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  本文選題：大跨徑PC連續(xù)剛構(gòu)橋 + 裂縫　； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：近年來，輕巧纖細(xì)的橋梁結(jié)構(gòu)受到了設(shè)計師們的青睞，并且橋梁的載重和跨徑也在不斷增加。連續(xù)剛構(gòu)橋由于在這些方面有著得天獨厚的優(yōu)勢而被大量采用。但隨著跨徑的不斷增加，在后期運營中梁體開裂等問題也開始顯現(xiàn)，，并存在一定普遍性，因此，對大跨徑PC連續(xù)剛構(gòu)橋的空間受力分析就顯得尤為重要。本文主要完成了如下工作： 1）闡述了連續(xù)剛構(gòu)橋的發(fā)展概況和體系特征，探討了目前連續(xù)剛構(gòu)橋中易出現(xiàn)的跨中下?lián)�、梁體開裂這兩大問題，并提出了對于大跨徑PC連續(xù)剛構(gòu)橋進(jìn)行空間受力分析的必要性和意義。介紹了箱梁空間受力的特點和分析方法以及預(yù)應(yīng)力鋼束的設(shè)計方法和計算理論。 2）以跨徑為55m+2×100m+55m的某座預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋為工程背景，采用有限元軟件Midas/Civil建立了全橋梁單元整體模型，實現(xiàn)了對全橋的整體受力情況的模擬，分析了全橋梁單元模型的靜力特性。 3）采用有限元軟件Midas/FEA對橋梁進(jìn)行局部空間實體單元模型的仿真分析，這里選取了構(gòu)造形式和受力較為復(fù)雜的主墩0號塊以及延伸單元作為研究對象，進(jìn)一步分析了連續(xù)剛構(gòu)橋的空間受力特性，并與梁單元模型作對比分析，結(jié)果表明目前工程設(shè)計常采用的梁單元模型計算并不符合橋梁局部位置的真實受力情況，這也是箱梁容易開裂的原因之一，而實體單元模型則可以反映出箱梁腹板中錨固區(qū)位置等一些特殊截面的局部應(yīng)力。 4）最后詳細(xì)分析了豎向預(yù)應(yīng)力作用下箱梁腹板的受力情況，并研究了豎向預(yù)應(yīng)力鋼筋的作用理論。通過對實體模型的分析，討論了預(yù)應(yīng)力鋼束的預(yù)加應(yīng)力在梁體中存在一定擴(kuò)散角度，并詳細(xì)分析了預(yù)應(yīng)力的擴(kuò)散效應(yīng)，由此找到箱梁腹板存在的預(yù)應(yīng)力盲區(qū)問題。通過對不同間距布置豎向預(yù)應(yīng)力鋼筋的對比分析，研究了在充分考慮預(yù)應(yīng)力的擴(kuò)散效應(yīng)作用下，豎向預(yù)應(yīng)力鋼筋在腹板中的合理間距問題。
[Abstract]:In recent years, the light and slender bridge structure has been favored by designers, and the bridge load and span are increasing. Continuous rigid frame bridges are widely used because of their unique advantages in these aspects. However, with the continuous increase of span, the problems of beam cracking begin to appear in the later period of operation, and there is a certain degree of universality. Therefore, it is particularly important to analyze the spatial force of PC continuous rigid frame bridge with long span. The main work of this paper is as follows: 1) the development situation and system characteristics of continuous rigid frame bridge are expounded, and the two problems, such as deflection in span and beam cracking, which are easy to appear in continuous rigid frame bridge at present, are discussed. The necessity and significance of spatial stress analysis for PC continuous rigid frame bridge with long span are put forward. This paper introduces the characteristics and analysis method of space stress of box girder, the design method and calculation theory of prestressed steel beam. 2) taking a prestressed concrete continuous rigid frame bridge with span of 55m 2 脳 100m 55m as the engineering background. The finite element software Midas / Civil is used to establish the whole model of the whole bridge element. The static characteristics of the whole bridge element model are analyzed. 3) the finite element software Midas / FEA is used to simulate the local spatial solid element model of the bridge. In this paper, the spatial stress characteristics of continuous rigid frame bridge are further analyzed and compared with the beam element model by selecting block 0 of the main pier and the extension element of the main pier with more complicated structural form and force as the research object. The results show that the calculation of beam element model, which is often used in engineering design, does not accord with the actual stress condition of the local position of the bridge, which is one of the reasons why the box girder is prone to crack. The solid element model can reflect the local stress of some special sections such as the anchoring area in the box girder web. 4) finally, the stress of the box girder web under the action of vertical prestress is analyzed in detail. The action theory of vertical prestressed steel bar is also studied. Based on the analysis of solid model, the diffusion angle of prestress of prestressed steel bundle in beam is discussed, and the diffusion effect of prestress is analyzed in detail, and the problem of prestressing blind zone in box girder web is found out. Based on the comparative analysis of the vertical prestressed steel bars with different spacing, the reasonable spacing of the vertical prestressed bars in web plates is studied under the full consideration of the effect of prestress diffusion.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.5;U448.23

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本文編號：1995060