斜靠式拱桥弹塑性分析
发布时间：2018-08-06 11:00
【摘要】：斜靠式拱桥由四片拱肋组成，中间两片为平行竖直拱肋，或外倾拱肋，两侧各布一倾斜拱肋，，中间平行拱肋为桥梁的主要承重结构，每侧倾斜拱肋与相邻竖直拱肋构成人行桥的空间。这种桥型新颖美观，造型独特，桥面开阔，具有明显的技术特点。但此类桥型取消了两主拱肋之间的横向支撑，受力及构造复杂，空间效应明显，确定合理的结构设计参数以确保桥梁的稳定性，是斜靠式拱桥设计的关键性问题之一。本文以广州市增城大桥为工程背景，利用通用程序ANSYS建立其空间有限元模型，进行了详细的弹塑性稳定分析计算，并对斜靠式拱桥弹塑性稳定的影响因素进行了较细致的比较分析。论文的主要工作如下： 1.对拱桥和拱桥稳定理论的发展进行了回顾和总结，并对各种分析方法进行了讨论，以及对拱桥稳定的有限元基本理论进行了阐述。 2.在增城大桥空间有限元模型的基础上，运用通用程序ANSYS对其分别进行了线弹性、几何非线性和弹塑性稳定分析，对他们的异同进行了探讨，并比较了几何非线性和材料非线性这两类非线性因素对结构内力和变形的影响。 3.通过有限元模型，分析了三种设计参数（吊杆数量和间距、横撑数量和刚度、斜拱与主拱刚度比）以及两种荷载要素（均布荷载、横向风载）对斜靠式拱桥极限承载力的影响，此外，还对斜靠式拱桥和普通拱桥的稳定性能进行了对比分析，更全面地了解了斜靠式拱桥的弹塑性稳定性能。 增城大桥是一座典型的斜靠式拱桥，本文的讨论和分析结果能为日后同类桥梁的设计建设提供一定的参考。
[Abstract]:The skew arch bridge is composed of four arch ribs, two of which are parallel vertical arch ribs, or extroverted arch ribs, each with one inclined arch rib on both sides, and the middle parallel arch rib is the main load-bearing structure of the bridge. Each side inclined arch rib and adjacent vertical arch rib constitute the space of pedestrian bridge. This kind of bridge is novel and beautiful, unique in shape, open in deck, and has obvious technical characteristics. However, this kind of bridge cancels the transverse support between two main arch ribs, the force and structure are complicated, and the space effect is obvious. It is one of the key problems in the design of skew arch bridge to determine reasonable structural design parameters to ensure the stability of the bridge. In this paper, based on the engineering background of Zengcheng Bridge in Guangzhou, the spatial finite element model of Zengcheng Bridge is established by using the general program ANSYS, and the elastic-plastic stability analysis and calculation are carried out in detail. The factors influencing the elastoplastic stability of inclined arch bridge are compared and analyzed in detail. The main work of this paper is as follows: 1. This paper reviews and summarizes the development of arch bridge and arch bridge stability theory, discusses various analysis methods, and expounds the basic finite element theory of arch bridge stability. 2. Based on the spatial finite element model of Zengcheng Bridge, the linear elasticity, geometric nonlinearity and elastoplastic stability of Zengcheng Bridge are analyzed by using the general program ANSYS, and their similarities and differences are discussed. The effects of geometric nonlinearity and material nonlinearity on the internal force and deformation of the structure are compared. Based on the finite element model, the effects of three design parameters (the number and spacing of suspenders, the number and stiffness of transverse brace, the ratio of oblique arch and main arch stiffness) and two load elements (uniform load, transverse wind load) on ultimate bearing capacity of inclined arch bridge are analyzed. In addition, the stability performance of skew arch bridge and common arch bridge are compared and analyzed, and the elastoplastic stability of inclined arch bridge is understood more comprehensively. Zengcheng Bridge is a typical inclined arch bridge. The discussion and analysis in this paper can provide some references for the design and construction of similar bridges in the future.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22
[Abstract]:The skew arch bridge is composed of four arch ribs, two of which are parallel vertical arch ribs, or extroverted arch ribs, each with one inclined arch rib on both sides, and the middle parallel arch rib is the main load-bearing structure of the bridge. Each side inclined arch rib and adjacent vertical arch rib constitute the space of pedestrian bridge. This kind of bridge is novel and beautiful, unique in shape, open in deck, and has obvious technical characteristics. However, this kind of bridge cancels the transverse support between two main arch ribs, the force and structure are complicated, and the space effect is obvious. It is one of the key problems in the design of skew arch bridge to determine reasonable structural design parameters to ensure the stability of the bridge. In this paper, based on the engineering background of Zengcheng Bridge in Guangzhou, the spatial finite element model of Zengcheng Bridge is established by using the general program ANSYS, and the elastic-plastic stability analysis and calculation are carried out in detail. The factors influencing the elastoplastic stability of inclined arch bridge are compared and analyzed in detail. The main work of this paper is as follows: 1. This paper reviews and summarizes the development of arch bridge and arch bridge stability theory, discusses various analysis methods, and expounds the basic finite element theory of arch bridge stability. 2. Based on the spatial finite element model of Zengcheng Bridge, the linear elasticity, geometric nonlinearity and elastoplastic stability of Zengcheng Bridge are analyzed by using the general program ANSYS, and their similarities and differences are discussed. The effects of geometric nonlinearity and material nonlinearity on the internal force and deformation of the structure are compared. Based on the finite element model, the effects of three design parameters (the number and spacing of suspenders, the number and stiffness of transverse brace, the ratio of oblique arch and main arch stiffness) and two load elements (uniform load, transverse wind load) on ultimate bearing capacity of inclined arch bridge are analyzed. In addition, the stability performance of skew arch bridge and common arch bridge are compared and analyzed, and the elastoplastic stability of inclined arch bridge is understood more comprehensively. Zengcheng Bridge is a typical inclined arch bridge. The discussion and analysis in this paper can provide some references for the design and construction of similar bridges in the future.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22
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