曲率模态小波法用于网壳结构损伤的识别和定位
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摘要
工程结构损伤的识别与定位研究以往主要针对梁、框架等结构形式,根据大跨度空间结构杆件和节点繁多等特点,提出用曲率模态和小波混合方法对空间结构的损伤进行识别和定位。以跨度100 m的Schwedler网壳结构损伤前、后的曲率模态作为标识量,分别通过离散和连续小波变换,判断网壳结构有无损伤和损伤位置,统计了小波系数差与结构损伤的图形关系,计算了各种损伤工况下该方法判断损伤的准确程度。结果发现基于曲率模态和小波方法的大跨度网壳结构损伤定位精度很高,充分证明该方法对此类结构损伤定位具有有效性和实用性。
The research to identify and locate the damage to the engineering structure mainly aimed at some simple structure forms before,such as beam and framework.In this paper the mixing of the mode curvature and wavelet method to identify and locate the damage to the spatial structure is considered.We take into account the multiplicity of the bars and nodes,and take the destructive and nondestructive mode curvatures of Schwedler reticulated shell with 100 m span as a mark,and calculate the graph relation between coefficients of the wavelets and the damage to the structure by discrete or continuous wavelet transform,and also check the accuracy degree of this method with every damage case.Finally,the conclusion is drawn that the mode curvature and wavelet method to identify and locate the damage to the long span reticulated shell is practical.
The research to identify and locate the damage to the engineering structure mainly aimed at some simple structure forms before,such as beam and framework.In this paper the mixing of the mode curvature and wavelet method to identify and locate the damage to the spatial structure is considered.We take into account the multiplicity of the bars and nodes,and take the destructive and nondestructive mode curvatures of Schwedler reticulated shell with 100 m span as a mark,and calculate the graph relation between coefficients of the wavelets and the damage to the structure by discrete or continuous wavelet transform,and also check the accuracy degree of this method with every damage case.Finally,the conclusion is drawn that the mode curvature and wavelet method to identify and locate the damage to the long span reticulated shell is practical.
引文
[1]丁阳,张玉峰.大跨度空间网格结构杆件损伤程度识别与节点损伤定位研究[D].天津:天津大学,2006.
[2]张德文,魏阜旋.模修正与破损诊断[M].北京:科学出版社,1999:33-56.
[3]李宏男,孙鸿敏.小波分析在土木工程领域中的应用[J].世界地震工程,2003,19(2):17-24.
[4]楼铁锋,俞伟青.小波理论及在结构损伤识别中的应用[J].中国水运,2006,4(6):137-139.
[5]孙增寿,任伟新.基于小波的土木工程结构损伤识别方法研究[D].福州:福州大学,2006.
[6]李洪泉,董亮,吕西林.基于小波变换的结构损伤识别与试验分析[J].土木工程学报,2003,36(5):53-60.
[7]孙增寿,韩建刚,任伟新.基于曲率模态和小波变换的结构损伤位置识别[J].地震工程与工程振动,2005,25(4):44-50.
[8]Wang X L,Liu Y Z.Influence analysis of rise-to-span ratio and sag ratio on the prestressed spatial truss string structure[C]//The eighth in-ternational symposium on structure engineering for young experts.Beijing:Science Press,2004:843-849.
[9]Ronghe G N,Gupta L M,Paramatic.Study of tendon profiles in prestressed steel plate girder[J].Advance in Structural Engineering,2002,5(2):43-52.
[10]Hera A,Hou Z K.Application of wavelet analysis for structural health monitoring[J].ASCE,Journal of Engineering Mechanics,2004,130(1):96-104.
[2]张德文,魏阜旋.模修正与破损诊断[M].北京:科学出版社,1999:33-56.
[3]李宏男,孙鸿敏.小波分析在土木工程领域中的应用[J].世界地震工程,2003,19(2):17-24.
[4]楼铁锋,俞伟青.小波理论及在结构损伤识别中的应用[J].中国水运,2006,4(6):137-139.
[5]孙增寿,任伟新.基于小波的土木工程结构损伤识别方法研究[D].福州:福州大学,2006.
[6]李洪泉,董亮,吕西林.基于小波变换的结构损伤识别与试验分析[J].土木工程学报,2003,36(5):53-60.
[7]孙增寿,韩建刚,任伟新.基于曲率模态和小波变换的结构损伤位置识别[J].地震工程与工程振动,2005,25(4):44-50.
[8]Wang X L,Liu Y Z.Influence analysis of rise-to-span ratio and sag ratio on the prestressed spatial truss string structure[C]//The eighth in-ternational symposium on structure engineering for young experts.Beijing:Science Press,2004:843-849.
[9]Ronghe G N,Gupta L M,Paramatic.Study of tendon profiles in prestressed steel plate girder[J].Advance in Structural Engineering,2002,5(2):43-52.
[10]Hera A,Hou Z K.Application of wavelet analysis for structural health monitoring[J].ASCE,Journal of Engineering Mechanics,2004,130(1):96-104.
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