發(fā)布時(shí)間：2018-11-14 14:05

【摘要】：地震表面波振幅大,傳播距離遠(yuǎn),頻率較低,一般在20Hz以下,對(duì)結(jié)構(gòu)的危害很大。如何采用新技術(shù)來(lái)有效地降低震害,是科研工作者的迫切任務(wù)。地震表面波周期性波屏障作為一種有效的隔震措施,能夠?qū)μ囟l率范圍內(nèi)的低頻地震動(dòng)進(jìn)行人為設(shè)計(jì)和調(diào)整結(jié)構(gòu)參數(shù),使帶隙頻率覆蓋地震動(dòng)主頻范圍,從而達(dá)到較好的隔震效果。對(duì)地震表面波周期性波屏障設(shè)計(jì)和性能研究具有理論和工程應(yīng)用價(jià)值。本文基于周期結(jié)構(gòu)帶隙設(shè)計(jì)思想,針對(duì)破壞性較強(qiáng)的半空間自由表面Rayleigh波,即地震表面波,尤其是20Hz以下的低頻表面波,設(shè)計(jì)了三種新型表面波屏障,即周期立柱式表面波屏障、雙向周期格柵式表面波屏障和三向周期格柵式表面波屏障,并利用COMSOL MULTIPHYSICS有限元軟件分別對(duì)三種表面波屏障的能帶結(jié)構(gòu)和頻率響應(yīng)以及位移模式進(jìn)行了數(shù)值模擬,給出了全模態(tài)能帶結(jié)構(gòu)中表面波模式的提取方法,分析了帶隙的形成機(jī)理,探討了波屏障結(jié)構(gòu)參數(shù)對(duì)隔震性能的影響。研究結(jié)果表明:1、周期立柱式表面波屏障帶隙形成機(jī)理為局域共振型,立柱的埋入深度、立柱的高度、立柱的半徑能夠有效的調(diào)節(jié)帶隙的寬度。立柱埋入深度的增加和立柱半徑增大都會(huì)使帶隙上下緣位置升高,立柱高度增加會(huì)降低帶隙頻率位置。2、雙向周期格柵式表面波屏障帶隙形成機(jī)理為局域共振型,柵板的幾何參數(shù)能夠有效的調(diào)節(jié)帶隙的寬度,材料參數(shù)對(duì)帶隙頻率范圍影響較大,柵板密度增加、土體密度增加和土體彈性模量減小都會(huì)降低帶隙的頻率位置。3、三向周期格柵式表面波屏障帶隙形成機(jī)理為局域共振型,橫向柵板高度對(duì)帶隙頻率范圍影響較大,橫向柵板位置對(duì)帶隙頻率范圍影響很小。橫向柵板的密度、土體的密度和土體彈性模量對(duì)帶隙頻率范圍影響較大。4、利用聲線和模態(tài)分析相結(jié)合的方法,可以將半埋入式表面波屏障的表面波模式從全模態(tài)能帶結(jié)構(gòu)中分離。5、三種新型表面波屏障帶隙頻率范圍均在20Hz以下,其中,立柱式表面波屏障的帶隙寬度較窄,三向周期表面波屏障表面波帶隙起止頻率比雙向周期表面波屏障表面波帶隙起止頻率低,帶隙寬度比雙向周期表面波屏障表面波帶隙寬度略窄。
[Abstract]:The seismic surface wave has large amplitude, long propagation distance and low frequency. It is generally below 20Hz, which is harmful to the structure. How to adopt new technology to effectively reduce earthquake damage is an urgent task for researchers. As an effective isolation measure, the seismic surface wave periodic wave barrier can artificially design and adjust the structural parameters of low frequency ground motion in the specific frequency range, so that the band gap frequency can cover the main frequency range of ground motion. In order to achieve a better isolation effect. The research on the design and performance of seismic surface wave periodic wave barrier has theoretical and engineering application value. Based on the idea of band gap design of periodic structures, three new types of surface wave barriers are designed for the destructive half-space free surface Rayleigh waves, that is, seismic surface waves, especially the low-frequency surface waves below 20Hz. That is, periodic vertical column type surface wave barrier, bidirectional periodic grid type surface wave barrier and three direction periodic grid type surface wave barrier, The energy band structure, frequency response and displacement mode of three kinds of surface wave barrier are numerically simulated by using COMSOL MULTIPHYSICS finite element software. The extraction method of the surface wave mode in the full-mode energy band structure is given, and the formation mechanism of the band gap is analyzed. The influence of the structural parameters of the wave barrier on the isolation performance is discussed. The results show that: 1. The formation mechanism of the band gap of periodic column type surface wave barrier is local resonance type. The embedded depth of the column, the height of the column and the radius of the column can effectively adjust the width of the band gap. The increase of the depth and radius of the column will increase the position of the upper and lower edge of the band gap, and the height of the column will decrease the frequency of the band gap. 2. The formation mechanism of the band-gap of the bidirectional periodic grid surface wave barrier is local resonance. The geometric parameters of the grid plate can effectively adjust the width of the band gap. The material parameters have a great influence on the frequency range of the band gap. The increase of the density of the grid plate, the increase of the soil density and the decrease of the elastic modulus of the soil will decrease the frequency position of the band gap. The formation mechanism of the band gap of the three direction periodic grid type surface wave barrier is local resonance. The height of the transverse grid has a great influence on the frequency range of the band gap, while the position of the transverse grid has little effect on the frequency range of the band gap. The density of transverse grid, the density of soil and the elastic modulus of soil have great influence on the frequency range of band gap. The surface wave mode of the semi-submerged surface wave barrier can be separated from the full-mode energy band structure. 5. The band gap frequency range of the three new types of surface wave barrier is below 20Hz, among which the band gap width of the column type surface wave barrier is narrow. The starting and stopping frequency of surface wave band gap of three direction periodic surface wave barrier is lower than that of bidirectional periodic surface wave barrier, and the width of band gap is a little narrower than that of bidirectional periodic surface wave barrier.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU352.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 余思遠(yuǎn);張恒;盧明輝;;聲表面波聲子晶體中的能帶結(jié)構(gòu)及帶隙類型[J];南京大學(xué)學(xué)報(bào)(自然科學(xué));2015年06期

2 徐平;;多排樁非連續(xù)屏障對(duì)平面彈性波的隔離[J];巖石力學(xué)與工程學(xué)報(bào);2012年S1期

3 譚燕;何锃;高俊濤;;高速鐵路運(yùn)行引發(fā)的低頻振動(dòng)的隔振分析[J];華南理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年06期

4 時(shí)剛;郭院成;高廣運(yùn);;飽和地基中二維填充溝遠(yuǎn)場(chǎng)被動(dòng)隔振研究[J];巖土工程學(xué)報(bào);2011年01期

5 時(shí)剛;高廣運(yùn);;飽和地基中單排樁遠(yuǎn)場(chǎng)被動(dòng)隔振研究[J];振動(dòng)工程學(xué)報(bào);2010年05期

6 謝偉平;常亮;杜勇;;中南劇場(chǎng)隔振措施分析[J];巖土工程學(xué)報(bào);2007年11期

7 鄧亞虹;夏唐代;陳敬虞;;車輛動(dòng)荷載作用下隔振溝響應(yīng)增強(qiáng)區(qū)數(shù)值分析[J];巖土工程學(xué)報(bào);2006年12期

8 劉晶波;李彬;;Rayleigh波作用下地下結(jié)構(gòu)的動(dòng)力反應(yīng)分析[J];工程力學(xué);2006年10期

9 高廣運(yùn);彭爭(zhēng)光;李偉;馮世進(jìn);;三維層狀地基空溝主動(dòng)隔振分析[J];西北地震學(xué)報(bào);2006年03期

10 李志毅,高廣運(yùn),邱暢,楊先健;多排樁屏障遠(yuǎn)場(chǎng)被動(dòng)隔振分析[J];巖石力學(xué)與工程學(xué)報(bào);2005年21期

相關(guān)會(huì)議論文 前1條

1 徐歡歡;余思遠(yuǎn);盧明輝;;基于鈮酸鋰表面的局域共振型表面波聲子晶體[A];2014’中國(guó)西部聲學(xué)學(xué)術(shù)交流會(huì)論文集[C];2014年

相關(guān)碩士學(xué)位論文 前2條

1 周亞坤;周期結(jié)構(gòu)在屏障隔振中的應(yīng)用[D];北京交通大學(xué);2010年

2 李黎;基于帶隙原理的梁類結(jié)構(gòu)振動(dòng)傳播抑制技術(shù)研究[D];國(guó)防科學(xué)技術(shù)大學(xué);2006年

，

本文編號(hào)：2331372