双塔独柱斜拉桥几何非线性分析及分离式钢箱梁相对变形研究

发布时间：2018-11-11 10:07

【摘要】：斜拉桥是一种由主梁、主塔和斜拉索构成的高次超静定的柔性结构。在静力作用下,斜拉桥结构是否会表现出明显的几何非线性特征?在斜拉桥的钢箱梁悬臂拼装时,吊机作用梁段和吊装梁段之间是否会产生较大的相对变形?这些都是本文研究的问题。本文以南宁市五象大桥为工程背景,该桥为双塔独柱式分离式钢箱梁斜拉桥。其独特之处在于其双索面的斜拉索锚固在分离式钢箱梁内腹板上,且其横向间距仅为6m。这些既有的特点,体现了这种近似单索面斜拉索形式的斜拉桥的研究价值。本文的主要研究内容如下:(1)在斜拉桥施工过程中结构的刚度较小,几何非线性对结构有一定的影响。基于对斜拉桥几何非线性的研究,详细阐述了影响斜拉桥几何非线性的三种因素:斜拉索垂度效应、梁柱效应、大位移效应,并介绍其在有限元软件中的模拟方法。(2)使用Midas/Civil建立五象大桥的线性计算有限元模型;并在此模型基础上分别建立了考虑斜拉索垂度效应、考虑大位移效应和考虑完全非线性的有限元计算模型;研究了各种几何非线性因素对斜拉桥各个施工阶段的影响,并对比分析了各几何非线性效应影响的变化规律,最后得出了有益于以后设计和施工监控的结论。(3)首先,使用大型通用有限元软件ANSYS 14.5建立五象大桥分离式钢箱梁的板壳单元模型;其次,通过分析斜拉桥悬臂拼装阶段钢箱梁拼装端口的相对变形,提出了适用于该类型斜拉桥钢箱梁的制作和拼装的建议;再次,通过对比分析不同纵隔板类型对钢箱梁拼装端口的相对变形的影响,提出了适用于该类型斜拉桥钢箱梁的纵隔板类型选择的建议;最后,通过分析桥面吊机纵向和横向站位对钢箱梁拼装端口的相对变形的影响,提出了适用于该类型斜拉桥的桥面吊机站位的建议。
[Abstract]:Cable-stayed bridge is a kind of high order statically indeterminate flexible structure composed of main beam, main tower and stay cable. Under the static force, will the cable-stayed bridge structure show obvious geometric nonlinear characteristics? When the steel box girder cantilever of cable-stayed bridge is assembled, will there be large relative deformation between the crane acting beam section and the lifting beam section? These are the problems studied in this paper. This paper takes Wuxiang Bridge of Nanning City as the engineering background, this bridge is double tower and single column separated steel box girder cable-stayed bridge. Its unique feature is that the cable-stayed cables of the double cable plane are anchored on the internal web of the separated steel box girder, and the transverse spacing is only 6 m. These existing characteristics reflect the research value of this kind of cable-stayed bridge, which is similar to single cable plane cable-stayed bridge. The main contents of this paper are as follows: (1) in the construction of cable-stayed bridge, the stiffness of the structure is small, and geometric nonlinearity has a certain influence on the structure. Based on the study of geometric nonlinearity of cable-stayed bridges, three factors affecting geometric nonlinearity of cable-stayed bridges are described in detail: cable sag effect, Liang Zhu effect and large displacement effect. The simulation method in finite element software is introduced. (2) the linear finite element model of Wuxiang Bridge is established by using Midas/Civil; On the basis of the model, the finite element model considering the cable sag effect, the large displacement effect and the complete nonlinearity is established. The influence of various geometric nonlinear factors on the construction stage of cable-stayed bridge is studied, and the variation law of each geometric nonlinear effect is compared and analyzed. Finally, the conclusion is drawn that it is beneficial to the design and construction monitoring in the future. (3) first of all, The plate-shell element model of the separated steel box girder of Wuxiang Bridge is established by using the large-scale general finite element software ANSYS 14.5. Secondly, by analyzing the relative deformation of the steel box girder assembly ports in the cantilever assembly stage of the cable-stayed bridge, the suggestions for making and assembling the steel box girder of the cable-stayed bridge are put forward. Thirdly, by comparing and analyzing the influence of different types of mediastinal plates on the relative deformation of steel box girder assembly ports, some suggestions for selecting the type of steel box girder for this type of cable-stayed bridge are put forward. Finally, based on the analysis of the influence of the longitudinal and lateral stations of the deck crane on the relative deformation of the steel box girder assembly ports, the suggestion of the station position of the bridge deck crane suitable for this type of cable-stayed bridge is put forward.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

【相似文献】