连续弯梁桥受力特性及有限元分析

发布时间：2018-11-11 20:48

【摘要】：随着国家对交通事业的投入增大,大量的匝道桥、互通立交桥和高架桥随着交通事业的飞速发展而被建设,弯梁桥因具备有弯、斜、坡、异形等特点而能灵活地适应实际线路情况,不受复杂线路结构限制,而且还具备有优美的线形外观以及节省工程占地等优点,近年来被运用的越来越广泛。弯梁桥远比正交桥梁复杂,在我国发展相对比较缓慢,随着国内工程界研究学者逐步提高了对弯梁桥的重视,已经取得了很大的成就,但目前对弯梁桥受力特性仍存在许多问题有待解决。本文以太原市环线道路—北中环至西中环立交工程第四联为背景,利用有限元分析程序,讨论了弯梁桥的受力特性及圆心角和支座布置形式对弯梁桥的受力影响,具体内容包括以下几点：1、针对3跨连续弯箱梁桥工程实例,基于梁格理论分析结构内力(包括弯矩、扭矩和剪力)、反力及变形特点,总结了连续弯箱梁桥的受力特性。2、结合工程实例,建立多个空间梁格模型,控制其他影响参数不变,取不同的圆心角0°-50°,以10°为一个差度,分析讨论了控制截面在不同荷载作用下因圆心角因素对弯矩、扭矩、剪力及反力的影响。3、结合背景工程支座布置形式,控制上部结构不变,研究不同支承形式对弯梁桥内力的影响及中墩支座的径向偏移对支反力的影响。4、根据弯梁桥的分析理论,对背景工程模型分析结果进行试验验证,并通过弯梁桥结构响应特征,对该类弯梁桥的荷载试验提供一定的建议。
[Abstract]:With the increase of national investment in transportation, a large number of ramps, interchanges and viaducts have been built with the rapid development of the transportation industry. The special-shaped can adapt to the actual line situation flexibly and not be restricted by the complex line structure. It also has the advantages of beautiful line appearance and saving the engineering space. It has been used more and more widely in recent years. Curved beam bridge is much more complex than orthogonal bridge, and its development is relatively slow in China. With the increasing attention paid by domestic engineering scholars to curved beam bridge, great achievements have been made. However, there are still many problems to be solved for the mechanical characteristics of curved girder bridge. In this paper, based on the fourth connection of Taiyuan Ring Road-North Central to West Central Interchange, using finite element analysis program, the force characteristics of curved beam bridge and the influence of center angle and bearing arrangement on the force of curved beam bridge are discussed. The concrete contents include the following: 1. Based on the theory of beam lattice, the internal force (including moment, torque and shear force), reaction force and deformation characteristics of the structure are analyzed based on the three span continuous curved box girder bridge engineering example. The mechanical characteristics of continuous curved box girder bridge are summarized. 2. Combined with engineering examples, several space girder models are established, other influence parameters are not changed, different center angle 0 掳-50 掳is taken, and 10 掳is taken as a difference. This paper analyzes and discusses the influence of the control section on bending moment, torque, shear force and reaction force due to the factors of center angle under different loads. 3. In combination with the supporting layout of the background engineering, the control superstructure remains unchanged. The influence of different supporting forms on the internal force of curved beam bridge and the influence of radial offset of middle pier support on supporting reaction force are studied. 4. According to the analysis theory of curved beam bridge, the analysis results of background engineering model are tested and verified. According to the structural response characteristics of curved beam bridge, some suggestions are provided for the load test of this kind of curved beam bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441

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