本文選題：高柔結構　切入點：搖擺地震動　出處：《武漢理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：地震動由三個平動分量和三個轉動分量共同組成的,在以往的研究中,通常會忽略地震動搖擺分量的地震作用。而實際上,地震動搖擺分量對建筑結構的地震效應會帶來顯著的影響。特別是對于高柔結構這類高度較高、側向剛度較低的結構體系,在地震動水平-搖擺耦合作用下時,搖擺地震動不僅會增大高柔結構體系的動力效應,并且由于搖擺轉角位移時程的影響,導致高柔結構產生一定的基礎傾斜,放大了結構的P-?效應。若忽略搖擺地震動,會造成嚴重的后果,因此,對高柔結構在多維地震動作用下的地震效應研究是非常必要的。本文將對高柔結構在地震動水平-搖擺耦合作用下的地震效應進行了試驗和理論研究,探討搖擺地震動,特別是搖擺轉角位移對高柔結構地震效應的影響。主要研究內容如下:1)基于小波分析獲取地震動搖擺分量�；趶娬饡r斷層附近地面地震動搖擺分量對單擺式地震儀水平和豎向擺造成的響應差異性,建立基于小波變換和閾值處理獲取地震動搖擺分量的新方法。采用該方法獲取地震動搖擺分量,并進行振動臺試驗驗證了基于小波分析的地震動搖擺分量獲取方法的正確性和精度;2)非線性動力方程推導。推導地震動水平-搖擺耦合作用下高柔結構的非線性動力方程,并將搖擺轉角位移產生的非對稱P-?效應以一個等效水平側向力的形式加在動力方程的激勵項中;3)高柔結構的振動臺試驗和理論研究。以某電視塔結構為原型,進行了地震動水平、搖擺和水平-搖擺耦合作用下高柔結構的縮尺模型,并與理論分析結果進行對比,探討搖擺轉角位移產生的地震效應影響。通過振動臺試驗和理論分析的結果對比表明:1)基于小波分析獲取的地震動搖擺分量的殘余傾斜位移與實測的基本吻合,且過濾掉搖擺分量的水平分量傅里葉譜的低頻部分與豎向分量的較為相似;振動臺試驗驗證了基于小波分析獲取地震動搖擺分量方法的正確性,且相較于基于傅里葉分析的方法,結果與實際情況更加吻合,精度實現了大幅提高。2)振動臺試驗結果與本文推導的動力方程理論分析結果基本吻合,證實了理論分析的正確性;3)由基礎轉角位移產生的附加P-?效應不僅會增大高柔結構的動力效應,并且會導致高柔結構產生顯著的非對稱位移效應,從而使得結構的水平位移大幅增加,在實際的抗震設計計算中,應予以重視。
[Abstract]:Ground motion is composed of three translational components and three rotational components. In previous studies, the seismic action of the rocking component of ground motion is usually ignored. The seismic effect of building structure will be affected significantly by the rocking component of ground motion, especially for the high height and low lateral stiffness of the high flexible structure, under the coupling action of horizontal and rocking ground motion, especially for the structural system with high height and low lateral stiffness. Rocking ground motion will not only increase the dynamic effect of the high flexible structure system, but also cause the foundation tilting of the high flexible structure due to the influence of the displacement time history of the rocking angle, and amplify the structure's P--? If the shaking ground motion is ignored, there will be serious consequences, therefore, It is very necessary to study the seismic effect of high flexible structure under the action of multi-dimensional ground motion. In this paper, the seismic effect of the flexible structure under horizontal and rocking coupling of ground motion is studied experimentally and theoretically, and the shaking ground motion is discussed. In particular, the effect of rocking angle displacement on seismic effect of tall and flexible structures. The main research contents are as follows: 1) based on wavelet analysis, the rocking component of ground motion is obtained. Based on the rocking component of ground motion near fault during strong earthquake, the swinging component of ground motion near fault is applied to single pendulum ground. The difference of response caused by horizontal and vertical pendulum of seismograph, A new method based on wavelet transform and threshold processing is established to obtain the rocking component of ground motion, and the method is used to obtain the rocking component of ground motion. The vibration table test verifies the correctness and accuracy of the method for obtaining the rocking component of ground motion based on wavelet analysis. The nonlinear dynamic equation of the flexible structure under horizontal and rocking coupling is derived. And the unsymmetrical P-? The effect is added to the excitation term of the dynamic equation in the form of an equivalent horizontal lateral force. The shaking table test and theoretical study of a flexible structure are carried out. The ground motion level is carried out using a television tower as a prototype. The scale model of the flexible structure under the coupling of rocking and horizontal rocking is compared with the theoretical analysis. The effect of rocking angle displacement on seismic effect is discussed. The results of shaking table test and theoretical analysis show that the residual tilt displacement of the rocking component of ground motion obtained by wavelet analysis is in good agreement with the measured one. The low frequency component of the horizontal component of the rocking component is similar to that of the vertical component, and the method of obtaining the rocking component of the ground motion based on wavelet analysis is verified by the shaking table test. Compared with the method based on Fourier analysis, the results are more consistent with the actual situation, and the precision of shaking table test is greatly improved. 2) the results of shaking table test are in good agreement with the theoretical analysis results of the dynamic equation derived in this paper. It is proved that the theoretical analysis is correct. The effect will not only increase the dynamic effect of the tall flexible structure, but also lead to the significant asymmetric displacement effect of the high flexible structure, which makes the horizontal displacement of the structure increase significantly, which should be paid more attention to in the actual seismic design calculation.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU311.3

【參考文獻】

相關期刊論文 前10條

1 周佩佩;巢斯;;關于地震波轉動分量的確定方法的研究[J];建筑結構;2013年S2期

2 公常清;戴靠山;任曉崧;;隨機地震動搖擺分量對風電塔結構地震響應影響的分析[J];土木工程學報;2013年S1期

3 趙伯明;王挺;;高層建筑結構時程分析的地震波輸入[J];沈陽建筑大學學報(自然科學版);2010年06期

4 ;Time-frequency response spectrum of rotational ground motion and its application[J];Earthquake Science;2010年01期

5 楊志勇;黃吉鋒;邵弘;;彈性與彈塑性動力時程分析方法中若干問題探討[J];建筑結構學報;2009年S1期

6 吳琛;周瑞忠;;基于小波變換的結構地震響應與能量計算分析[J];地震工程與工程振動;2006年06期

7 陸鐵堅;李芳;余志武;;在地震動水平與搖擺分量作用下高層結構隨機地震反應[J];中南大學學報(自然科學版);2006年03期

8 劉先明,葉繼紅,李愛群;多點輸入反應譜法的理論研究[J];土木工程學報;2005年03期

9 遲世春,林少書;結構動力模型試驗相似理論及其驗證[J];世界地震工程;2004年04期

10 李宏男,孫鴻敏;小波分析在土木工程領域中的應用[J];世界地震工程;2003年02期

相關碩士學位論文 前2條

1 張勇;水平地震下高橋墩單自由度體系二階效應研究[D];重慶大學;2010年

2 蔡宏紅;小波分析方法模擬地震動的研究[D];西安建筑科技大學;2008年

，

本文編號：1619364