本文關(guān)鍵詞：地鐵運(yùn)行引起的振動(dòng)對(duì)建筑結(jié)構(gòu)的影響及隔振研究　出處：《華南理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地鐵振動(dòng) 1/3倍頻程 振級(jí) 動(dòng)力分析 基底隔振

【摘要】：地鐵以其安全、快捷、方便、舒適、運(yùn)量大等優(yōu)點(diǎn)在全球范圍內(nèi)得到迅猛發(fā)展，，成為城市交通重要的交通工具，它在解決城市交通擁堵，充分利用城市空間，推動(dòng)城市經(jīng)濟(jì)發(fā)展等問題上發(fā)揮了重要作用。然而，地鐵運(yùn)行引起的振動(dòng)問題也日益突出，影響到結(jié)構(gòu)的正常使用和人們的日常生活。 本文結(jié)合位于廣州市地鐵三號(hào)線上的華南理工大學(xué)北區(qū)一教學(xué)樓的隔振問題展開工作。文中首先歸納了環(huán)境振動(dòng)的有關(guān)理論和分析方法，通過對(duì)擬建教學(xué)樓的場(chǎng)地地面振動(dòng)加速度進(jìn)行實(shí)測(cè)，統(tǒng)計(jì)得出地鐵引起的振動(dòng)在場(chǎng)地的傳播與衰減規(guī)律，再將場(chǎng)地中最不利的振動(dòng)加速度激勵(lì)一致輸入到結(jié)構(gòu)基底，采用SAP2000有限元分析軟件研究結(jié)構(gòu)在輸入激勵(lì)下的響應(yīng)，找出影響結(jié)構(gòu)安全和正常使用的潛在因素，最后開展教學(xué)樓的隔振研究。主要研究成果有： （1）總結(jié)振動(dòng)波在土壤中傳播的有關(guān)理論和衰減規(guī)律，簡(jiǎn)要介紹振動(dòng)傳至結(jié)構(gòu)后在梁板構(gòu)件的傳播規(guī)律，并整理了對(duì)結(jié)構(gòu)采取隔振措施的基本理論； （2）實(shí)測(cè)教學(xué)樓場(chǎng)地地面的振動(dòng)加速度時(shí)程，獲取振動(dòng)在場(chǎng)地的傳播規(guī)律，得出以下結(jié)論：地鐵運(yùn)行引起場(chǎng)地地面振動(dòng)的優(yōu)勢(shì)頻率范圍在30~80Hz，其中高頻成分隨距離增大而衰減，低頻成分衰減不明顯；地面z向振動(dòng)大于水平向，研究時(shí)可著重考慮z向；水平向振動(dòng)隨距離增大而衰減，z向則變化不明顯反有反彈。 （3）對(duì)比適用于分析地鐵引起的振動(dòng)的動(dòng)力分析方法，并探討了直接積分法、積分步長(zhǎng)的選取、阻尼矩陣的構(gòu)造和單元的劃分等理論，采用SAP2000有限元分析軟件研究結(jié)構(gòu)在一致輸入激勵(lì)下的振動(dòng)響應(yīng)，得出隨樓層的增加，結(jié)構(gòu)的水平向振動(dòng)先減小后增大，而由于3.15Hz~31.5Hz此頻段的振動(dòng)被放大，結(jié)構(gòu)z向振動(dòng)逐層增大并超出限值；高頻成分沿結(jié)構(gòu)豎向衰減較快，結(jié)構(gòu)本身對(duì)其起到了濾波作用。 （4）結(jié)構(gòu)采取隔振措施后，方案一（三維隔振支座）和方案二（基底橡膠彈簧隔振）均獲得良好的隔振效果，主要是因?yàn)榇笥诟粽耋w系自振頻率的振動(dòng)成分沿結(jié)構(gòu)豎向大幅衰減。但方案二優(yōu)于方案一，其各層的平均振級(jí)在限值以下，滿足規(guī)范要求。
[Abstract]:Subway, with its advantages of safety, speed, convenience, comfort, large capacity and so on, has been developed rapidly in the global scope. It has become an important means of transportation in urban traffic. It solves urban traffic congestion and makes full use of urban space. It plays an important role in promoting the development of urban economy. However, the vibration problem caused by subway operation is increasingly prominent, which affects the normal use of structure and people's daily life. In this paper, the vibration isolation problem of a teaching building in the North District of South China University of Science and Technology, located on Guangzhou Metro Line 3, is studied. Firstly, the theory and analysis method of environmental vibration are summarized. By measuring the ground vibration acceleration of the proposed teaching building, the propagation and attenuation law of the vibration caused by the subway in the site is obtained by statistics. Then the most unfavorable vibration acceleration excitation in the site is uniformly input to the base of the structure, and the response of the structure under the input excitation is studied by using the SAP2000 finite element analysis software. To find out the potential factors that affect the safety and normal use of the structure, and finally to carry out the vibration isolation study of the teaching building. The main research results are as follows: 1) summarizing the theory and attenuation law of vibration wave propagation in soil, briefly introducing the propagating law of vibration to structure in beam-slab member, and arranging the basic theory of vibration isolation measures for structure; 2) the vibration acceleration time history of the ground of teaching building is measured, and the propagation law of vibration in the site is obtained, and the following conclusions are drawn: the dominant frequency range of ground vibration caused by subway operation is 30 ~ 80 Hz. The high frequency component attenuates with the increase of distance, but the low frequency component does not attenuate obviously. The ground vibration in z direction is larger than that in horizontal direction. The horizontal vibration attenuates with the increase of the distance, and the variation of the Z direction is not obvious, but there is no obvious rebound. The comparison is suitable for the dynamic analysis of vibration caused by subway, and the direct integration method, the selection of integral step size, the construction of damping matrix and the division of elements are discussed. The SAP2000 finite element analysis software is used to study the vibration response of the structure under the uniform input excitation. It is concluded that the horizontal vibration of the structure decreases first and then increases with the increase of the floor. Because the vibration of 3.15Hz / 31.5 Hz is amplified, the Z direction vibration of the structure increases layer by layer and exceeds the limit value. The high frequency component decays rapidly along the vertical direction of the structure, which is filtered by the structure itself. After taking vibration isolation measures, both scheme 1 (three dimensional vibration isolation support) and scheme 2 (base rubber spring vibration isolation) have good vibration isolation effect. The main reason is that the vibration component larger than the natural frequency of the isolation system attenuates greatly along the vertical direction of the structure, but the second scheme is superior to the first scheme, and the average vibration level of each layer is below the limit value, which meets the requirements of the code.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.12

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