本文選題：梁拱組合　切入點：鋼管混凝土　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：梁拱組合橋梁以其兼具梁橋和拱橋的受力特點，越來越多的受到橋梁工作者的青睞。近年來，梁拱組合橋梁如雨后春筍出現(xiàn)在橋梁的工程實踐中，特別是在大跨度的鐵路橋梁，梁拱組合橋梁在安全、適用、經(jīng)濟、美觀四個方面都表現(xiàn)了強勁的競爭力。而鋼管混凝土拱橋以其同時解決高強材料的應(yīng)用和施工兩大難題，在我國得到了迅速的發(fā)展和運用，所以鋼管混凝土拱與梁橋的結(jié)合在梁拱組合橋梁中使用最多。但鋼管混凝土拱梁組合結(jié)構(gòu)在設(shè)計理論的研究還遠遠落后于工程實踐，對這種新穎的組合橋梁的結(jié)構(gòu)性能展開研究具有重要的現(xiàn)實指導(dǎo)意義。 本文以下承式鋼管混凝土拱梁組合橋梁廣元嘉陵江雙線特大橋為工程背景，利用大型有限元軟件Midas/civil對混凝土收縮徐變效應(yīng)進行全橋模擬分析，研究混凝土收縮徐變對鋼管混凝土拱梁組合橋梁結(jié)構(gòu)變形、內(nèi)力的影響以及對截面應(yīng)力重分布的影響規(guī)律，結(jié)果表明： ①主梁撓度在施工階段受混凝土的收縮徐變影響較大，但成橋后主梁撓度變化很小；鋼管混凝土拱肋的撓度在收縮徐變的影響下，變化很小。 ②混凝土的收縮徐變對主梁的內(nèi)力影響不大，但對鋼管混凝土拱肋的拱腳處剪力和彎矩影響很大。 ③全橋混凝土的收縮徐變對主梁的截面縱向應(yīng)力的影響并不明顯，成橋后截面縱向壓應(yīng)力幾乎都將出現(xiàn)不斷減少的趨勢，但應(yīng)力的改變值和改變比例都不大；管內(nèi)混凝土的收縮徐變使得鋼管混凝土拱發(fā)生明顯的截面應(yīng)力重分布，其結(jié)果導(dǎo)致鋼管截面應(yīng)力越來越大，管內(nèi)混凝土截面應(yīng)力越來越小。 開展對鋼管混凝土拱梁組合橋梁收縮徐變效應(yīng)的參數(shù)分析，探討不同橋面系恒載、鋼管截面剛度引起收縮徐變效應(yīng)的不同。橋面系恒載越大，收縮徐變效應(yīng)越明顯；鋼管截面剛度不同，，收縮徐變效應(yīng)也會表現(xiàn)很大差別。
[Abstract]:Beam-arch composite bridges are more and more favored by bridge workers for their characteristics of both beam bridge and arch bridge. In recent years, beam-arch composite bridges have sprung up in the engineering practice of bridges, especially in long-span railway bridges. The beam-arch composite bridge has shown strong competitiveness in four aspects: safety, applicability, economy and beauty, while concrete filled steel tubular arch bridge has been developed and applied rapidly in China because of its simultaneous solution to the two major problems of the application and construction of high-strength materials. Therefore, the combination of concrete-filled steel tube arch and beam bridge is widely used in beam-arch composite bridge, but the research on the design theory of concrete-filled steel tube arch beam composite structure is still far behind the engineering practice. It is of great practical significance to study the structural performance of this novel composite bridge. In this paper, the through concrete filled steel tube arch beam composite bridge Guangyuan Jialing River double-line large bridge is used as the engineering background, the full-bridge simulation analysis of concrete shrinkage and creep effect is carried out by using the large-scale finite element software Midas/civil. The influence of concrete shrinkage and creep on the deformation and internal force of concrete filled steel tube arch beam composite bridge and the influence on the stress redistribution of section are studied. The results show that:. The deflection of the main beam is greatly affected by the shrinkage and creep of concrete in the construction stage, but the deflection of the main beam after completion of the bridge is very small, and the deflection of the arch rib of concrete-filled steel tube is very small under the influence of the shrinkage and creep. (2) the shrinkage and creep of concrete have little effect on the internal force of the main beam, but have great influence on the shear force and bending moment at the arch foot of the concrete filled steel tube arch rib. (3) the effect of shrinkage and creep of the whole bridge concrete on the longitudinal stress of the main beam is not obvious. The longitudinal compressive stress of the section after the completion of the bridge will almost appear a decreasing trend, but the change value of the stress and the proportion of the change are not obvious. The shrinkage and creep of concrete in pipe make the section stress redistribution of concrete filled steel tube arch. The result is that the section stress of steel tube becomes larger and larger, and the stress of concrete section in pipe becomes smaller and smaller. The parameter analysis of shrinkage and creep effect of concrete filled steel tube arch beam composite bridge is carried out, and the difference of shrinkage and creep effect caused by steel tube section stiffness under dead load of different deck system is discussed. The larger the dead load of bridge deck system, the more obvious shrinkage and creep effect is. The effect of shrinkage and creep will be very different with different section stiffness of steel pipe.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.22;U441

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