支架现浇异形独塔斜拉桥施工控制技术研究

发布时间：2019-07-03 20:17

【摘要】：异形独塔斜拉桥是一种由梁、异形桥塔、斜拉索三种构件组合而成的复杂空间超静定体系。在斜拉桥的施工过程当中,程序比较复杂,影响因素众多。本文以安徽省某支架现浇异形独塔斜拉桥为研究对象,桥梁采用支架现浇施工方式,并且桥梁主塔形状奇特,这两个特点使得斜拉桥在施工上难度很大,斜拉索各施工阶段索力难以确定,受力和线性难以控制,因此斜拉索的施工控制成为本桥梁施工中至关重要的环节。首先,本文针对研究对象,进行了该桥梁的施工控制技术研究,详细地介绍了其施工的控制方法、控制内容及其注意事项,在一般桥型控制的基础上,增加了针对斜拉索、异形桥塔的控制,并对监控结果进行了温度修正,使得对研究对象的控制更加全面、准确,施工更加安全。其次,在斜拉索索力的施工控制过程中,本文在综合比对刚性支承连续梁法和弯曲应变能最小法基础上,确定了基于有约束能量法的成桥索力求解方法；采用斜拉索二次张拉的方法,以解决在斜拉索张拉过程中,由于是满堂支架现浇施工,斜拉索的张拉造成了支架的反力重分布,可能导致支架承载力不足的问题。在进行斜拉索施工过程张拉计算时,采用正装分析法,鉴于在计算过程中需要多次繁琐计算结构影响矩阵,本文采用脱架系数法,通过有支架影响矩阵和无支架影响矩阵来对系统影响矩阵进行修正,从而得出结构影响矩阵,快速求解出控制过程中施工索力,节省了时间和人力,并将此方法应用于本文的工程背景,得到了满意的效果。然后,本文针对斜拉桥在实际施工控制过程中的索力测试方法和数据处理进行了详细的介绍,同时介绍了频率法求基频过程中数据处理的频差法和新基频法,在这两种数据处理方法的基础上,本文对新基频法求基频作了修正,使得最终求得基频更接近实际,误差更小,进而求出的索力更加准确。最后,本文针对研究对象,对桥梁模型中设计参数从理论上进行了对比分析,分别详细分析了桥梁结构自重(施工临时荷载)、桥梁整体刚度、混凝土收缩徐变、整体温度等因素对异形独塔斜拉桥成桥状态的影响,进而在施工控制过程中修正主要设计参数偏差,忽略次要设计参数偏差,对斜拉桥进行更准确的施工控制。
[Abstract]:The special-shaped single-tower cable-stayed bridge is a complex spatial statically inconstant system, which is composed of beams, special-shaped towers and cable-stayed cables. In the construction process of cable-stayed bridge, the program is more complex, and there are many influencing factors. In this paper, the cast-in-place special-shaped single-tower cable-stayed bridge with support in Anhui Province is taken as the research object, and the cast-in-place construction mode of the support is adopted, and the shape of the main tower of the bridge is strange. These two characteristics make the cable-stayed bridge difficult to determine the cable force in each construction stage, and the force and linearity are difficult to control. Therefore, the construction control of the cable-stayed cable has become an important link in the construction of the bridge. First of all, aiming at the research object, this paper studies the construction control technology of the bridge, and introduces in detail the construction control method, control contents and matters needing attention. On the basis of the general bridge type control, the control for cable-stayed cable and special-shaped bridge tower is added, and the temperature correction of the monitoring results is carried out, which makes the control of the research object more comprehensive, accurate and safe. Secondly, in the construction control process of cable force, based on the comprehensive comparison of rigid supported continuous beam method and bending strain energy minimum method, the cable force solution method based on constrained energy method is determined in this paper. The method of secondary tension of cable-stayed cable is adopted to solve the problem that the tension of cable-stayed cable results in the redistribution of reaction force of the support due to the cast-in-place construction of full-hall support in the process of cable-stayed cable tension, which may lead to the insufficient bearing capacity of the support. In the tension calculation of cable-stayed cable construction process, the formal analysis method is adopted. In view of the need for many tedious calculation of structural influence matrix in the calculation process, this paper adopts the off-shelf coefficient method to modify the system influence matrix through the influence matrix with support and the influence matrix without support, so as to obtain the structural influence matrix, quickly solve the construction cable force in the control process, and save time and manpower. The method is applied to the engineering background of this paper, and satisfactory results are obtained. Then, this paper introduces in detail the cable force test method and data processing in the actual construction control process of cable-stayed bridge, and introduces the frequency difference method and the new fundamental frequency method in the process of calculating the fundamental frequency by frequency method. On the basis of these two data processing methods, this paper modifies the new fundamental frequency method to find the fundamental frequency, so that the fundamental frequency is closer to the actual situation, the error is smaller, and then the cable force is more accurate. Finally, aiming at the research object, the design parameters in the bridge model are compared and analyzed theoretically, and the effects of bridge structure weight (temporary construction load), bridge overall stiffness, concrete shrinkage and creep, overall temperature on the completion state of the special-shaped single-tower cable-stayed bridge are analyzed in detail, and then the deviation of the main design parameters is corrected and the secondary design parameter deviation is ignored in the construction control process. More accurate construction control of cable-stayed bridge is carried out.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.27

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