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(1 西安理工大學(xué)土木建筑工程學(xué)院， 西安 710048； 

2 西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055)

［摘要］為了研究?jī)A斜磚石古塔的動(dòng)力性能及其隨機(jī)振動(dòng)規(guī)律，依據(jù)虛擬激勵(lì)法及場(chǎng)地振動(dòng)特性，綜合考慮結(jié)構(gòu)及激勵(lì)的隨機(jī)性，對(duì)陜西省旬邑縣泰塔在傾斜矯正施工期間進(jìn)行了隨機(jī)動(dòng)力響應(yīng)分析。計(jì)算了各樓層速度及加速度響應(yīng)的自功率譜，給出了結(jié)構(gòu)振動(dòng)的前2階自振頻率；并進(jìn)行了各樓層響應(yīng)與地面振動(dòng)的互功率譜及頻響函數(shù)分析，研究了樓層隨機(jī)動(dòng)力響應(yīng)與地面隨機(jī)振動(dòng)輸入及結(jié)構(gòu)振動(dòng)的關(guān)系。結(jié)果表明：地面隨機(jī)振動(dòng)加速度對(duì)底部樓層影響較為顯著，而速度響應(yīng)則是在頂部樓層較為明顯，且隨著樓層高度增加，結(jié)構(gòu)自振動(dòng)力響應(yīng)逐漸顯著。因此，進(jìn)行古塔結(jié)構(gòu)振動(dòng)測(cè)試及隨機(jī)振動(dòng)分析應(yīng)依據(jù)研究目的確定測(cè)點(diǎn)位置及所采集信號(hào)類(lèi)型。

［關(guān)鍵詞］磚石古塔； 隨機(jī)振動(dòng)； 動(dòng)力測(cè)試； 振動(dòng)特性

中圖分類(lèi)號(hào)：TU311-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)02-0070-05

Analysis of random vibration test of an inclined ancient masonry pagoda

Cui Xiaoling1, Li Kai2, Lu Junlong1, Chen Ping2, Fan Guanxian2

(1 School of Civil Engineering and Architecture, Xi′an University of Technology, Xi′an 710048, China；

2 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)

Abstract:In order to research the dynamical performance and random vibration laws of inclined masonry pagodas, the random dynamical response analysis on Taita Pagoda in Xunyi County, Shaanxi Province was conducted according to the virtual excitation method and the vibration characteristics of the site during deviation rectification construction. The randomness of the structure and excitation were also considered. The auto-power spectra of velocity and acceleration of each floor were calculated and the vibration frequencies for first and second order stage were given. The cross power spectra and frequency-response function analyses were conducted on response and ground vibration for each floor, the relationship between floor random dynamic response and  ground random vibration input and the relation between floor random dynamic response and structure vibration were studied. Results show that effect of ground random vibration acceleration on the bottom floor is remarkable and the velocity response is evident on top floors. Furthermore, with increase of building height, the dynamic response of the self-vibration of the structure is gradually significant. Therefore, vibration test and random vibration analysis on ancient pagoda structure should be based on the purpose of the study to determine the location of the measuring point and the type of signal acquisition.

Keywords:masonry pagoda; random vibration; dynamical test; dynamical performance

*國(guó)家自然科學(xué)基金項(xiàng)目（51308455），陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃項(xiàng)目（2015JM5206），住房與城鄉(xiāng)建設(shè)部科技計(jì)劃項(xiàng)目（2014-K2-018），陜西省博士后科學(xué)基金資助項(xiàng)目。

作者簡(jiǎn)介：崔曉玲，博士，講師，Email: hongbeibei@xaut.edu.cn。