method based on curvature mode difference and wavelet transformation is used to determine the damage location of common gird structures including square pyramid space grid structure,orthogonal space truss structure,two way diagonal lattice grids structure,three way latticed grid and honeycomb triangular pyramid grid structure.The curvature mode difference of pre-and post-damage is taken as the wavelet transform analysis signal,and it is analyzed by discrete wavelet transform using wavelet function db3,then the damage location of links will be obtained.Numerical analysis shows that this method can effectively identify single damage location and multi damage location of grid structures after obtaining only the first mode condition.
curvature mode difference; wavelet transform coefficients; grid structure; damage identification
13-1225/TS
ISSN:1008-1542
DOI:10.7535/hbkd.2014yx04013