本文關(guān)鍵詞： 基礎(chǔ)隔震 時程分析 輸入地震動 隔震效果　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著社會的發(fā)展，特別是近幾來年，隔震結(jié)構(gòu)在地震中表現(xiàn)出較好的隔震效果，隔震技術(shù)得到越來越多的關(guān)注。經(jīng)過幾十年的發(fā)展，隔震技術(shù)在理論分析、實驗、隔震支座的設(shè)計等都已經(jīng)逐漸成熟。本文包括兩個方面的研究：第一部分是隔震結(jié)構(gòu)動力時程分析輸入地震動選擇的研究，第二部分是不規(guī)則偏心結(jié)構(gòu)采用橡膠鉛芯隔震、摩擦滑移隔震、組合隔震的隔震效果對比分析。分析敘述如下： ①選擇合理的地震波，對結(jié)構(gòu)地震時程分析至關(guān)重要。因此，本文針對目前隔震結(jié)構(gòu)動力時程分析輸入地震動選擇按結(jié)構(gòu)隔震前的T1選取或采用經(jīng)典地震波進行隔震結(jié)構(gòu)輸入地震動研究，提出按結(jié)構(gòu)隔震后的T1選波進行隔震結(jié)構(gòu)時程分析。以大量實際地震動記錄為基礎(chǔ)，采用雙頻段選波法分別按結(jié)構(gòu)隔震前的T1和隔震后的T1選取兩組地震波，并對地震動按70%地震能量持時進行地震持時分類。利用SAP2000建立框架結(jié)構(gòu)模型，輸入所選記錄進行時程分析，考察結(jié)構(gòu)響應(yīng)參數(shù)（底層剪力、樓層頂點位移和最大層間位移）。計算結(jié)果顯示，按結(jié)構(gòu)隔震后T1選波分析，結(jié)構(gòu)響應(yīng)離散性明顯小于按結(jié)構(gòu)隔震前T1選波分析所得地震響應(yīng)的離散性，按隔震后結(jié)構(gòu)T1選波作為隔震結(jié)構(gòu)輸入地震更為合理。長持時地震作用下隔震結(jié)構(gòu)破壞程度大于短持時地震作用，長持時地震動對隔震結(jié)構(gòu)更為不利。因此，建議對于隔震結(jié)構(gòu)除了按T1、Tg選波外，還需考慮地震持時至少選取一條長持時地震波。 ②建立“L”形偏心結(jié)構(gòu)模型，分別采用鉛芯橡膠隔震、摩擦滑移隔震以及組合隔震，，考察結(jié)構(gòu)響應(yīng)參數(shù)（層間剪力、層間位移、層間扭轉(zhuǎn)角），對比三種不同隔震措施的隔震效果，并改變支座型號(等效剛度)或摩擦系數(shù)兩個參數(shù)，分析兩個參數(shù)對隔震結(jié)構(gòu)隔震效果的影響。結(jié)果表明：采用鉛芯橡膠隔震、滑移隔震和組合隔震，可大幅度降低上部結(jié)構(gòu)地震反應(yīng)，結(jié)構(gòu)的扭轉(zhuǎn)變形主要集中在隔震層，上部結(jié)構(gòu)最大層間扭轉(zhuǎn)角值都很小，隔震結(jié)構(gòu)的抗扭性能很好；合理地選擇鉛芯橡膠支座的型號（等效剛度）、滑動支座的摩擦系數(shù)，組合隔震可以具備比鉛芯橡膠隔震和摩擦滑移隔震更好的隔震效果。建議對不規(guī)則偏心結(jié)構(gòu)進行隔震設(shè)計時采用組合隔震。
[Abstract]:With the development of society, especially in recent years, isolation structure has shown better isolation effect in earthquake, and isolation technology has been paid more and more attention. After decades of development, isolation technology has been theoretically analyzed and tested. The design of isolation bearings has been gradually matured. This paper includes two aspects: the first part is the study on the selection of input ground motion in dynamic time-history analysis of isolated structures, and the second part is the use of rubber lead core isolation for irregular eccentric structures. Comparative analysis of the effect of friction sliding isolation and combination isolation. The analysis and description are as follows:. 1 the selection of reasonable seismic wave is very important for structural seismic time history analysis. In this paper, the input ground motion of isolated structures is studied according to T1 before isolation or by classical seismic waves. Based on a large number of actual ground motion records, two sets of seismic waves are selected according to T1 before structure isolation and T1 after isolation, respectively, based on a large number of actual ground motion records. The seismic duration of ground motion is classified according to the energy duration of 70% earthquake. The frame structure model is established by using SAP2000, and the selected records are input for time history analysis, and the structural response parameters (bottom shear force) are investigated. The calculated results show that according to T1 wave selection analysis after structure isolation, the dispersion of structural response is obviously less than that obtained by T1 wave selection analysis before structure isolation. It is more reasonable to select T1 wave of isolated structure as the input of isolated structure. The damage degree of isolated structure under long-lasting earthquake is greater than that of short-lasting earthquake, and long-duration ground motion is more disadvantageous to isolated structure. It is suggested that in addition to selecting waves according to T1Tg, at least one long-lasting seismic wave should be considered for seismic isolation structures. 2 the "L" eccentricity structure model is established, which adopts lead-rubber isolation, friction-slip isolation and combined isolation respectively. The structural response parameters (interstory shear force, interstory displacement, interstory torsion angle) are investigated, and the isolation effects of three different isolation measures are compared. The influence of the two parameters on the isolation effect of the isolated structure is analyzed by changing the two parameters of the bearing type (equivalent stiffness) or friction coefficient. The results show that the lead-rubber isolation, slip isolation and combined isolation are used. The seismic response of the superstructure can be greatly reduced, the torsional deformation of the structure is mainly concentrated in the isolation layer, the maximum interstory torsional angle of the superstructure is very small, and the torsional resistance of the isolated structure is very good. Reasonably select the type of lead rubber bearing (equivalent stiffness, friction coefficient of sliding support, Combination isolation can be better than lead rubber isolation and friction slip isolation. It is suggested that composite isolation should be used in the isolation design of irregular eccentric structures.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU352.12

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