本文關(guān)鍵詞： 矮墩三跨剛構(gòu)-連續(xù)組合梁橋 有限元 收縮徐變 預(yù)應(yīng)力損失　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國(guó)橋梁事業(yè)快速發(fā)展，預(yù)應(yīng)力混凝土連續(xù)梁橋和預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋已經(jīng)成為最常見(jiàn)和廣泛應(yīng)用的兩種橋型。然而這兩種橋型都有其適用的局限性，連續(xù)梁橋需要設(shè)置支座，而連續(xù)剛構(gòu)橋的主墩雖不用設(shè)置支座，但其內(nèi)力受溫度變化和混凝土收縮徐變等因素影響很大。針對(duì)這兩種橋型各自的特點(diǎn)，出現(xiàn)了一種將連續(xù)剛構(gòu)橋和連續(xù)梁橋組合的新型橋梁結(jié)構(gòu)體系，并稱之為剛構(gòu)-連續(xù)組合梁橋。 剛構(gòu)-連續(xù)組合梁橋通常是在一聯(lián)連續(xù)梁中部一跨或者數(shù)跨采用橋墩和主梁固結(jié)的形式，其余邊部數(shù)跨設(shè)置支座的連續(xù)梁結(jié)構(gòu)。由于這種橋梁體系是連續(xù)梁橋和連續(xù)剛構(gòu)橋組合而成的結(jié)構(gòu)形式，它兼顧了兩者的優(yōu)點(diǎn)同時(shí)摒棄了單一結(jié)構(gòu)的缺點(diǎn)，因此在結(jié)構(gòu)受力、使用性能有著一定的優(yōu)越性。對(duì)以往的矮墩大跨橋梁結(jié)構(gòu)，通常選用連續(xù)梁橋作為主要橋型設(shè)計(jì)方案。本文以贊比亞西爾馬大橋?yàn)楣こ瘫尘�，并運(yùn)用Midas-Civil有限元分析軟件分別建立了矮墩三跨剛構(gòu)-連續(xù)組合梁橋和連續(xù)梁橋兩種梁橋模型，通過(guò)對(duì)比分析，總結(jié)出矮墩三跨的剛構(gòu)-連續(xù)組合梁橋的特殊的力學(xué)性能，主要完成的工作如下： 1）介紹剛構(gòu)-連續(xù)組合梁橋在國(guó)內(nèi)外的發(fā)展概況和構(gòu)造特點(diǎn)，歸納總結(jié)出連續(xù)梁橋、剛構(gòu)-連續(xù)組合梁橋、連續(xù)剛構(gòu)橋的各自的優(yōu)缺點(diǎn)，簡(jiǎn)述了剛構(gòu)-連續(xù)組合梁橋發(fā)展的方向和存在的問(wèn)題，然后提出本文所研究的主要內(nèi)容。 2）以贊比亞西爾馬大橋?yàn)楣こ瘫尘�，通過(guò)Midas-Civil有限元分析軟件，分別建立了矮墩三跨剛構(gòu)-連續(xù)組合梁橋和連續(xù)梁橋分析模型，在各種設(shè)計(jì)荷載及最不利荷載組合作用下，對(duì)兩種橋型主梁內(nèi)力、位移及應(yīng)力分布情況對(duì)比分析，并對(duì)兩種橋型進(jìn)行結(jié)構(gòu)應(yīng)力、抗裂性及撓度驗(yàn)算，，通過(guò)本文的研究，分析總結(jié)出矮墩三跨剛構(gòu)-連續(xù)組合梁橋的力學(xué)性能。 3）矮墩三跨剛構(gòu)-連續(xù)組合梁橋受橋墩不均勻沉降、混凝土的收縮徐變、預(yù)應(yīng)力損失、環(huán)境溫度變化等各種因素影響比較大，分析總結(jié)出在各種因素作用下，該橋型應(yīng)力和撓度的變化情況，并找出受力的最不利截面位置，得出相關(guān)結(jié)論。
[Abstract]:With the rapid development of bridges in China, prestressed concrete continuous beam bridges and prestressed concrete continuous rigid frame bridges have become the two most common and widely used bridges. Continuous beam bridge needs to be supported, but the main pier of continuous rigid frame bridge does not need to be supported, but its internal force is greatly affected by temperature change and concrete shrinkage and creep. A new type of bridge structure system, which combines continuous rigid frame bridge and continuous beam bridge, is presented, which is called rigid frame continuous composite beam bridge. Rigid frame-continuous composite beam bridge is usually in the middle of a continuous beam one span or several spans of the bridge pier and main beam consolidation form. Because this kind of bridge system is composed of continuous beam bridge and continuous rigid frame bridge, it takes into account the advantages of both and abandons the shortcoming of single structure. Therefore, in the structural force, performance has certain advantages. For the previous long-span bridge structure with short piers, the continuous beam bridge is usually selected as the main bridge design. This paper takes Silma Bridge in Zambia as the engineering background. The Midas-Civil finite element analysis software is used to establish two kinds of beam bridge models, which are the three-span rigid frame-continuous composite beam bridge with low pier and the continuous beam bridge respectively, and the comparison analysis is carried out. The special mechanical properties of the rigid frame-continuous composite beam bridge with short piers and three spans are summarized. The main work accomplished is as follows: 1) introduce the development and structural characteristics of rigid-continuous composite beam bridge at home and abroad, sum up the advantages and disadvantages of continuous beam bridge, rigid frame-continuous composite beam bridge and continuous rigid frame bridge. In this paper, the development direction and existing problems of rigid-frame continuous composite beam bridges are briefly described, and the main contents of this paper are put forward. 2) taking the Silma Bridge in Zambia as the engineering background, through the Midas-Civil finite element analysis software, the analysis models of the three-span rigid frame-continuous composite beam bridge with low pier and continuous beam bridge are established respectively. Under the combination of various design loads and most unfavorable loads, the internal force, displacement and stress distribution of the two kinds of bridge girder are compared and analyzed, and the structural stress, crack resistance and deflection of the two kinds of bridges are checked and calculated. Through the research in this paper, the mechanical properties of three-span rigid-frame-continuous composite beam bridge with short pier are analyzed and summarized. 3) Three-span rigid frame-continuous composite beam bridge with short piers is affected by various factors such as uneven settlement of pier, shrinkage and creep of concrete, loss of prestress, change of environment temperature and so on. The variation of stress and deflection of the bridge is analyzed and summarized under the action of various factors, and the most unfavorable section position of the force is found out, and the relevant conclusions are drawn.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441

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本文編號(hào)：1445709