开口箱—桁组合结构铁路斜拉桥桥面系结构的研究

发布时间：2018-01-10 16:44

本文关键词：开口箱—桁组合结构铁路斜拉桥桥面系结构的研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：在建荆岳铁路(荆州—岳阳)洞庭湖大桥是世界上第一座三塔双主跨铁路斜拉桥,跨度布置为(98+140+406+406+140+98)m,通行双线中-活载,主梁采用开口箱-桁组合结构,以提高桥梁的整体刚度和桥面系局部刚度。本文以该桥为背景,采用有限元分析方法,对开口箱-桁组合结构斜拉桥的桥面系结构形式和结构参数进行了研究,主要工作和成果如下： 1、提出了两种开口箱-桁组合斜拉桥的桥面结构体系,一种为密布横梁桥面结构体系,另一种为纵、横梁桥面结构体系。对两种桥面结构体系进行参数化并分别拟定了基本结构,采用空间板梁法分别建立了全桥空间有限元模型,较为系统地研究了桥梁的变形和受力状态。结果表明,两种桥面结构都可匹配出较为合理的结构参数,可应用于开口箱-桁组合结构斜拉桥的正交异性板桥面系。 2、对比研究了两种桥面结构体系对桥梁整体刚度的影响。结果表明,就桥梁整体刚度而言,密布横梁桥面系和纵、横梁桥面系两种结构基本一致,两者的基本结构在静活载作用下的挠跨比分别为1/679和1/685。 3、对比研究了两种桥面结构体系的局部刚度,包括桥面节间中心相对变形wc和同一线两轨三米内相对变形量△。结果表明,桥面系结构参数对wc和△的影响很大,密布横梁桥面系的局部刚度明显优于纵、横梁桥面系； 4、对比研究了两种桥面结构体系桥面荷载的传力途径和桥面受力状态。结果表明,密布横梁桥面系的下弦箱应较粗壮,其基本结构的结构构造和结构参数是合理的；纵、横梁桥面系的纵、横梁应在其基本结构上适当增强,而下弦箱略显粗壮,可适当减弱。本文的研究成果为洞庭湖三塔双主跨铁路斜拉桥的设计提供了依据,对其他类似桥梁也有参考价值。图36幅,表18个,参考文献60篇。
[Abstract]:Abstract: the Jingyue Railway (Jingzhou-Yueyang) Dongting Lake Bridge under construction is the first cable-stayed bridge with three towers and two main spans in the world, with a span of 98 140 406 406 140 98 m. In order to improve the overall stiffness of the bridge and the local stiffness of the deck system, the main beam adopts the open box truss composite structure to improve the overall stiffness of the bridge and the local stiffness of the bridge system. This paper takes the bridge as the background and adopts the finite element analysis method. The structure form and structural parameters of deck system of cable-stayed bridge with open box-truss composite structure are studied. The main work and results are as follows: 1. Two kinds of deck structure system of cable-stayed bridge with open box and truss are put forward, one is the bridge deck system with dense beam, the other is longitudinal. The two kinds of bridge deck structure system are parameterized and the basic structures are drawn up respectively. The spatial finite element model of the whole bridge is established by using the spatial slab beam method. The deformation and stress state of the bridge are studied systematically. The results show that the two kinds of bridge deck structure can match the reasonable structural parameters. It can be applied to orthotropic plate bridge system of cable-stayed bridge with open box and truss structure. 2. The effects of two kinds of deck structure on the overall stiffness of the bridge are compared and studied. The results show that the bridge deck system of dense cross beam is basically the same as that of longitudinal and cross beam deck system in terms of the overall stiffness of the bridge. The basic structure of the two structures under the action of static and live load is 1/679 and 1 / 685 respectively. 3. The local stiffness of two kinds of bridge deck structures, including the relative deformation of the center of the bridge deck and the relative deformation within three meters of the two rails of the same line, are compared and studied. The results show that. The structural parameters of bridge deck system have a great influence on WC and the local stiffness of bridge deck system with dense beams is obviously superior to that of longitudinal bridge deck system. 4. The load transfer way and the stress state of the deck of two kinds of bridge deck structure system are compared. The results show that the chord box of the bridge deck system with dense cross beam should be relatively strong. The structure and parameters of its basic structure are reasonable. The longitudinal and transverse beams of the bridge deck system should be strengthened in their basic structure, while the chord box is slightly thicker and can be weakened properly. The research results of this paper provide the basis for the design of the cable-stayed bridge with three towers and two main spans in Dongting Lake, and have reference value for other similar bridges, including 36 figs, 18 tables and 60 refs.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U443.32

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