清涧河河谷区桥梁下部结构设计分析研究

发布时间：2018-12-09 17:28

【摘要】：延安至延水关高速公路清涧河河谷区路段共设主线桥梁27处、桥长8719米,乾坤湾立交E匝道桥梁4处。选择合理的桥型方案、桥墩形式尺寸以及基础形式对于确保桥梁安全、同时使桥梁造价控制在合理范围内显得至关重要。本文通过收集、查阅清涧河沿线水文站的观测资料,分析历史洪水资料,依据数理统计法和流域面积比拟法,确定了清涧河的设计流量。依据《公路桥位勘测设计规范》,确定了反应各种因素对水流阻力影响的指标-糙率n。分析清涧河水文资料,得到各水文断面分析成果,研究断面垂线流速分布,综合确定了流水压力合力的着力点,从而计算出单排桩柱式桥墩、多排桩柱式桥墩墩顶的抗推刚度和抗弯刚度,以及墩顶作用水平力、弯矩时的墩顶变位和流水压力作用时的墩顶变位。接着分析了河流对结构的作用,包括静水压力、流水压力、浮托力,明确了清涧河段桥梁作用于桥墩之设计作用组合,对半幅双柱墩、半幅独柱墩、全幅双柱墩进行了顺桥向验算、横桥向验算,确定了墩柱尺寸、配筋率,明确了各种桥墩、基础形式的适用范围。为了全面分析清涧河水流对桥梁下部结构形式设计的影响,本文就设计流量、糙率n的确定,水流对桥梁下部结构及基础受力计算进行了系统研究,建立了黄河沟壑区水中桥梁下部结构及基础设计的一般体系,并提出了相应的技术要求,研究成果不仅为这项新技术在陕西省的推广应用提供技术保障,而且也为我国桥梁设计规范的修订完善积累数据。
[Abstract]:There are 27 main bridges in Qingjian River Valley area of Yanan to Yanshuiguan Expressway, 8719 meters long bridge, 4 bridges in E ramp of Qiankun Bay Interchange. It is very important to choose a reasonable bridge scheme, the size of piers and the foundation form to ensure the safety of the bridge and to control the cost of the bridge within a reasonable range. Through collecting, consulting the observation data of hydrologic station along Qingjian River, analyzing the historical flood data, according to the mathematical statistics method and the basin area analogy method, the design discharge of Qingjian River is determined. According to the Specification for Highway and Bridge position Survey and Design, the roughness n., which is the index of the influence of various factors on the flow resistance, is determined. By analyzing the data of Qingjian river, the results of hydrological section analysis are obtained, the velocity distribution of vertical line of section is studied, and the point of stress of the pressure force of flowing water is determined synthetically, so as to calculate the pier of single row pile column type bridge. The pushing stiffness and bending stiffness of the piers with multi-column piles, the horizontal force acting on the pier top, the displacement of the pier top when bending moment and the displacement of the pier top under the pressure of flowing water are also discussed. Then it analyzes the effect of river on structure, including hydrostatic pressure, flowing water pressure, floating support force, and clarifies the design function combination of bridge action on bridge pier in Qingjian River reach, half double column pier, half single column pier, The full-width double-column piers are checked along the direction of the bridge and the direction of the transverse bridge. The size of the pier column the ratio of reinforcement and the applicable range of various piers and foundation forms are determined. In order to comprehensively analyze the influence of Qingjian river flow on the design of bridge substructure, this paper studies systematically the determination of design flow, roughness n, and the calculation of the force acting on the bridge understructure and foundation by water flow. The general system of the substructure and foundation design of the bridge in the Yellow River gully region is established, and the corresponding technical requirements are put forward. The research results not only provide a technical guarantee for the popularization and application of the new technology in Shaanxi Province, but also provide a technical guarantee for the application of the new technology in Shaanxi Province. It also accumulates data for the revision and perfection of bridge design code in China.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.5

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