發(fā)布時(shí)間：2018-02-14 01:11

  本文關(guān)鍵詞： 近斷層地震動(dòng) 速度脈沖識(shí)別 經(jīng)驗(yàn)?zāi)B(tài)分解 基礎(chǔ)隔震結(jié)構(gòu)　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隔震結(jié)構(gòu)在普通遠(yuǎn)場(chǎng)地震作用下抵御效果良好,但近斷層地震動(dòng)具有不同于普通地震動(dòng)的特性,導(dǎo)致破壞性更大,尤其是對(duì)長(zhǎng)周期或減隔震結(jié)構(gòu)。其主要原因是速度脈沖的影響。以往隔震結(jié)構(gòu)的設(shè)計(jì)通常是基于普通遠(yuǎn)場(chǎng)地震動(dòng)進(jìn)行的,隨著隔震結(jié)構(gòu)的規(guī)模化推廣,需要深入研究速度脈沖型地震動(dòng)對(duì)基礎(chǔ)隔震結(jié)構(gòu)的影響,完善近斷層區(qū)域隔震結(jié)構(gòu)設(shè)計(jì)理論。本文針對(duì)兩個(gè)問(wèn)題進(jìn)行研究,一是如何量化識(shí)別含速度脈沖的地震動(dòng),二是研究其對(duì)基礎(chǔ)隔震結(jié)構(gòu)反應(yīng)的影響。本文針對(duì)上述兩個(gè)問(wèn)題展開(kāi)研究,主要內(nèi)容和結(jié)論如下:1.簡(jiǎn)要介紹了三種類型的速度脈沖型地震動(dòng)識(shí)別方法。包括Baker(2007)基于小波分析的脈沖型地震動(dòng)的識(shí)別方法,Zhai(2013)基于能量的脈沖型地震動(dòng)識(shí)別方法。由于這兩種方法沒(méi)有充分考慮脈沖形狀的多樣性,且主觀預(yù)設(shè)參數(shù)較多。因此本文地震動(dòng)的識(shí)別使用以本征模態(tài)函數(shù)(IMF)重構(gòu)為基礎(chǔ),基于經(jīng)驗(yàn)?zāi)B(tài)分解(EMD)的速度脈沖型地震動(dòng)的識(shí)別方法。2.利用SAP2000軟件建立5層、10層和15層RC基礎(chǔ)隔震模型,分別通過(guò)統(tǒng)一能量,PGA、PGV控制下的30條地震波,分析速度脈沖對(duì)基礎(chǔ)隔震結(jié)構(gòu)反應(yīng)的影響。研究表明,速度脈沖使得基礎(chǔ)隔震結(jié)構(gòu)的位移和基底剪力反應(yīng)明顯增大。速度、加速度以及層間位移角等無(wú)明顯規(guī)律。本文的研究結(jié)果,揭示近斷層速度脈沖對(duì)基礎(chǔ)隔震結(jié)構(gòu)的不利影響,為近斷層區(qū)域基礎(chǔ)隔震結(jié)構(gòu)的抗震設(shè)防提供有參考價(jià)值的建議。
[Abstract]:The isolated structure has good resistance effect under the action of ordinary far-field earthquake, but the near-fault ground motion has the characteristics different from the ordinary ground motion, resulting in more destructive. The main reason is the influence of velocity pulse. The design of isolation structure is usually based on ordinary far-field ground motion, with the spread of isolation structure on a large scale. It is necessary to deeply study the effect of velocity pulse ground motion on the foundation isolated structure, and perfect the design theory of isolation structure in near-fault region. This paper focuses on two problems, one is how to identify the ground motion with velocity pulse quantitatively, and the other is how to identify the ground motion with velocity pulse. The second is to study its effect on the response of base-isolated structure. The main contents and conclusions are as follows: 1. Three types of velocity pulsed ground motion identification methods are briefly introduced, including Bakerian 2007) Pulse ground motion identification method based on wavelet analysis Zhaiwei 2013) energy based pulsed ground motion identification method. Since the two methods do not fully take into account the diversity of pulse shapes, Therefore, the identification of ground motion in this paper is based on the intrinsic mode function (IMF) reconstruction. The identification method of velocity pulse type ground motion based on empirical mode decomposition (EMD). 2. Using SAP2000 software, the isolation model of 10 and 15 layers RC foundation is established, and 30 seismic waves under the control of PGV under the control of unified energy are used, respectively. The effect of velocity pulse on the response of base-isolated structure is analyzed. The results show that the displacement and the base shear response of the base-isolated structure are obviously increased by the velocity pulse. There are no obvious laws such as acceleration and interstory displacement angle. The research results of this paper reveal the adverse effects of near-fault velocity pulse on base-isolated structures and provide valuable suggestions for seismic fortification of base-isolated structures in near-fault regions.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU352.12;TU435

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