异型索塔分叉处力学特性分析
发布时间：2018-08-28 08:47
【摘要】：斜拉桥索塔、主梁、拉索是该桥梁结构体系的三个基本组成部分，而索塔是其结构体系中的关键部分，其不光是要承受巨大的轴向力（主要为塔的重力及拉索索力的垂直分量），还要承受较大的弯矩作用，同时，，索塔作为斜拉桥的特有标志，其结构形式不断创新，其受力情况也日趋复杂。因此在主塔设计时不仅要满足桥梁结构的强度、刚度、稳定性，同时对主塔与梁、墩连接处以及主塔自身特殊构造处的受力情况还必须进行周到详尽的分析，以确保桥梁在施工过程中以及成桥运营后的安全。 本文以重庆东水门长江大桥为研究对象，该桥索塔为天梭型，因其在塔墩与塔柱交接处存在一个类似Y形的分叉结构，在桥梁施工及成桥运营过程中，该分叉处受力情况非常复杂，存在诸多不确定性因素，因此有必要对该分叉处进行力学特性分析，找出应力分布规律和大小。首先运用有限元软件Midas Civil建立的全桥整体空间有限元模型，对该桥施工各阶段进行分析，根据整体模型的分析结果以及桥梁施工的情况选取最不利受力工况，再采用有限元软件Midas FEA建立的分叉处局部实体单元模型，分析最不利工况下分叉处的受力特性，得出该位置位移变化情况、主拉应力、主压应力的分布状态及大小，从而对分叉处的安全性进行评估，并据此提出个人的建议。此外对下塔柱中临时拉杆初张力大小及其变化规律进行了探讨，并对其撤出对分叉处的影响进行了研究。
[Abstract]:The cable-stayed bridge cable tower, main beam and cable are the three basic components of the bridge structure system, and the cable tower is the key part of the structure system. It has to bear not only the huge axial force (mainly the gravity of the tower and the vertical component of the cable force), but also the larger bending moment. At the same time, the cable tower, as a special symbol of the cable-stayed bridge, is constantly innovating in its structural form. Its stress situation also becomes more and more complex. Therefore, in the design of the main tower, not only the strength, stiffness and stability of the bridge structure should be satisfied, but also the stress situation of the main tower and the beam, the connection of the pier and the special structure of the main tower must be analyzed in detail. To ensure the bridge in the construction process and after the operation of the bridge safety. This paper takes the Dongshuimen Yangtze River Bridge in Chongqing as the research object. The tower of the bridge is of the sky shuttle type. Because of the existence of a Y-shaped bifurcation structure at the junction between the tower pier and the tower post, the bridge is constructed and operated. It is necessary to analyze the mechanical characteristics of the bifurcation and find out the distribution law and size of the stress. Firstly, the whole space finite element model of the whole bridge is established by using the finite element software Midas Civil, and every stage of the bridge construction is analyzed. According to the analysis result of the whole model and the condition of the bridge construction, the most unfavorable load condition is selected. Then using the finite element software Midas FEA to establish the local solid element model at the fork, the mechanical characteristics of the bifurcation under the most unfavorable working conditions are analyzed, and the displacement variation, the main tensile stress, the distribution state and the magnitude of the main compressive stress are obtained. Thus the security of the branch is evaluated and personal recommendations are made accordingly. In addition, the initial tension and its variation of the temporary tension rod in the lower column are discussed, and the influence of its withdrawal on the bifurcation is studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.27
本文编号：2208891
[Abstract]:The cable-stayed bridge cable tower, main beam and cable are the three basic components of the bridge structure system, and the cable tower is the key part of the structure system. It has to bear not only the huge axial force (mainly the gravity of the tower and the vertical component of the cable force), but also the larger bending moment. At the same time, the cable tower, as a special symbol of the cable-stayed bridge, is constantly innovating in its structural form. Its stress situation also becomes more and more complex. Therefore, in the design of the main tower, not only the strength, stiffness and stability of the bridge structure should be satisfied, but also the stress situation of the main tower and the beam, the connection of the pier and the special structure of the main tower must be analyzed in detail. To ensure the bridge in the construction process and after the operation of the bridge safety. This paper takes the Dongshuimen Yangtze River Bridge in Chongqing as the research object. The tower of the bridge is of the sky shuttle type. Because of the existence of a Y-shaped bifurcation structure at the junction between the tower pier and the tower post, the bridge is constructed and operated. It is necessary to analyze the mechanical characteristics of the bifurcation and find out the distribution law and size of the stress. Firstly, the whole space finite element model of the whole bridge is established by using the finite element software Midas Civil, and every stage of the bridge construction is analyzed. According to the analysis result of the whole model and the condition of the bridge construction, the most unfavorable load condition is selected. Then using the finite element software Midas FEA to establish the local solid element model at the fork, the mechanical characteristics of the bifurcation under the most unfavorable working conditions are analyzed, and the displacement variation, the main tensile stress, the distribution state and the magnitude of the main compressive stress are obtained. Thus the security of the branch is evaluated and personal recommendations are made accordingly. In addition, the initial tension and its variation of the temporary tension rod in the lower column are discussed, and the influence of its withdrawal on the bifurcation is studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.27
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本文编号：2208891
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