【摘要】：鋼管混凝土拱橋造型優(yōu)美，受力合理，施工方便，近些年在國(guó)內(nèi)外得到了迅速的發(fā)展。隨著鋼管混凝土拱橋跨度逐步加大和結(jié)構(gòu)越來(lái)越復(fù)雜，施工難度也逐步增加。為確保成橋狀態(tài)滿足設(shè)計(jì)要求，在施工過(guò)程中采取施工控制顯得尤為重要。本文以欽州欽江特大橋?yàn)楣こ瘫尘�，�?duì)施工控制過(guò)程中的關(guān)鍵問(wèn)題進(jìn)行了研究，主要內(nèi)容如下： （1）簡(jiǎn)要介紹了鋼管混凝土拱橋的發(fā)展歷程、研究現(xiàn)狀以及存在的若干問(wèn)題，簡(jiǎn)述了鋼管混凝土拱橋的發(fā)展前景�？偨Y(jié)了對(duì)大型橋梁實(shí)行施工監(jiān)控的目的意義，還有施工監(jiān)控的理論和方法。 （2）從介紹拱橋的施工方法入手，分析了各種施工方法與適用范圍，結(jié)合欽江特大橋詳細(xì)介紹了斜拉掛扣法的施工步驟，包括拱肋架設(shè)方法和混凝土灌注方法。 （3）簡(jiǎn)述了鋼管混凝土拱橋的施工計(jì)算方法和理論。結(jié)合欽江特大橋介紹了需要進(jìn)行施工計(jì)算的內(nèi)容. （4）闡述了鋼管混凝土拱橋的施工控制分析方法。詳細(xì)介紹了本文所要用的BP神經(jīng)網(wǎng)絡(luò)和遺傳算法優(yōu)化的原理和步驟。 （5）以欽江特大橋?yàn)楣こ瘫尘�，采用正交試�?yàn)設(shè)計(jì)方法對(duì)本文索要優(yōu)化的扣索索力進(jìn)行正交設(shè)計(jì)，將正交設(shè)計(jì)出來(lái)的每一組扣索索力帶入MIDAS模型當(dāng)中計(jì)算，得到多組輸入輸出樣本。以扣索索力作為輸入樣本，，控制截面的位移作為輸出樣本，采用BP神經(jīng)網(wǎng)絡(luò)對(duì)這些樣本進(jìn)行訓(xùn)練，并結(jié)合遺傳算法尋找出最優(yōu)索力。將遺傳算法得到的最優(yōu)索力反帶入模型，比較神經(jīng)網(wǎng)絡(luò)訓(xùn)練出來(lái)的結(jié)果和模型計(jì)算出的結(jié)果，驗(yàn)證本文的索力優(yōu)化方法是合理有效的，滿足精度要求。 （6）提出兩種不同灌注順序，并從弦桿的應(yīng)力儲(chǔ)備和灌注過(guò)程中的穩(wěn)定性方面分析兩種灌注順序。 （7）分析對(duì)比欽江特大橋施工過(guò)程中位移和應(yīng)力的實(shí)測(cè)值和和設(shè)計(jì)值，表明優(yōu)化結(jié)果滿足施工控制需要。
[Abstract]:The steel tube concrete arch bridge is beautiful in shape, reasonable in stress and convenient to construct, and has been developed rapidly and abroad in recent years. As the span of the steel pipe concrete arch bridge is gradually increased and the structure is becoming more and more complex, the construction difficulty is gradually increased. In order to ensure that the bridge state meets the design requirements, it is particularly important to take the construction control during the construction process. Taking the Qinzhou Qinjiang River Bridge as the engineering background, the key problems in the construction control process are studied. The main contents are as follows: (1) The development course, the present situation and the existing problems of the CFST arch bridge are introduced in brief. In this paper, the development of CFST arch bridge is described. The purpose of the construction monitoring for large-scale bridges is summarized, and the theory and party of construction monitoring are also discussed. (2) Starting with the introduction of the construction method of the arch bridge, the construction method and the application scope of the arch bridge are analyzed, and the construction steps of the pull-and-pull method are described in detail in connection with the Qinjiang River Bridge, including the method for erecting the arch rib and the concrete pouring. (3) The construction and calculation of the CFST arch bridge are briefly described. Methods and theories. The construction is introduced in combination with the Qinjiang River Bridge. The application of steel pipe concrete arch bridge is described in (4). The paper introduces the BP neural network and the genetic algorithm to be used in this paper. (5) Based on the engineering background of the Qinjiang River Bridge, the orthogonal design method is adopted to design the optimized buckling cable force in this paper, and each set of buckling cables designed by the orthogonal design is brought into the MIDAS model to be calculated. and using the BP neural network to train the samples, and combining with the genetic algorithm, The optimal cable force is found by the algorithm. The optimal cable force obtained by the genetic algorithm is brought into the model, and the results of the neural network training and the results calculated by the model are compared. It is effective to meet the requirements of precision. (6) Two different perfusion sequences are proposed, and the stability of the stress and the perfusion of the chord is obtained. (7) Analysis of the measured value and design value of displacement and stress in the construction process of the comparative Qinjiang River Bridge, and the table
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.4;U448.22

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