悬拼施工的叠合梁斜拉桥线形控制与分析

发布时间：2017-12-26 18:10

本文关键词：悬拼施工的叠合梁斜拉桥线形控制与分析　出处：《西南交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：大跨度叠合梁斜拉桥主梁一般采用悬臂拼装的施工方法,其成桥阶段结构的线形、内力与所采用的施工方法密切相关,必须进行严格的施工控制。悬臂拼装斜拉桥施工控制中的关键问题就是要选择合适的制造线形及安装线形,并在施工过程中调整误差,使得在最终的成桥阶段桥梁结构线形与设计成桥线形相吻合。论文以灌河大桥为工程背景,利用NLABS有限元分析软件,针对主梁制造线形的确定,以及制造误差对成桥阶段和施工阶段的影响展开研究。论文主要内容有：(1)介绍了斜拉桥控制方法、控制理念的发展过程,详细阐述了几何控制法的发展历程、基本原理和工程运用。(2)介绍了拉索、索塔、主梁等关键构件无应力状态量的求解方法,讨论了主梁安装线形、制造线形的区别与联系,对零初始位移法和切线初始位移法下,主梁安装、制造线形的计算方法做了详细的阐述。(3)基于零初始位移法,在线性和几何非线性条件下分别计算了灌河大桥主梁的安装线形、制造线形、梁段制造尺寸、梁段间的制造夹角等。(4)研究了拉索、索塔、主梁等关键构件的几种制造误差对成桥状态的影响。得出了几何控制法下,斜拉桥结构对几何参数误差敏感性较高的结论。(5)计算分析了斜拉索、主梁两个关键构件的制造误差对施工过程中主梁线形的影响,研究了不同制造误差在悬臂拼装施工阶段中的传播特性。索长、梁重和梁段间夹角误差引起的主梁线形误差随着悬臂段的伸长表现出典型的收敛特性,而梁长误差引起的线形误差则表现出典型的发散特性。
[Abstract]:The main girder of long span composite girder cable-stayed bridge is generally constructed by cantilever assembling. The linear and internal force of the structure at the completion stage is closely related to the construction method adopted, and strict construction control is necessary. The key problem in the construction control of cantilever assembled cable-stayed bridge is to choose the right manufacturing line and installation alignment, and adjust the error in the construction process, so that the final alignment stage is consistent with the designed bridge alignment. Taking the river bridge as the engineering background, the NLABS finite element analysis software is used to determine the alignment of the main girder and the influence of manufacturing errors on the completion stage and the construction stage. The main contents of the paper are as follows: (1) the development process of control method and control concept of cable-stayed bridge is introduced. The development history, basic principles and engineering application of the geometric control method are elaborated in detail. (2) introduced the key components of cable, tower and beam etc. for calculation of stress state, the relationship between beam alignment, manufacturing linear discussion of zero initial displacement method and tangent initial displacement method, detail calculation method of installation and manufacture of linear beam. (3) based on the zero initial displacement method, the installation alignment, manufacturing linetype, beam size and manufacturing angle of the main girder of the ghe River Bridge are calculated under the condition of linear and geometric nonlinearity respectively. (4) the influence of several manufacturing errors of key components such as cable, cable tower and main beam on the state of bridge formation is studied. It is concluded that the geometric control method has a high sensitivity to the geometric error sensitivity of the cable-stayed bridge. (5) the influence of the manufacturing errors of the two key components of the stay cable and main girder on the girder alignment during construction is calculated and analyzed, and the propagation characteristics of different manufacturing errors in the cantilever assembly stage are studied. The linear error of girder caused by the angle error between cable length, beam weight and beam segment shows a typical convergence character with the elongation of cantilever section, while the linear error caused by beam length error shows a typical divergence characteristic.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U448.27

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