【摘要】：隨著橋梁技術(shù)的不斷發(fā)展,新的橋梁結(jié)構(gòu)形式不斷出現(xiàn)。其中,矮塔斜拉橋是受力介于連續(xù)梁橋與斜拉橋之間的一種新型橋梁結(jié)構(gòu)。由于其塔較矮、梁較剛、無索區(qū)較長,具有性能優(yōu)越、造型美觀、經(jīng)濟指標良好等優(yōu)點,在我國有較快的發(fā)展,在世界各國得到了廣泛的應(yīng)用。針對國內(nèi)外矮塔斜拉橋的現(xiàn)狀,以斜拉橋結(jié)構(gòu)設(shè)計理論為基礎(chǔ),對影響矮塔斜拉橋結(jié)構(gòu)受力特點的結(jié)構(gòu)參數(shù)進行了詳細地分析。首先,以常山大橋為背景,采用橋梁有限元分析軟件Midas/Civil,建立橋梁空間有限元模型,通過橋梁施工階段的模擬,對矮塔斜拉橋合理成橋的基本狀態(tài)進行受力分析,并在此基礎(chǔ)上,分析得到塔高及跨徑對結(jié)構(gòu)受力的敏感程度。然后,結(jié)合有限元的計算進行矮塔斜拉橋結(jié)構(gòu)參數(shù)敏感性分析,重點分析結(jié)構(gòu)參數(shù)的變化對索塔塔頂偏位、主梁線形、內(nèi)力和斜拉索索力的影響,并對矮塔斜拉橋結(jié)構(gòu)參數(shù)的選取進行了探討。根據(jù)各參數(shù)對結(jié)構(gòu)狀態(tài)影響的敏感程度,將結(jié)構(gòu)參數(shù)劃分為主要結(jié)構(gòu)參數(shù)和次要結(jié)構(gòu)參數(shù)。最后,基于主要結(jié)構(gòu)參數(shù)的識別理論,應(yīng)用最小二乘法對常山大橋主要結(jié)構(gòu)參數(shù)進行誤差識別,將識別后的參數(shù)重新帶入控制模型進行計算,使實測值和模擬計算理論值相吻合。根據(jù)修正后的參數(shù)進行下階段施工的預(yù)測,并和實測結(jié)果進行了比較分析,從而成功地將最小二乘法應(yīng)用于矮塔斜拉橋施工控制中。
[Abstract]:With the continuous development of bridge technology, new bridge structure forms appear constantly. Among them, the low tower cable-stayed bridge is a new type of bridge structure between continuous girder bridge and cable-stayed bridge. Because of its short tower, rigid beam, longer cable free zone, superior performance, beautiful shape and good economic index, it has a rapid development in China and has been widely used in the world. Based on the theory of structural design of cable-stayed bridges, the structural parameters which affect the stress characteristics of cable-stayed bridges with low pylon are analyzed in detail according to the present situation of cable-stayed bridges with low pylon at home and abroad. First of all, taking Changshan Bridge as the background, using the finite element analysis software Midas/Civil, to establish the bridge spatial finite element model, through the bridge construction stage simulation, carries on the force analysis to the low tower cable-stayed bridge reasonable completion bridge basic state, and on this foundation, The sensitivity of tower height and span to the stress of the structure is obtained. Then, the sensitivity analysis of the structural parameters of the cable-stayed bridge with low tower is carried out with the finite element method, and the influence of the structural parameters on the top deflection of the tower, the alignment of the main beam, the internal force and the cable force is analyzed. The selection of structural parameters of the cable-stayed bridge with low tower is discussed. According to the sensitivity of each parameter to the structural state, the structural parameters are divided into main structural parameters and secondary structural parameters. Finally, based on the identification theory of main structural parameters, the error identification of the main structural parameters of Changshan Bridge is carried out by using the least square method, and the identified parameters are brought back into the control model to calculate. The measured value is in agreement with the theoretical value of the simulation calculation. According to the modified parameters, the prediction of the next stage construction is carried out, and compared with the measured results, the least square method is successfully applied to the construction control of the cable-stayed bridge with low tower.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27

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