【摘要】：在系桿拱橋的組成構(gòu)件中，吊桿是橋面與拱肋聯(lián)系的傳遞構(gòu)件。橋面系的恒活載都是通過吊桿傳遞給拱肋的，吊桿索力值影響著整個(gè)結(jié)構(gòu)的受力。橋梁結(jié)構(gòu)的體系確定之后，結(jié)構(gòu)的受力主要是由吊桿索力值來決定，可以通過調(diào)節(jié)吊桿索力值來改變結(jié)構(gòu)的受力狀態(tài)。因此進(jìn)行系桿拱橋索力優(yōu)化對結(jié)構(gòu)受力來講是很有必要的。系桿拱橋的索力優(yōu)化不僅要滿足成橋狀態(tài)受力合理，還要保證施工及運(yùn)營階段的安全，故進(jìn)行施工階段合理索力確定也是很重要的。 本文以跨烏魯木齊河特大橋1-128m系桿拱橋施工監(jiān)控為工程背景，對其成橋狀態(tài)下的合理恒載索力進(jìn)行了優(yōu)化研究，探討分析了施工階段的合理施工索力，主要進(jìn)行了如下工作： （1）闡述了系桿拱橋的分類和特點(diǎn)，簡要介紹了索力優(yōu)化的概念。 （2）介紹了跨烏魯木齊河特大橋1-128m系桿拱橋有限元模型建立過程，利用有限元軟件Midas/Civil建立計(jì)算模型。總結(jié)了近年來成橋恒載索力優(yōu)化方法研究現(xiàn)狀，并對各種方法進(jìn)行了對比，分析了其優(yōu)缺點(diǎn)�？偨Y(jié)歸納了系桿拱橋合理施工索力確定的方法，并對每種方法進(jìn)行了評述。 （3）運(yùn)用有約束的最小能量法來進(jìn)行跨烏魯木齊河特大橋1-128m系桿拱橋索力優(yōu)化，目標(biāo)函數(shù)選系桿拱橋主梁和拱肋的拉壓及彎曲應(yīng)變能之和，以吊桿索力上下限及主梁彎矩為約束條件，利用二次規(guī)劃法對成橋吊桿力進(jìn)行調(diào)整，借助Matlab優(yōu)化工具箱來編寫計(jì)算程序進(jìn)行求解，從而求得滿足控制條件的合理成橋索力。 （4）以剛性支承連續(xù)梁法計(jì)算確定吊桿初次張拉索力，并對計(jì)算結(jié)果進(jìn)行了分析，指出了算法的不合理性；擬定了兩種吊桿張拉順序，，利用正裝迭代法計(jì)算吊桿合理施工索力，對計(jì)算結(jié)果進(jìn)行分析，探討了不同張拉順序的優(yōu)缺點(diǎn)；運(yùn)用影響矩陣法來確定施工階段第二次吊桿張拉力，成功實(shí)現(xiàn)了吊桿僅需要張拉兩次就可以使吊桿索力達(dá)到成橋設(shè)計(jì)值。 （5）闡述了相似理論的概念；根據(jù)相似理論，按1/16的相似比制作了跨烏魯木齊河特大橋1-128m系桿拱橋縮尺模型，對縮尺模型進(jìn)行合理成橋索力及合理施工索力確定；經(jīng)過縮尺模型索力張拉試驗(yàn)，采集索力及應(yīng)力數(shù)據(jù)，對實(shí)測值與理論值進(jìn)行比較。 最后對本文的主要結(jié)論和創(chuàng)新點(diǎn)進(jìn)行了闡述，且對未來的研究工作進(jìn)行了展望。
[Abstract]:In the component of tied arch bridge, the suspender is the transfer member of the connection between deck and arch rib. The dead load of bridge deck system is transmitted to the arch rib through the suspender, and the cable force of the suspender affects the force of the whole structure. After the system of bridge structure is determined, the force of the structure is mainly determined by the cable force value of the suspension rod, and the stress state of the structure can be changed by adjusting the cable force value of the suspension rod. Therefore, it is necessary to optimize the cable force of tied arch bridge. The optimization of cable force of tied arch bridge should not only satisfy the reasonable state of the bridge, but also ensure the safety of the construction and operation stage, so it is also very important to determine the reasonable cable force in the construction stage. In this paper, based on the engineering background of construction monitoring of 1-128m tied arch bridge across Urumqi River, the rational dead load cable force under the condition of the completed bridge is studied optimally, and the reasonable construction cable force in the construction stage is discussed and analyzed. The main works are as follows: (1) the classification and characteristics of tied arch bridge are expounded, and the concept of cable force optimization is briefly introduced. (2) the process of establishing finite element model of 1-128m tied arch bridge over Urumqi River is introduced. The finite element software Midas / Civil is used to build the calculation model. This paper summarizes the research status of cable force optimization method of bridge under dead load in recent years, compares various methods, and analyzes their advantages and disadvantages. This paper summarizes and summarizes the methods of determining the rational construction cable force of tied arch bridge, and comments on each method. (3) using the constrained minimum energy method to optimize the cable force of 1-128m tied arch bridge over Urumqi River Bridge. The objective function is to select the sum of tension and compression and bending strain energy of the main girder and arch rib of tied arch bridge. With the upper and lower limits of cable force of suspension rod and the moment of main beam as the constraint conditions, the suspension force of the bridge is adjusted by quadratic programming method. With the help of Matlab optimization toolbox, the calculation program is compiled to solve the problem, so as to obtain the reasonable cable force of the bridge which meets the control conditions. (4) the initial tension force of the suspension rod is determined by the rigid support continuous beam method, and the calculation results are analyzed. The irrationality of the algorithm is pointed out, the tension sequence of two kinds of suspenders is drawn up, the rational construction cable force is calculated by means of formal iteration method, the calculation results are analyzed, and the advantages and disadvantages of different tension sequences are discussed. The influence matrix method is used to determine the second tension of the suspension rod in the construction stage, and it is successfully realized that the cable force of the suspender can reach the design value of the bridge with only two tensionings. (5) the concept of the similarity theory is expounded, according to the similarity theory, the cable force of the suspension rod can reach the design value of the bridge. According to the similarity ratio of 1 / 16, the scale model of 1-128m tied arch bridge of Urumqi River Bridge is made, and the rational cable force and construction cable force of the scale model are determined, and the cable force and stress data are collected through the cable tension test of the scale model. The measured values are compared with the theoretical values. Finally, the main conclusions and innovations of this paper are described, and the future research work is prospected.
【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)】：U445.4;U448.225

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 楊興;張敏;周水興;;影響矩陣法在斜拉橋二次調(diào)索中的應(yīng)用[J];重慶交通大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年03期

2 梁志廣,李建中,石現(xiàn)峰;斜拉橋施工初始索力的確定[J];工程力學(xué);2000年03期

3 秦順全;;無應(yīng)力狀態(tài)控制法斜拉橋安裝計(jì)算的應(yīng)用[J];橋梁建設(shè);2008年02期

4 夏e

本文編號(hào)：2122960