大跨度外倾式不对称曲线拱桥力学特性仿真研究

发布时间：2018-05-28 01:32

  本文选题：异型拱桥 + 静力分析　； 参考：《西南交通大学》2014年硕士论文

【摘要】：随着国民经济建设的快速发展,人们不仅对桥梁建筑的功能提出了更高的要求,也对桥梁建筑的美学提出了更高的要求。由于设计师对桥梁美学的追求,使得桥梁建筑日益的标新立异。拱桥的形式也更为丰富,一些极具个性化的异型拱桥已经逐步替代一些传统拱桥,为世界的桥梁史增添了浓墨重彩的一笔。因此,本文对异型拱桥的受力特性进行分析,进一步了解这种新颖的拱桥。本文通过对跨径达到150米的外倾式非对称曲线拱桥——府河桥分析,总结府河桥的静力特性、动力特性和稳定性。对同类型其他桥梁的设计有一定的参考依据。首先,本文介绍了拱桥的国内外的发展情况,阐述论文的研究背景和主要研究工作。通过midas civil2012建立全桥有限元模型,进行仿真分析。运用该模型,计算分析钢拱肋、主梁、吊杆等主要构件在恒载、汽车荷载、人群荷载、体系温度荷载和阵风荷载分别作用和组合作用于桥梁下的内力、应力和变形。通过在恒载和活载工况作用下的主梁跨中局部应力简要讨论了箱梁的剪力滞,引申到计算桥梁有效宽度。对桥梁自振特性进行分析,应用反应谱方法分析得到桥梁主要构件在纵向、横向和竖向地震作用下的应力和变形。研究学习稳定理论,深入了解大跨度拱桥的平面屈曲以及侧倾失稳,计算无吊杆裸拱状态下桥梁的稳定性和成桥状态下桥梁的稳定性,对比吊杆对桥梁稳定性的影响。
[Abstract]:With the rapid development of the national economy, people not only put forward higher requirements to the function of bridge building, but also to the aesthetics of bridge building. Due to the designer's pursuit of bridge aesthetics, bridge architecture is increasingly innovative. The form of arch bridge is also more abundant. Some special arch bridges have gradually replaced some traditional arch bridges, which has added a heavy color to the history of bridges in the world. Therefore, this paper analyzes the mechanical characteristics of the special-shaped arch bridge, and further understand the novel arch bridge. In this paper, the static characteristics, dynamic characteristics and stability of Fuhe Bridge are summarized through the analysis of an extroverted asymmetrical curved arch bridge with a span of 150 meters. It has certain reference basis for the design of other bridges of the same type. First, this paper introduces the development of arch bridge at home and abroad, describes the research background and main research work. The finite element model of the whole bridge is established by midas civil2012, and the simulation is carried out. Using this model, the internal forces, stresses and deformation of steel arch ribs, main beams, suspenders and other main members under dead load, automobile load, crowd load, system temperature load and array wind load are calculated and analyzed respectively. The shear lag of the box girder is briefly discussed through the local stress in the span of the main girder under dead and live load conditions, which extends to the calculation of the effective width of the bridge. The natural vibration characteristics of the bridge are analyzed, and the stress and deformation of the main components of the bridge under longitudinal, transverse and vertical earthquakes are obtained by using the response spectrum method. The stability theory is studied and the plane buckling and roll instability of the long-span arch bridge are deeply understood. The stability of the bridge under the condition of bare arch without suspenders and the stability of the bridge under the condition of bridge completion are calculated. The effects of the suspenders on the stability of the bridge are compared.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.22
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本文编号：1944690