【摘要】：預(yù)應(yīng)力混凝土曲線箱梁橋由于抗扭、抗彎剛度大，整體性好，承載力高，線形美觀，行車(chē)平順，在我國(guó)公路建設(shè)中得到了廣泛應(yīng)用。與常用的直線橋梁相比，由于曲率影響，彎扭耦合作用比較明顯，如果支座設(shè)置不合理，實(shí)際應(yīng)用中易出現(xiàn)橫向偏位等病害。本文以某預(yù)應(yīng)力混凝土連續(xù)彎箱梁橋?yàn)檠芯繉?duì)象，，探討了該橋在地震后發(fā)生主梁、橋墩偏位、支座損壞等病害的原因，并探討了維修加固對(duì)策。 本文首先對(duì)橋梁的病害特征進(jìn)行了詳細(xì)調(diào)查和描述，根據(jù)病害特征，初步判別了橋梁產(chǎn)生病害的主要原因，為后續(xù)的結(jié)構(gòu)內(nèi)力分析提供了依據(jù)。其次，根據(jù)初步判定的主要原因，采用結(jié)構(gòu)分析的方法，對(duì)結(jié)構(gòu)恒載效應(yīng)、預(yù)應(yīng)力效應(yīng)、混凝土徐變效應(yīng)、溫度效應(yīng)、不同等級(jí)的地震效應(yīng)等工況進(jìn)行了數(shù)值分析，研究了不同參數(shù)對(duì)主梁內(nèi)力、支座約束反力的影響，從而為判斷橋梁病害成因提供必要的參考。再次，根據(jù)病害檢測(cè)結(jié)果和結(jié)構(gòu)分析結(jié)果，對(duì)橋梁病害原因進(jìn)行了分析，認(rèn)為橋梁震害的原因主要有三點(diǎn)：地震作用及內(nèi)力累積綜合效應(yīng)、支座限位裝置較弱以及下部結(jié)構(gòu)設(shè)計(jì)不合理，并根據(jù)原因提出了維修加固建議。最后，介紹了依托工程維修加固的原則、方法、主要內(nèi)容、工藝要點(diǎn)及監(jiān)控要點(diǎn)。依托工程實(shí)踐表明，該橋梁主梁、橋墩的糾偏和復(fù)位工程具有工藝可靠、技術(shù)先進(jìn)、施工費(fèi)用低、施工工期短等優(yōu)點(diǎn)，可在同類(lèi)橋梁糾偏和復(fù)位工程中推廣應(yīng)用。
[Abstract]:The prestressed concrete curved box girder bridge has been widely used in highway construction in China because of its torsion, high bending stiffness, good integrity, high bearing capacity, beautiful alignment and smooth running. Compared with the commonly used linear bridges, the coupling effect of bending and torsion is obvious due to the influence of curvature. If the support setting is unreasonable, the transversal deflection and other diseases are easy to occur in practical application. Taking a prestressed concrete continuous curved box girder bridge as the research object, this paper discusses the causes of the main girder, pier deviation and support damage after the earthquake, and discusses the countermeasures for maintenance and reinforcement of the bridge. In this paper, the disease characteristics of the bridge are investigated and described in detail. According to the disease characteristics, the main causes of the bridge diseases are preliminarily identified, which provides the basis for the subsequent structural internal force analysis. Secondly, according to the main reasons of preliminary determination, the structural analysis method is used to analyze the structural dead load effect, prestress effect, concrete creep effect, temperature effect, earthquake effect of different grades and so on. The influence of different parameters on the internal force of the main beam and the constrained reaction force of the bearing is studied, which provides the necessary reference for judging the cause of the bridge disease. Thirdly, according to the results of disease detection and structural analysis, the causes of bridge damage are analyzed. It is concluded that there are three main causes of bridge damage: seismic action and internal force accumulation comprehensive effect. The support limit device is weak and the design of the substructure is unreasonable, and suggestions for maintenance and reinforcement are put forward according to the reasons. Finally, the principle, method, main content, technology and monitoring of maintenance and reinforcement of supporting engineering are introduced. Based on the engineering practice, it is shown that the rectification and restoration of the bridge main girder and pier have the advantages of reliable technology, advanced technology, low construction cost, short construction period and so on, which can be popularized and applied in the similar bridge rectification and restoration projects.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U445.7

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