預應力混凝土連續(xù)梁橋病害分析及體外預應力加固研究
本文選題：下?lián)?/strong> + 徐變��； 參考：《哈爾濱工業(yè)大學》2014年碩士論文
【摘要】：在最近二三十年來，，PC連續(xù)梁橋由于其跨越能力強、受力性能好以及外觀優(yōu)美等優(yōu)點在我國發(fā)展迅速，但是其普遍存在下?lián)线^大以及開裂等病害。本文從設(shè)計角度分析出現(xiàn)這些病害的原因，具體從混凝土徐變效應和箱梁剪力滯效應的角度進行分析，為設(shè)計提供一定參考。 通過對箱梁的受力特性以及PC梁橋下?lián)系某梢蜻M行了深入的討論，得出對于徐變效應的計算分析不準確是目前大跨PC梁橋下?lián)线^大的主要原因之一，深入研究了目前常用橋梁設(shè)計軟件計算徐變效應的方法及其存在的缺陷，提出并實現(xiàn)了基于ANSYS采用三維實體單元并計入預應力筋松弛過程影響的計算PC梁橋徐變效應方法，并對三股線高架橋的徐變效應進行了分析，得出了對設(shè)計有一定參考價值的結(jié)論。 對PC箱梁橋常見裂縫及成因進行了討論與分析，分析了剪力滯效應對箱梁橋的影響，并認為剪力滯效應對箱梁橋的裂縫有重要影響，詳細分析了三股線高架橋的剪力滯效應，并研究了寬跨比、頂板厚度、上翼板懸臂長度、腹板傾斜情況對剪力滯效應的影響，結(jié)果表明，寬跨比以及上翼板懸臂長度對剪力滯效應的影響較為顯著。從減小剪力滯效應的角度出發(fā)，提出了有一定價值的設(shè)計建議。 對于目前常用的橋梁加固方法進行了研究和探討，分析了體外預應力加固法的一些關(guān)鍵技術(shù)問題。對三股線高架橋進行體外預應力加固，結(jié)果表明，該方法能有效的糾正撓度，加固效果明顯。
[Abstract]:In recent twenty or thirty years, continuous beam bridge with PC has developed rapidly in our country because of its strong span ability, good mechanical performance and beautiful appearance, but there are many diseases such as overdeflection and cracking. In this paper, the causes of these diseases are analyzed from the point of view of design, and the concrete creep effect and the shear lag effect of box girder are analyzed in detail, which provides a certain reference for the design. Based on the deep discussion of the stress characteristics of box girder and the cause of the underdeflection of PC girder bridge, it is concluded that the inaccurate calculation and analysis of creep effect is one of the main reasons for the excessive underdeflection of PC girder bridge with long span at present. In this paper, the method of calculating creep effect of bridge design software is studied in detail, and the method of calculating creep effect of PC beam bridge based on ANSYS is proposed and realized, which takes into account the relaxation process of prestressed tendons. The creep effect of three strands viaduct is analyzed. The common cracks and their causes of PC box girder bridge are discussed and analyzed. The influence of shear lag effect on box girder bridge is analyzed. It is considered that shear lag effect has an important effect on the crack of box girder bridge, and the shear lag effect of three strands viaduct is analyzed in detail. The effects of the ratio of width to span, the thickness of roof, the length of the cantilever of the upper wing and the inclination of the web on the shear lag effect are studied. The results show that the ratio of width to span and the length of the cantilever of the upper wing have a significant effect on the shear lag effect. From the point of view of reducing shear lag effect, some valuable design suggestions are put forward. In this paper, the commonly used bridge reinforcement methods are studied and discussed, and some key technical problems of external prestressing reinforcement method are analyzed. Three strands viaduct is strengthened by external prestressing. The results show that the method can correct deflection effectively and the effect of reinforcement is obvious.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.7
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