本文選題：鋼筋混凝土拱橋　切入點(diǎn)：施工階段　出處：《長安大學(xué)》2014年碩士論文

【摘要】：隨著交通建設(shè)的蓬勃發(fā)展和近些年西部大開發(fā)的戰(zhàn)略實(shí)施，大跨度的鋼筋混凝土拱橋在中國西部地區(qū)得到了飛速的發(fā)展，對其施工階段的力學(xué)行為研究和成橋狀態(tài)下的極限承載力分析具有重要的理論意義和實(shí)用價(jià)值。本文總結(jié)和歸納了目前國內(nèi)外學(xué)者對拱橋極限承載力的研究現(xiàn)狀，，介紹了拱橋的穩(wěn)定理論、非線性分析有限元理論及非線性問題的求解方法。結(jié)合背景工程馬蹄河特大橋，應(yīng)用有限元軟件Midas/Civil基于影響矩陣的未知荷載系數(shù)法對懸臂澆筑施工階段的扣、錨索索力進(jìn)行了優(yōu)化，主拱圈合攏之后，對其扣、錨索的拆除順序進(jìn)行了探討，對該橋施工過程的穩(wěn)定性進(jìn)行了分析。采用ANSYS程序建立有限元計(jì)算模型，對該橋成橋狀態(tài)下的第一類彈性穩(wěn)定進(jìn)行了分析，同時(shí)研究不同加載方式、矢跨比、拱圈面內(nèi)抗彎剛度對該橋第一類穩(wěn)定性的影響。分別就該橋在恒載作用下的彈性屈曲問題、第二類彈性穩(wěn)定問題（幾何非線性問題）以及極限承載力問題進(jìn)行了分析，并對達(dá)到極限荷載時(shí)的破壞過程和破壞形式進(jìn)行了分析。影響大跨度鋼筋混凝土拱橋極限承載力的因素很多，主要分為荷載形式、結(jié)構(gòu)設(shè)計(jì)參數(shù)和初始幾何缺陷三大類，通過對馬蹄河特大橋的上述參數(shù)分析來尋求影響其極限承載力的關(guān)鍵因素，為其設(shè)計(jì)和施工提供有力的支撐。
[Abstract]:With the vigorous development of traffic construction and the implementation of the strategy of western development in recent years, the long-span reinforced concrete arch bridge has developed rapidly in western China. It is of great theoretical significance and practical value to study the mechanical behavior in the construction stage and to analyze the ultimate bearing capacity under the condition of the completed bridge. This paper summarizes and summarizes the current research situation of the ultimate bearing capacity of arch bridge at home and abroad. The stability theory of arch bridge, the finite element theory of nonlinear analysis and the solving method of nonlinear problem are introduced. Using the finite element software Midas/Civil based on the unknown load coefficient method of influence matrix, the buckle and cable force in cantilever construction stage are optimized. After the main arch ring is closed, the order of buckle and the removal of anchor cable are discussed. The stability of the bridge during construction is analyzed. The finite element calculation model is established by using ANSYS program, and the first kind of elastic stability of the bridge under the condition of bridge completion is analyzed. At the same time, the different loading modes, the rise-span ratio, are studied. The influence of in-plane bending stiffness of arch ring on the stability of the first type of the bridge is analyzed. The elastic buckling problem of the bridge under dead load, the second kind of elastic stability problem (geometric nonlinear problem) and the ultimate bearing capacity are analyzed respectively. The failure process and failure form of long-span reinforced concrete arch bridge are analyzed. There are many factors affecting ultimate bearing capacity of long-span reinforced concrete arch bridge, which are mainly divided into three categories: load form, structural design parameters and initial geometric defects. By analyzing the above parameters of Mati River Bridge, the key factors affecting the ultimate bearing capacity of the bridge are found, which can provide strong support for the design and construction of the 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】：U448.22;U441

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