温岭市跃进桥方案设计与结构优化分析研究

发布时间：2018-01-05 05:26

本文关键词：温岭市跃进桥方案设计与结构优化分析研究　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济发展,交通压力增大,为了满足交通需要,城市道路路幅越来越宽,宽跨比也越来越大,部分桥梁宽跨比甚至超过1。与此同时,大众对作为公共建筑物的桥梁的美学提出越来越高的要求,拱桥由于其造型多变,具有独特的美学价值及相比斜拉桥、悬索桥等景观桥而言较为经济,在方案设计中常常被选中。本文以跃进桥改建工程作为研究背景进行了方案设计,然后重点对实施方案,即钢管混凝土拱桥进行优化设计分析。在优化设计分析中通过Midas Civil 2013软件对此拱桥建立了仅含上部结构的有限元模型和包含下部结构的整体有限元模型,比较了两种建模方法的优缺点,对两种模型的计算进行了比较分析,对包含下部结构的整体有限元模型讨论了m值选取对其计算结果的影响;分析比较了按照不同国家规范的考虑剪力滞效应翼缘有效宽度计算；然后,在含下部结构的整体模型的基础上分别构建了多个静力计算模型,分析了钢箱梁刚度、钢管壁厚、吊杆初张力、次拱初张力对桥梁关键构件的内力和变形的影响；最后,通过改变钢管壁厚、拱肋倾角等因素对拱的稳定系数及全桥动力特性进行了分析比较。研究结果表明,在初步设计阶段为节约机时可采用仅含上部结构的有限元分析模型,而在施工图设计阶段宜采用含下部结构的整体有限元分析模型进行各项计算和验算；比较欧洲规范与中国规范(征求意见稿)所计算出的跃进桥钢箱梁的翼缘有效宽度,欧洲规范计算结果更偏于安全；次拱对全桥的稳定有很大的贡献,同时,其张拉力的大小对桩顶位移、拱脚钢管内混凝土拉应力及拱顶横桥向位移均有较大的影响,因此是全桥中关键构件,应留有足够的安全度；另外,就次拱初张力取值提出了建议；吊杆、钢箱梁的刚度、钢管壁厚都在不同程度上影响全桥的内力和位移。钢管壁厚、拱肋倾角极大地影响全桥的稳定性和动力特性。本文基于既有有限元软件对这类大宽跨比钢管混凝土拱桥进行了静、动力分析,其研究成果为后续的施工图设计或修改提供了改进依据,同时也对类似桥梁的设计具有一定的工程参考价值。
[Abstract]:With the development of economy, traffic pressure is increasing. In order to meet the traffic needs, the road width and the ratio of width to span of urban roads are becoming wider and wider, and the ratio of width to span of some bridges even exceeds 1. At the same time. The public put forward higher and higher requirements for the aesthetics of bridges as public buildings. Because of its changeable shape, arch bridges have unique aesthetic value and are more economical than cable-stayed bridges, suspension bridges and other landscape bridges. In the project design is often selected. This paper takes the leaping bridge reconstruction project as the research background, and then focuses on the implementation of the scheme. That is, the concrete filled steel tube arch bridge is optimized and analyzed. In the process of optimization design analysis, Midas Civil is adopted. The finite element model of the arch bridge including only the superstructure and the whole finite element model including the substructure are established by the software of 2013. The advantages and disadvantages of the two modeling methods are compared and the calculation of the two models is compared and analyzed. The influence of the selection of m value on the calculation results is discussed for the whole finite element model including the substructure. The effective width calculation of flange considering shear lag effect according to different national codes is analyzed and compared. Then, on the basis of the whole model with substructure, several static calculation models are constructed, and the stiffness of steel box girder, the wall thickness of steel pipe and the initial tension of suspender are analyzed. The influence of the initial tension of the secondary arch on the internal force and deformation of the key components of the bridge; Finally, the stability coefficient of arch and the dynamic characteristics of the whole bridge are analyzed and compared by changing the thickness of the steel pipe wall and the inclination of the arch rib. The results show that the stability coefficient of the arch and the dynamic characteristics of the whole bridge are analyzed and compared. The finite element analysis model with superstructure only can be used in the preliminary design stage, but the whole finite element analysis model with substructure should be used to calculate and check calculation in the construction drawing design stage. Compared with the effective flange width of the steel box girder of the leapfrog bridge calculated by the European Code and the Chinese Code (draft for comments), the calculation results of the European Code are more safety. The secondary arch has a great contribution to the stability of the whole bridge. At the same time, the magnitude of the tension force has a great influence on the displacement of the pile top, the concrete tensile stress in the steel tube with arch foot and the displacement of the transverse bridge with the arch top, so it is a key component in the whole bridge. Adequate safety should be left; In addition, some suggestions are put forward to determine the initial tension of the secondary arch. The stiffness of suspenders and steel box girders and the wall thickness of steel pipe all affect the internal force and displacement of the whole bridge to some extent. The slope angle of arch rib greatly affects the stability and dynamic characteristics of the whole bridge. Based on the existing finite element software, the static and dynamic analysis of this kind of concrete filled steel tube arch bridge with large width span ratio is carried out in this paper. The research results provide an improved basis for the subsequent design or modification of construction drawings, and also have a certain engineering reference value for the design of similar bridges.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.5

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