本文選題：預(yù)應(yīng)力大跨度 + 地鐵車(chē)站��； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：大跨地鐵車(chē)站結(jié)構(gòu)采用先進(jìn)的預(yù)應(yīng)力技術(shù)實(shí)現(xiàn)大空間,充分利用結(jié)構(gòu)美體現(xiàn)現(xiàn)代交通建筑的特點(diǎn),為乘客提供舒適的乘車(chē)環(huán)境,實(shí)現(xiàn)地鐵車(chē)站安全性、可靠性、適用性、經(jīng)濟(jì)性和技術(shù)先進(jìn)性有機(jī)統(tǒng)一,與傳統(tǒng)的雙層三跨柱島式地鐵站相比具有更大優(yōu)勢(shì)。然而,地鐵是人流量集中區(qū)域,地鐵結(jié)構(gòu)一旦破壞會(huì)造成巨大的經(jīng)濟(jì)損失,并且地下結(jié)構(gòu)的修復(fù)存在諸多困難。因此,對(duì)預(yù)應(yīng)力無(wú)中柱大跨度地鐵站進(jìn)行地震破壞機(jī)理和抗震性能的研究具有重要的理論意義與工程應(yīng)用價(jià)值。本文以預(yù)應(yīng)力大跨度無(wú)中柱地鐵車(chē)站結(jié)構(gòu)為研究背景,考慮車(chē)站結(jié)構(gòu)的預(yù)應(yīng)力效應(yīng),土-結(jié)構(gòu)的初始應(yīng)力以及阻尼,基于大型商業(yè)有限元軟件ABAQUS,用截面等效剛度法將密肋框架結(jié)構(gòu)簡(jiǎn)化為二維平面應(yīng)變框架結(jié)構(gòu),采用粘彈性人工邊界,分別在水平和豎向地震作用下進(jìn)行震害數(shù)值模擬,研究了預(yù)應(yīng)力無(wú)中柱大跨度地鐵站結(jié)構(gòu)的地震反應(yīng)特性,得出了預(yù)應(yīng)力無(wú)中柱大跨度地鐵車(chē)站在地震時(shí)的破壞模式和薄弱位置分布特點(diǎn)。主要研究?jī)?nèi)容如下：1.介紹了用于進(jìn)行土-結(jié)構(gòu)動(dòng)力相互作用分析的土體本構(gòu)、混凝土動(dòng)塑性損傷本構(gòu)模型及其原理；土-結(jié)構(gòu)接觸面的數(shù)值模型處理方法。2.比較了固定邊界、粘性邊界、無(wú)限元邊界、粘彈性邊界等邊界條件動(dòng)力特性；分析不同波動(dòng)輸入方式下自由場(chǎng)地的動(dòng)力特性。在有限元軟件ABAQUS中實(shí)現(xiàn)了靜-動(dòng)力人工邊界條件的轉(zhuǎn)換方法,并驗(yàn)證了靜-動(dòng)力人工邊界條件轉(zhuǎn)換方法的可靠性。3采用動(dòng)塑性混凝土損傷本構(gòu)模型,用拉壓損傷因子描述混凝土在循環(huán)荷載下的非線(xiàn)性與疲勞性能,綜合考慮了震前土-結(jié)構(gòu)自重應(yīng)力、鋼筋混凝土預(yù)應(yīng)力和地鐵車(chē)站結(jié)構(gòu)的阻尼效應(yīng),對(duì)土-地鐵結(jié)構(gòu)相互作用系統(tǒng)地進(jìn)行了地震過(guò)程的非線(xiàn)性數(shù)值模擬。分析了震害發(fā)生時(shí)大跨度預(yù)應(yīng)力地鐵車(chē)站結(jié)構(gòu)動(dòng)應(yīng)力反應(yīng)集中,得出了該類(lèi)車(chē)站結(jié)構(gòu)的破壞過(guò)程、破壞形式和抗震薄弱位置,并給出了合理的解釋。4將兩待選大跨地鐵站結(jié)構(gòu)與雙層三跨柱島式地鐵站結(jié)構(gòu)進(jìn)行對(duì)比,保證靜力作用下安全可靠同時(shí)進(jìn)行了地震響應(yīng)分析,比較了不同位置加速度響應(yīng)、裂縫的產(chǎn)生發(fā)展、應(yīng)力響應(yīng)等因素。綜合評(píng)價(jià)了兩個(gè)預(yù)應(yīng)力大跨度地鐵站的抗震性能,建議了優(yōu)選結(jié)構(gòu)。
[Abstract]:The large span subway station structure adopts advanced prestress technology to realize large space, fully utilize the structure beauty to embody the characteristics of modern traffic building, provide comfortable riding environment for passengers, and realize the safety, reliability and applicability of subway station. Compared with the traditional double-layer three-span island subway station, the economy and technology are organic unity. However, subway is a concentrated area of human flow. Once the subway structure is destroyed, it will cause huge economic losses, and there are many difficulties in the repair of underground structure. Therefore, it is of great theoretical significance and engineering application value to study the seismic failure mechanism and seismic performance of prestressed large-span metro stations without medium columns. In this paper, the prestressing effect of the station structure, the initial stress of soil-structure and damping are considered. Based on the commercial finite element software Abaqus, the cross section equivalent stiffness method is used to simplify the multi-ribbed frame structure to two-dimensional plane strain frame structure, and the viscoelastic artificial boundary is used to simulate the earthquake damage under horizontal and vertical earthquake respectively. In this paper, the seismic response characteristics of prestressed large-span subway station structures without medium columns are studied, and the failure mode and weak position distribution characteristics of prestressed large-span subway stations without medium columns are obtained. The main research contents are as follows: 1. The soil constitutive model, concrete dynamic plastic damage constitutive model and its principle for soil-structure dynamic interaction analysis are introduced, and the numerical model treatment method of soil-structure interface is presented. The dynamic characteristics of boundary conditions such as fixed boundary, viscous boundary, infinite element boundary and viscoelastic boundary are compared, and the dynamic characteristics of free site under different wave input modes are analyzed. The conversion method of static and dynamic artificial boundary conditions is realized in the finite element software ABAQUS, and the reliability of the static and dynamic artificial boundary condition conversion method is verified. 3. The damage constitutive model of dynamic plastic concrete is adopted. The nonlinear and fatigue behavior of concrete under cyclic load is described by using the tension-compression damage factor. The soil-structure deadweight stress, the reinforced concrete prestressing force and the damping effect of subway station structure before earthquake are considered synthetically. The nonlinear numerical simulation of soil-subway structure interaction is carried out. The dynamic stress concentration of long-span prestressed subway station structure is analyzed when the earthquake damage occurs, and the failure process, failure form and seismic weak position of this kind of station structure are obtained. A reasonable explanation is given. 4. Comparing the structure of two long span subway stations to that of double-deck three-span island subway stations, the seismic response analysis is carried out under static force, and the acceleration responses of different positions are compared. Crack generation and development, stress response and other factors. The seismic behavior of two prestressed long-span subway stations is comprehensively evaluated, and the optimal selection of structures is suggested.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U231.4;TU311.3

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 何偉;地下結(jié)構(gòu)地震響應(yīng)及其與地表建筑的影響研究[D];大連理工大學(xué);2011年

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本文編號(hào)：1895104