矮塔斜拉桥结构参数敏感性分析

发布时间：2018-10-08 21:02

【摘要】：随着桥梁技术的不断发展,新的桥梁结构形式不断出现。其中,矮塔斜拉桥是受力介于连续梁桥与斜拉桥之间的一种新型桥梁结构。由于其塔较矮、梁较刚、无索区较长,具有性能优越、造型美观、经济指标良好等优点,在我国有较快的发展,在世界各国得到了广泛的应用。针对国内外矮塔斜拉桥的现状,以斜拉桥结构设计理论为基础,对影响矮塔斜拉桥结构受力特点的结构参数进行了详细地分析。首先,以常山大桥为背景,采用桥梁有限元分析软件Midas/Civil,建立桥梁空间有限元模型,通过桥梁施工阶段的模拟,对矮塔斜拉桥合理成桥的基本状态进行受力分析,并在此基础上,分析得到塔高及跨径对结构受力的敏感程度。然后,结合有限元的计算进行矮塔斜拉桥结构参数敏感性分析,重点分析结构参数的变化对索塔塔顶偏位、主梁线形、内力和斜拉索索力的影响,并对矮塔斜拉桥结构参数的选取进行了探讨。根据各参数对结构状态影响的敏感程度,将结构参数划分为主要结构参数和次要结构参数。最后,基于主要结构参数的识别理论,应用最小二乘法对常山大桥主要结构参数进行误差识别,将识别后的参数重新带入控制模型进行计算,使实测值和模拟计算理论值相吻合。根据修正后的参数进行下阶段施工的预测,并和实测结果进行了比较分析,从而成功地将最小二乘法应用于矮塔斜拉桥施工控制中。
[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.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27

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