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 (河北科技大學(xué)建筑工程學(xué)院, 石家莊 050018)

［摘要］網(wǎng)架是以桿單元作為主要構(gòu)件的結(jié)構(gòu)，節(jié)點(diǎn)損傷信息無(wú)法反映損傷桿單元的真實(shí)位置。采用單元損傷信息作為桿單元損傷位置判定的參數(shù)，結(jié)合桿單元損傷前后的應(yīng)變模態(tài)差，建立了桿單元應(yīng)變模態(tài)損傷識(shí)別方法。損傷表現(xiàn)為信號(hào)局部特征的改變，而小波分析在時(shí)域和頻域上都具有表征信號(hào)局部特征的能力，故將桿單元損傷前后應(yīng)變模態(tài)差作為結(jié)構(gòu)損傷指標(biāo)，應(yīng)用小波變換對(duì)網(wǎng)架損傷桿單元進(jìn)行定位。將該方法應(yīng)用于一個(gè)正放四角錐網(wǎng)架結(jié)構(gòu)的桿單元損傷識(shí)別，結(jié)果表明，該方法在低階模態(tài)下就能較準(zhǔn)確地定位網(wǎng)架結(jié)構(gòu)中單一或多個(gè)損傷的位置。

［關(guān)鍵詞］小波分析；桿單元；單元應(yīng)變模態(tài)差；小波變換；損傷位置

Detection of link element damage in grid structure based on wavelet analysis

Zhang Yue, Zhang Limei, Du Shoujun, Liu Weiran

(Civil Engineering and Architecture of Hebei University of Science and Technology, Shijiazhuang 050018, China)

Abstract:Link elements are the main components of grid structure, while the damage information of nodes cannot reflect the real link element damage location. The damage information of link elements were adopted, and the difference of element strain modes of link element was considered as the damage parameter. Damage shows changes of local characteristics of the signal, while wavelet analysis can reflect local damage traits of the signal in time domain and frequency domain. Therefore, the damage location of link element can be located by the difference of element strain mode with wavelet transformation. A grid structure damage detection was analyzed by this method，and the results show that this method can be used to determine location of the single and more damages in the grid structure.

Keywords:wavelet analysis; link element; difference of element strain mode; wavelet transformation; damage location

河北省建設(shè)廳資助項(xiàng)目(2008-139),河北科技大學(xué)大學(xué)生創(chuàng)新基金資助項(xiàng)目(2009-142)。

作者簡(jiǎn)介：張悅，碩士研究生，yinyue0823@163.com。

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