曲线梁桥的横向“爬移”分析

发布时间：2018-03-29 18:08

本文选题：曲线梁桥　切入点：横向爬移　出处：《郑州大学》2015年硕士论文

【摘要】：曲线梁桥凭借其占地面积小、外观优美、线形灵活布置等优点在现代交通应用中占据重要位置,特别是在立交桥中应用较多。但随着曲线梁桥的增多,曲线梁桥的病害也逐渐凸显,特别是曲线梁桥的横向“爬移”时有发生,给交通带来了安全隐患。本文以某互通式立交匝道桥为实例,建立其有限元计算模型,分析曲线梁桥发生横向偏移的原因,提出相应的病害处治措施。本文完成的主要研究内容:1.依托实桥,分别采用Midas/Civil有限元软件建立梁单元模型和Ansys有限元软件建立实体单元模型,通过对比两个模型在自重作用下的竖向挠度以及在预应力荷载和自重共同作用下的横向位移、径向位移,论证了使用Ansys有限元软件建立模型的可靠性。2.以某互通式立交匝道桥为研究对象,分析了曲线梁桥在内、外在因素影响下的横向偏位效应,其中内在因素包括曲率半径、支承形式、墩柱高度等,外在因素包括自重、预应力荷载、汽车荷载、温度、混凝土收缩徐变等。通过对比分析各因素的影响效应,得出曲率半径是引起该曲线梁桥横向“爬移”的主要内在因素,温度效应是影响该曲线梁桥发生横向“爬移”的主要外在因素,为该曲线梁桥的横向“爬移”处治措施提供依据。3.综述了曲线梁桥发生横向偏位的预防措施和处治措施,并结合本文依托工程实例的实际桥梁病害,提出了该曲线梁桥发生病害后的加固改造措施。
[Abstract]:Curved girder bridge occupies an important position in modern traffic application with its advantages of small area, beautiful appearance and flexible arrangement of line shape, especially in overpass bridge. But with the increase of curved girder bridge, The disease of curved girder bridge is becoming more and more prominent, especially the lateral "climb and move" of curved girder bridge occurs from time to time, which brings safety trouble to traffic. In this paper, taking an interchange ramp bridge as an example, the finite element calculation model is established. This paper analyzes the reason of lateral deviation of curved girder bridge, and puts forward the corresponding measures to deal with the disease. The main research content of this paper is: 1. The beam element model is established by Midas/Civil finite element software and the solid element model is established by Ansys finite element software. By comparing the vertical deflection of the two models under the action of self-gravity and the lateral displacement under the joint action of prestressed load and deadweight, the model is established. Radial displacement, the reliability of establishing model with Ansys finite element software is demonstrated. Taking an interchange ramp bridge as an object of study, the lateral deflection effect of curved girder bridge is analyzed under the influence of external factors. The internal factors include radius of curvature, form of support, height of pier and so on. External factors include weight, prestressed load, vehicle load, temperature, shrinkage and creep of concrete, etc. It is concluded that the radius of curvature is the main internal factor that causes the lateral "climbing" of the curved girder bridge, and the temperature effect is the main external factor that affects the lateral "climb" of the curved girder bridge. This paper provides the basis for the lateral "climbing and moving" treatment measures of the curved girder bridge. The preventive measures and the treatment measures for the lateral deviation of the curved girder bridge are summarized, and the actual bridge diseases based on the engineering examples in this paper are discussed. The reinforcement and reconstruction measures of the curved girder bridge after the disease occurred are put forward.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.42

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