【摘要】：混凝土連續(xù)箱梁橋具有橋面接縫少、剛度大、整體性強、外形美觀、便于養(yǎng)護(hù)等優(yōu)點，廣泛應(yīng)用于大跨徑橋梁、平面彎橋和交通擁擠地區(qū)的窄橋，在城市交通和高鐵建設(shè)中亦大量使用。隨著交通量的不斷加大，混凝土薄壁箱梁結(jié)構(gòu)的扭轉(zhuǎn)問題和力學(xué)穩(wěn)定問題也越來越受到科研工作者和設(shè)計者的重視。 本文研究了混凝土薄壁箱梁空間的扭轉(zhuǎn)問題和橫向穩(wěn)定問題。從最基本的自由扭轉(zhuǎn)理論開始，系統(tǒng)地闡述薄壁箱梁的扭轉(zhuǎn)理論。著重分析箱梁扭轉(zhuǎn)分析中重要的組成部分 畸變效應(yīng)，利用多種分析理論方法來分析實例并對結(jié)果進(jìn)行對比，加深對理論的認(rèn)識。利用ANSYS軟件SHELL63單元模擬真實的橋梁，模擬多跨箱梁橋在受到多種偏心荷載工況下橋梁受到約束扭轉(zhuǎn)產(chǎn)生的應(yīng)力應(yīng)變和畸變效應(yīng);在三維空間對箱梁橋的扭轉(zhuǎn)和畸變進(jìn)行分析，討論影響橋梁扭轉(zhuǎn)畸變效應(yīng)的因素，得出了畸變效應(yīng)與箱梁約束、箱梁截面關(guān)鍵點、箱梁尺寸之間的關(guān)系，橫隔板對箱梁畸變的控制等結(jié)論。 此外，本文結(jié)合扭轉(zhuǎn)理論分析方法，對多跨連續(xù)獨墩箱梁橋這一橋型的橫向穩(wěn)定進(jìn)行分析。對影響箱梁橋穩(wěn)定性的因素及程度進(jìn)行總結(jié)，得出結(jié)論：當(dāng)超載倍數(shù)達(dá)2倍以上時，橋梁穩(wěn)定安全系數(shù)沿曲線下降，變化較快。并對此類橋型在如何防止出現(xiàn)安全穩(wěn)定事故尤其是整體傾覆事故提出一些改進(jìn)的建議。 文章的主要創(chuàng)新點： 1.詳述解決箱梁扭轉(zhuǎn)和畸變問題的不同理論和方法，通過分析對比對不同方法的適用性和適用范圍提出建議，具有實際意義。 2.利用SHELL63單元進(jìn)行空間全橋結(jié)構(gòu)有限元分析，，效果顯著。有限元得出的數(shù)據(jù)與經(jīng)典理論得出的數(shù)據(jù)做對比，最終得出結(jié)論和規(guī)律。 3.從“空間”、“整體”角度分析獨墩式多跨連續(xù)箱梁橋的穩(wěn)定性，分析影響穩(wěn)定性的因素和程度，對此類橋梁橫向穩(wěn)定提出改進(jìn)建議。
[Abstract]:The concrete continuous box girder bridge has the advantages of less joints, large stiffness, strong integrity, beautiful appearance and convenient maintenance. It is widely used in long span bridges, plane curved bridges and narrow bridges in congested areas. It is also widely used in urban transportation and high-speed railway construction. With the increasing traffic volume, the torsion and mechanical stability of concrete thin-walled box girder structures are paid more and more attention by researchers and designers. In this paper, the problem of torsion and lateral stability of concrete thin-walled box girder space is studied. From the basic theory of free torsion, the torsion theory of thin-walled box girder is systematically expounded. The distortion effect, which is an important part of box girder torsion analysis, is analyzed in detail. Several analytical methods are used to analyze the examples and the results are compared to deepen the understanding of the theory. The ANSYS software SHELL63 element is used to simulate the real bridge, and the stress-strain and distortion effect of multi-span box girder bridge under various eccentric load and torsion is simulated. The torsion and distortion of box girder bridge are analyzed in three dimensional space, and the factors influencing the torsional distortion effect of bridge are discussed. The relationship between distortion effect and box girder constraint, key points of box girder section and box girder size is obtained. The control of the box girder distortion by the transverse diaphragm and so on. In addition, the lateral stability of multi-span continuous box girder bridge with single pier is analyzed by using torsional theory. The factors affecting the stability of box-girder bridge are summarized and the conclusion is drawn: when the overload ratio is more than 2 times, the safety factor of bridge stability decreases along the curve and changes rapidly. Some suggestions on how to prevent the occurrence of safety and stability accidents, especially the overall overturning accidents, are put forward. The main innovation points of this paper are as follows: 1. Different theories and methods to solve the problem of torsion and distortion of box girder are described in detail. It is of practical significance to put forward suggestions on the applicability and scope of application of different methods through analysis and comparison. 2. The finite element analysis of spatial full bridge structure with SHELL63 element is effective. The data obtained by finite element method are compared with those obtained by classical theory, and the conclusion and law are obtained. 3. This paper analyzes the stability of single-pier multi-span continuous box girder bridge from the angle of "space" and "whole", analyzes the factors and degree of influencing the stability, and puts forward some suggestions for improving the lateral stability of this kind of bridge.
【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】：U448.213;U441

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