本文選題：施工控制 + 無應(yīng)力狀態(tài)法　； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：鋼管混凝土拱橋憑借著跨越長度大、造型優(yōu)美等特點在我國快速發(fā)展起來,是較為常用的橋梁結(jié)構(gòu)形式之一。但目前圍繞著鋼管混凝土拱橋相關(guān)的施工控制的研究還相對較少。無應(yīng)力狀態(tài)法是施工控制其中的一種計算方法,其利用無應(yīng)力的狀態(tài)量將施工的過程和成橋的狀態(tài)聯(lián)系起來,具有概念明確、計算便利、施工自由度大等特點。為此對鋼管混凝土拱橋采用無應(yīng)力狀態(tài)法進行施工控制的相關(guān)研究,開展了以下工作：1.闡述了鋼管混凝土拱橋的產(chǎn)生與發(fā)展的狀況,重點介紹了施工控制發(fā)展現(xiàn)狀的研究以及無應(yīng)力狀態(tài)法在施工控制中的應(yīng)用發(fā)展。2.介紹了無應(yīng)力狀態(tài)法在施工控制中的基礎(chǔ)理論,闡述了兩個基本無應(yīng)力狀態(tài)量：無應(yīng)力長度和無應(yīng)力曲率；陳述了無應(yīng)力狀態(tài)法的特點以及相比于其他方法的優(yōu)點；明確了無應(yīng)力狀態(tài)法在鋼管混凝土拱橋中的應(yīng)用思路。3.利用剛性吊桿法確定成橋索力后,通過影響矩陣對索力進行優(yōu)化,再考慮混凝土收縮徐變和活載的影響后最終得到合理的成橋狀態(tài),進而計算出鋼管拱和系梁的無應(yīng)力線形以及吊桿的無應(yīng)力長度。4.把遺傳算法和BP神經(jīng)網(wǎng)絡(luò)兩種方法相結(jié)合,用遺傳算法優(yōu)化后的BP神經(jīng)網(wǎng)絡(luò)進行參數(shù)的識別工作。5.在論述吊桿的無應(yīng)力長度發(fā)生改變時,分析了不同位置處的吊桿無應(yīng)力長度的改變在成橋狀態(tài)時所引起拱肋、系梁以及吊桿索力的改變,并總結(jié)了其變化規(guī)律特征。6.討論了鋼管拱肋以及系梁的無應(yīng)力線形突變時對成橋狀態(tài)的改變,并總結(jié)了其變化規(guī)律特征。
[Abstract]:Concrete-filled steel tubular (CFST) arch bridge has been developed rapidly in our country by virtue of its long span and graceful shape. It is one of the most commonly used bridge structures. However, the research on construction control of concrete-filled steel tubular arch bridge is relatively rare. The stress-free state method is one of the calculation methods in construction control. It uses the unstressed state quantity to connect the construction process with the state of the bridge, which has the characteristics of clear concept, convenient calculation, large degree of freedom in construction and so on. In this paper, the construction control of concrete-filled steel tubular arch bridge is studied by using stress-free state method, and the following work is carried out: 1. This paper expounds the status of the emergence and development of concrete-filled steel tubular arch bridge, and emphatically introduces the research on the present situation of construction control and the application development of stress-free state method in construction control. This paper introduces the basic theory of stress-free state method in construction control, expounds two basic stress-free state quantities: unstressed length and stress-free curvature, describes the characteristics of stress-free state method and its advantages compared with other methods. The application of stress-free state method in concrete-filled steel tubular arch bridge is clarified. After determining the cable force of the bridge by using the rigid suspender method, the cable force is optimized by the influence matrix, then the influence of concrete shrinkage, creep and live load is considered, and finally the reasonable bridge state is obtained. Furthermore, the unstressed linear shape of steel tube arch and tie beam and the unstressed length of suspender are calculated. The genetic algorithm and BP neural network are combined, and the optimized BP neural network is used to identify the parameters. In this paper, the change of the unstressed length of the suspender is discussed, and the change of the unstressed length of the suspender at different positions is analyzed, which is caused by the change of the arch rib, the tie beam and the cable force of the suspender when the bridge is completed, and the variation law of the cable force is summarized. This paper discusses the change of the bridge state when the steel pipe arch rib and the tie beam are changed by the unstressed linear mutation, and summarizes the characteristics of the changing law.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4

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本文編號：1980116