大跨度公铁两用悬索桥静动力特性研究

发布时间：2018-09-17 15:20

【摘要】：悬索桥属柔性结构,一直以来困扰公铁两用悬索桥发展的是挠度问题而不是荷载问题,所以对公铁两用悬索桥刚度的讨论分析很有必要。但是目前在铁路悬索桥刚度方面仍缺乏足够的实践和研究,没有相应成熟的理论指导依据。本文针对公铁两用悬索桥刚度问题展开研究,主要完成了以下研究工作：(1)研究讨论了悬索桥静力计算和动力计算理论,为悬索桥的静动力分析提供理论基础。(2)本文以某大跨度公铁两用悬索桥为工程背景,采用有限元软件Midas Civil建立悬索桥的空间有限元计算模型。并对主缆吊索内力分布、主梁内力应力、活载作用下的竖向挠度、竖向转角及横向风荷载作用下的横向挠度、转角等静力计算结果进行了分析,并计算了全桥自振特性、在三个方向一致激励下地震时程响应等动力响应结果。(3)文章选定了支撑体系、边跨辅助桥墩布置方式、边中跨比、垂跨比、缆梁连接方式、主梁截面形式、高跨比、宽跨比和节间长度等结构参数进行分析。将结构参数分为整体结构参数和主梁形式两部分,通过改变结构参数,对比分析它们对悬索桥竖向刚度、横向刚度的敏感性,总结归纳出提高大跨度公铁两用悬索桥刚度的有效措施。(4)对比分析结构参数(支撑体系、边跨辅助桥墩布置方式、边中跨比、垂跨比、缆梁连接方式、主梁截面形式、高跨比、宽跨比和节间长度)对悬索桥自振特性和地震时程响应的影响规律,从而归纳总结出具有良好动力性能的结构参数选取原则。通过对大跨度公铁两用悬索桥关键设计参数的分析,桥梁刚度及动力响应的结论可供同类型桥梁设计参考。
[Abstract]:Suspension bridge is a flexible structure, which has been bothering the development of highway and rail suspension bridge is deflection problem rather than load problem, so it is necessary to discuss and analyze the stiffness of highway and rail suspension bridge. But at present, the stiffness of railway suspension bridge is still lack of enough practice and research, and there is no relevant theoretical guidance. In this paper, the stiffness of the suspension bridge is studied. The main works are as follows: (1) the static and dynamic calculation theory of the suspension bridge is discussed. It provides a theoretical basis for static and dynamic analysis of suspension bridge. (2) in this paper, the finite element software Midas Civil is used to establish the spatial finite element model of suspension bridge. The internal force distribution of the main cable sling, the internal force stress of the main girder, the vertical deflection under the action of live load, the lateral deflection under the action of vertical rotation angle and the lateral wind load are analyzed, and the natural vibration characteristics of the whole bridge are calculated. The results of seismic time-history response are consistent in three directions. (3) the supporting system, the arrangement of side span auxiliary pier, the ratio of side to middle span, the ratio of vertical span to span, the connection mode of cable beam, the form of main beam section, the ratio of height to span are selected in this paper. The structural parameters such as width-span ratio and Internode length were analyzed. The structural parameters are divided into two parts: the integral structural parameters and the main beam form. By changing the structural parameters, the sensitivity of the structural parameters to the vertical and lateral stiffness of the suspension bridge is compared and analyzed. The effective measures to improve the stiffness of the long-span suspension bridge are summarized and summarized. (4) the structural parameters (support system, side span auxiliary pier arrangement, side to middle span ratio, vertical span ratio, cable beam connection mode, main beam section form, height span ratio) are compared and analyzed. The influence of width to span ratio and Internode length on the natural vibration characteristics and seismic time history response of suspension bridge is discussed, and the selection principle of structural parameters with good dynamic performance is summarized. Through the analysis of the key design parameters of the large-span suspension bridge, the conclusion of the stiffness and dynamic response of the bridge can be used as reference for the design of the same type of bridge.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U448.25

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