本文選題：近場(chǎng)地震動(dòng) + 遠(yuǎn)場(chǎng)地震動(dòng)��； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：本文圍繞近場(chǎng)地震下基礎(chǔ)隔震結(jié)構(gòu)反應(yīng)譜展開(kāi)研究,為了得到近場(chǎng)地震下基礎(chǔ)隔震結(jié)構(gòu)的彈塑性反應(yīng)譜,對(duì)結(jié)構(gòu)進(jìn)行基于性能的抗震設(shè)計(jì)。本文通過(guò)建立單自由度彈性反應(yīng)譜的運(yùn)動(dòng)微分方程,對(duì)于彈性體系的運(yùn)動(dòng)微分方程和基本公式進(jìn)行了研究,提出了對(duì)反應(yīng)譜研究應(yīng)當(dāng)集中考慮的問(wèn)題。分析了隔震結(jié)構(gòu)的基本原理,并結(jié)合隔震結(jié)構(gòu)的特點(diǎn)選擇了等效單質(zhì)點(diǎn)計(jì)算模型,根據(jù)鉛芯疊層橡膠支座的特性選擇Bouc-Wen模型作為恢復(fù)力模型,建立了基于Bouc-Wen恢復(fù)力模型的彈塑性動(dòng)力微分方程,同時(shí)對(duì)動(dòng)力反應(yīng)的數(shù)值計(jì)算方法進(jìn)行了分析,并利用Newmark-β法對(duì)動(dòng)力微分方程進(jìn)行了求解。為了得到結(jié)構(gòu)在地震作用下的反應(yīng)譜,本文首先研究了近遠(yuǎn)場(chǎng)地震動(dòng)的基本特征,并分析了其對(duì)結(jié)構(gòu)的影響,根據(jù)近場(chǎng)和遠(yuǎn)場(chǎng)的劃分原則和場(chǎng)地類(lèi)別的劃分原則,對(duì)從美國(guó)地震數(shù)據(jù)庫(kù)(PEER)選取的134條地震波進(jìn)行了分類(lèi),根據(jù)地震動(dòng)特征周期的定義和地震動(dòng)的特點(diǎn),得到各類(lèi)場(chǎng)地的特征周期和地震動(dòng)水平影響系數(shù)最大值。本文對(duì)阻尼比為0.05和0.2情況下的加速度反應(yīng)譜進(jìn)行計(jì)算,通過(guò)對(duì)彈性微分方程的求解,得到近遠(yuǎn)場(chǎng)地震下各類(lèi)場(chǎng)地的相對(duì)加速度反應(yīng)譜,根據(jù)相對(duì)加速度反應(yīng)譜和水平影響系數(shù)的關(guān)系建立了不同場(chǎng)地條件下的水平影響系數(shù)譜,利用最小二乘法對(duì)水平影響系數(shù)譜進(jìn)行擬合,得到了彈性加速度水平影響系數(shù)反應(yīng)譜。研究發(fā)現(xiàn),近場(chǎng)地震下的水平影響系數(shù)最大值相比遠(yuǎn)場(chǎng)較大。在給定強(qiáng)度折減系數(shù)和阻尼比的基礎(chǔ)上,對(duì)基于Bouc-Wen恢復(fù)力模型的彈塑性微分方程進(jìn)行求解,得到近場(chǎng)和遠(yuǎn)場(chǎng)地震下三類(lèi)場(chǎng)地條件下的等強(qiáng)度延性需求譜,對(duì)等強(qiáng)度延性需求譜進(jìn)行擬合,建立R-μ-T三者的關(guān)系,利用R-μ-T關(guān)系并基于彈性加速度水平影響系數(shù)譜建立近場(chǎng)和遠(yuǎn)場(chǎng)地震下三類(lèi)場(chǎng)地條件下的彈塑性位移譜。研究發(fā)現(xiàn),近場(chǎng)地震下彈塑性位移譜譜值比遠(yuǎn)場(chǎng)譜值小,表明對(duì)近場(chǎng)地震下的結(jié)構(gòu)進(jìn)行隔震效果比遠(yuǎn)場(chǎng)較好。對(duì)鉛芯隔震橡膠支座進(jìn)行了壓剪試驗(yàn),并對(duì)鉛芯隔震橡膠支座壓剪試驗(yàn)的結(jié)果進(jìn)行分析,由試驗(yàn)結(jié)果計(jì)算出支座屈服后剛度值和屈服力試驗(yàn)值,對(duì)液化天然氣儲(chǔ)罐進(jìn)行振動(dòng)臺(tái)試驗(yàn),將振動(dòng)臺(tái)試驗(yàn)結(jié)果與彈塑性位移譜結(jié)果進(jìn)行對(duì)比,發(fā)現(xiàn)基于性能的反應(yīng)譜分析較接近結(jié)構(gòu)的實(shí)際反應(yīng),驗(yàn)證了本文所提出反應(yīng)譜的合理性,表明本文的研究成果具有一定的工程應(yīng)用價(jià)值。
[Abstract]:In this paper, the response spectrum of base-isolated structure under near-field earthquake is studied. In order to obtain the elastic-plastic response spectrum of base-isolated structure under near-field earthquake, the performance-based seismic design of the structure is carried out. In this paper, the differential equation of motion and the basic formula of elastic system are studied by establishing the differential equation of motion of single degree of freedom elastic response spectrum, and the problems that should be considered in the study of response spectrum are put forward. The basic principle of the isolated structure is analyzed, and the equivalent single mass point calculation model is selected according to the characteristics of the isolated structure, and Bouc-Wen model is chosen as the restoring force model according to the characteristics of the lead-core laminated rubber bearing. The elastoplastic dynamic differential equation based on Bouc-Wen restoring force model is established, and the numerical calculation method of dynamic response is analyzed, and the dynamic differential equation is solved by Newmark- 尾 method. In order to obtain the response spectrum of structures under earthquake action, the basic characteristics of near-far-field ground motions are studied in this paper, and their effects on structures are analyzed, according to the classification principles of near-field and far-field and the classification of sites. 134 seismic waves selected from American seismic database (per) were classified. According to the definition of characteristic period of ground motion and the characteristics of ground motion, the maximum value of characteristic period and horizontal influence coefficient of ground motion were obtained. In this paper, the acceleration response spectra with damping ratios of 0.05 and 0.2 are calculated. By solving the elastic differential equations, the relative acceleration response spectra of various sites under near-far-field earthquakes are obtained. According to the relation between the relative acceleration response spectrum and the horizontal influence coefficient, the horizontal influence coefficient spectrum under different site conditions was established. The horizontal influence coefficient spectrum was fitted by the least square method, and the response spectrum of the elastic acceleration horizontal influence coefficient was obtained. It is found that the maximum value of horizontal influence coefficient in near field earthquake is larger than that in far field. On the basis of given strength reduction coefficient and damping ratio, the elastoplastic differential equation based on Bouc-Wen restoring force model is solved, and the equivalent strength ductility demand spectrum under three kinds of site conditions under near-field and far-field earthquakes is obtained. The R- 渭 -T relation is established by fitting the demand spectrum of ductility of equal strength, and the elastic-plastic displacement spectrum under three kinds of site conditions under near-field and far-field earthquakes is established by using R- 渭 -T relation and based on the spectrum of the influence coefficient of elastic acceleration level. It is found that the spectrum of elastic-plastic displacement is smaller than that of the far-field in near-field earthquake, which indicates that the isolation effect of the structure under near-field earthquake is better than that in the far-field. The compression shear test of lead isolated rubber bearing was carried out, and the results of compression shear test of lead isolated rubber bearing were analyzed. The stiffness value and yield force test value after bearing yield were calculated from the test results. The vibration table test of liquefied natural gas storage tank is carried out. The results of shaking table test are compared with the results of elastic-plastic displacement spectrum. It is found that the performance-based response spectrum analysis is closer to the actual response of the structure, which verifies the rationality of the response spectrum proposed in this paper. It shows that the research results of this paper have certain engineering application value.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU435;TU352.12

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