混凝土薄壁箱梁空间扭转及横向稳定分析
发布时间：2018-12-14 12:38
【摘要】：混凝土连续箱梁桥具有桥面接缝少、刚度大、整体性强、外形美观、便于养护等优点，广泛应用于大跨径桥梁、平面弯桥和交通拥挤地区的窄桥，在城市交通和高铁建设中亦大量使用。随着交通量的不断加大，混凝土薄壁箱梁结构的扭转问题和力学稳定问题也越来越受到科研工作者和设计者的重视。 本文研究了混凝土薄壁箱梁空间的扭转问题和横向稳定问题。从最基本的自由扭转理论开始，系统地阐述薄壁箱梁的扭转理论。着重分析箱梁扭转分析中重要的组成部分 畸变效应，利用多种分析理论方法来分析实例并对结果进行对比，加深对理论的认识。利用ANSYS软件SHELL63单元模拟真实的桥梁，模拟多跨箱梁桥在受到多种偏心荷载工况下桥梁受到约束扭转产生的应力应变和畸变效应;在三维空间对箱梁桥的扭转和畸变进行分析，讨论影响桥梁扭转畸变效应的因素，得出了畸变效应与箱梁约束、箱梁截面关键点、箱梁尺寸之间的关系，横隔板对箱梁畸变的控制等结论。 此外，本文结合扭转理论分析方法，对多跨连续独墩箱梁桥这一桥型的横向稳定进行分析。对影响箱梁桥稳定性的因素及程度进行总结，得出结论：当超载倍数达2倍以上时，桥梁稳定安全系数沿曲线下降，变化较快。并对此类桥型在如何防止出现安全稳定事故尤其是整体倾覆事故提出一些改进的建议。 文章的主要创新点： 1.详述解决箱梁扭转和畸变问题的不同理论和方法，通过分析对比对不同方法的适用性和适用范围提出建议，具有实际意义。 2.利用SHELL63单元进行空间全桥结构有限元分析，，效果显著。有限元得出的数据与经典理论得出的数据做对比，最终得出结论和规律。 3.从“空间”、“整体”角度分析独墩式多跨连续箱梁桥的稳定性，分析影响稳定性的因素和程度，对此类桥梁横向稳定提出改进建议。
[Abstract]:The concrete continuous box girder bridge has the advantages of less joints, large stiffness, strong integrity, beautiful appearance and convenient maintenance. It is widely used in long span bridges, plane curved bridges and narrow bridges in congested areas. It is also widely used in urban transportation and high-speed railway construction. With the increasing traffic volume, the torsion and mechanical stability of concrete thin-walled box girder structures are paid more and more attention by researchers and designers. In this paper, the problem of torsion and lateral stability of concrete thin-walled box girder space is studied. From the basic theory of free torsion, the torsion theory of thin-walled box girder is systematically expounded. The distortion effect, which is an important part of box girder torsion analysis, is analyzed in detail. Several analytical methods are used to analyze the examples and the results are compared to deepen the understanding of the theory. The ANSYS software SHELL63 element is used to simulate the real bridge, and the stress-strain and distortion effect of multi-span box girder bridge under various eccentric load and torsion is simulated. The torsion and distortion of box girder bridge are analyzed in three dimensional space, and the factors influencing the torsional distortion effect of bridge are discussed. The relationship between distortion effect and box girder constraint, key points of box girder section and box girder size is obtained. The control of the box girder distortion by the transverse diaphragm and so on. In addition, the lateral stability of multi-span continuous box girder bridge with single pier is analyzed by using torsional theory. The factors affecting the stability of box-girder bridge are summarized and the conclusion is drawn: when the overload ratio is more than 2 times, the safety factor of bridge stability decreases along the curve and changes rapidly. Some suggestions on how to prevent the occurrence of safety and stability accidents, especially the overall overturning accidents, are put forward. The main innovation points of this paper are as follows: 1. Different theories and methods to solve the problem of torsion and distortion of box girder are described in detail. It is of practical significance to put forward suggestions on the applicability and scope of application of different methods through analysis and comparison. 2. The finite element analysis of spatial full bridge structure with SHELL63 element is effective. The data obtained by finite element method are compared with those obtained by classical theory, and the conclusion and law are obtained. 3. This paper analyzes the stability of single-pier multi-span continuous box girder bridge from the angle of "space" and "whole", analyzes the factors and degree of influencing the stability, and puts forward some suggestions for improving the lateral stability of this kind of bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213;U441
本文编号：2378626
[Abstract]:The concrete continuous box girder bridge has the advantages of less joints, large stiffness, strong integrity, beautiful appearance and convenient maintenance. It is widely used in long span bridges, plane curved bridges and narrow bridges in congested areas. It is also widely used in urban transportation and high-speed railway construction. With the increasing traffic volume, the torsion and mechanical stability of concrete thin-walled box girder structures are paid more and more attention by researchers and designers. In this paper, the problem of torsion and lateral stability of concrete thin-walled box girder space is studied. From the basic theory of free torsion, the torsion theory of thin-walled box girder is systematically expounded. The distortion effect, which is an important part of box girder torsion analysis, is analyzed in detail. Several analytical methods are used to analyze the examples and the results are compared to deepen the understanding of the theory. The ANSYS software SHELL63 element is used to simulate the real bridge, and the stress-strain and distortion effect of multi-span box girder bridge under various eccentric load and torsion is simulated. The torsion and distortion of box girder bridge are analyzed in three dimensional space, and the factors influencing the torsional distortion effect of bridge are discussed. The relationship between distortion effect and box girder constraint, key points of box girder section and box girder size is obtained. The control of the box girder distortion by the transverse diaphragm and so on. In addition, the lateral stability of multi-span continuous box girder bridge with single pier is analyzed by using torsional theory. The factors affecting the stability of box-girder bridge are summarized and the conclusion is drawn: when the overload ratio is more than 2 times, the safety factor of bridge stability decreases along the curve and changes rapidly. Some suggestions on how to prevent the occurrence of safety and stability accidents, especially the overall overturning accidents, are put forward. The main innovation points of this paper are as follows: 1. Different theories and methods to solve the problem of torsion and distortion of box girder are described in detail. It is of practical significance to put forward suggestions on the applicability and scope of application of different methods through analysis and comparison. 2. The finite element analysis of spatial full bridge structure with SHELL63 element is effective. The data obtained by finite element method are compared with those obtained by classical theory, and the conclusion and law are obtained. 3. This paper analyzes the stability of single-pier multi-span continuous box girder bridge from the angle of "space" and "whole", analyzes the factors and degree of influencing the stability, and puts forward some suggestions for improving the lateral stability of this kind of bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213;U441
【参考文献】
相关期刊论文 前10条
1 胡肇滋;单室箱梁桥畸变的两种弹性地基梁法的研究[J];东北林业大学学报;1987年01期
2 罗旗帜,吴幼明;薄壁箱梁剪力滞理论的评述和展望[J];佛山科学技术学院学报(自然科学版);2001年03期
3 王宜均;;单室梯形箱梁畸变计算[J];公路;1983年07期
4 平岛政治 ,臼木恒雄 ,廖庚甫,王用中;考虑剪切变形的任意四边形截面箱形梁畸变理论[J];国外桥梁;1980年01期
5 李盼到;张京;王美;;独柱支承梁式桥倾覆稳定性验算方法研究[J];世界桥梁;2012年06期
6 周履;单室矩形箱梁畸变计算[J];桥梁建设;1980年04期
7 强士中,李乔;关于闭口薄壁杆件约束扭转的周边不变形理论[J];桥梁建设;1985年01期
8 秦顺全;分析箱梁扭转的矩阵位移法[J];桥梁建设;1990年01期
9 何福保,郭乙木;开口和闭口薄壁杆件基本微分方程的统一和它的有限元分析[J];上海力学;1986年04期
10 曾庆元;薄壁箱形梁计算的板梁框架法[J];铁道学报;1981年02期
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