单索面连续刚构拱组合体系受力性能研究

发布时间：2018-02-05 02:31

本文关键词： 单索面连续刚构拱组合体系合理拱轴线受力关键因素　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：重庆合川区涪江四桥设计为(84+160+84)m单索面连续刚构拱组合体系桥梁,本文对其受力性能进行研究,完成的主要工作如下：1、对拱肋刚度设计值、拱肋合理拱轴线、副拱参与主拱受力情况以及截面形式等方面对结构受力的关键因素进行系统地研究。结果表明：本桥的合理拱轴线形式为二次抛物线；考虑副拱作用后主拱刚度增加24.5%,因此设计过程中不容忽视副拱的作用,尤其是副拱主要起景观效果的桥梁；副拱连接杆件的刚度对拱肋稳定性影响较大,其刚度过小会引起拱肋局部失衡。2、对主梁及主拱的受力情况进行详细分析,结果表明：主梁及主拱均满足受力要求：在二期恒载及活载作用下,主拱参与结构受力比较大,而在一期恒载作用下主拱参与结构受力比较小。本文的研究成果已成功应用于涪江四桥,对类似桥梁也有一定的参考价值。
[Abstract]:The fourth Fujiang Bridge in Hechuan District of Chongqing is designed as a continuous rigid frame arch composite bridge with a single cable plane of 84,160,84m. In this paper, the mechanical properties of the bridge are studied. The main work accomplished is as follows: 1. Design value of arch rib stiffness, arch rib reasonable arch axis. The key factors of the structure stress are systematically studied in the aspects of the auxiliary arch participating in the main arch force and the section form. The results show that the reasonable arch axis of the bridge is a quadratic parabola; Considering the effect of auxiliary arch, the stiffness of main arch is increased by 24.5. so the function of auxiliary arch, especially the bridge with main landscape effect, can not be ignored in the design process. The stiffness of auxiliary arch connecting member has a great influence on the stability of arch rib, and the local imbalance of arch rib will be caused by the stiffness of the arch rib. The stress of the main beam and the main arch is analyzed in detail. The results show that the main beam and arch can meet the stress requirements: under the action of the second stage dead load and live load, the main arch takes part in the large force of the structure. However, under the first stage of dead load, the main arch takes part in less stress. The research results of this paper have been successfully applied to the fourth Fujiang Bridge, which has certain reference value for similar bridges.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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