耒阳市东洲公园人行悬索桥试验与加固设计研究

发布时间：2018-07-09 21:59

本文选题：人行悬索桥 + 有限元　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：人行悬索桥以其优美的线型、新颖的外观以及选址灵活等优点在山区和旅游景点都得到广泛的应用。但该类桥梁的刚度较小,使用中的抗风险能力偏小,为了确保其运营期间的安全性,日后维修与加固就显得尤为重要。耒阳市东洲公园人行索桥跨度111.58m,2001年建成交付使用,使用期间由于洪水浸泡锚碇加之使用荷载加大等因素影响,桥梁出现了索夹滑移、吊杆偏移、锚碇变位、刚度下降等系列病害,本文以该工程为背景,结合桥梁检测和加固维修设计开展了相关研究工作。主要内容有： 1.组织并实施该桥的检测工作,包括外观检测、病害调查、线形测量、主缆索力测量、吊杆力测量、动力特性测试等,以获取该桥的现状资料以弥补该桥竣工资料丢失的不足,为对该桥进行性能评定、开展力学分析和加固设计奠定基础。 2.利用Midas软件建立了该桥的空间有限元模型实施计算机仿真分析：由于该桥的实测主缆线形与原设计线形存在较大的区别,以实测资料为基础,以实测线形和索力为目的,通过模型试算得出与实测结构相吻合的结构计算模型,据此开展理论分析和加固设计计算。 3.针对本桥设置了抗风缆索的特点,采用有限元法分析了风缆的作用效应及其对对全桥刚度的贡献,进而论证了该桥加强风缆的必要性。 4.原结构设计的索夹在使用中出现了索夹滑移,导致吊杆形成偏移现象,结合加固设计拟提高结构桥面刚度的技术思路,对索夹结构、吊杆面积、换索方法和工艺等进行研究,提出了一套新型人行索桥索夹结构。 5.对水浸泡条件下的主缆锚锭进行基础受力分析与变位分析,从理论上研究该条件下对锚锭的影响,并提出了具体的加固措施。 6.基于以上理论分析,提出了该桥加固设计的全套技术措施,加固后的效果良好。图105幅,表39个,参考文献50篇
[Abstract]:Abstract: pedestrian suspension bridge has been widely used in mountainous areas and tourist attractions for its beautiful line shape, novel appearance and flexible location. However, the stiffness of this kind of bridge is small, and the ability to resist risks in use is small. In order to ensure the safety of the bridge during operation, it is particularly important to maintain and strengthen the bridge in the future. The span of the pedestrian cable bridge in Tongzhou Park, Leiyang City, was 111.58 m, which was completed and put into use in 2001. During the use of the bridge, due to the influence of flood immersion Anchorage and increasing use load and other factors, the bridge appeared cable slippage, boom deviation, Anchorage displacement, and so on. With the background of this project, the research work is carried out on the basis of bridge detection and strengthening and maintenance design. The main contents are: 1. Organize and carry out the inspection work of the bridge, including appearance detection, disease investigation, linear measurement, main cable force measurement, suspension force measurement, dynamic characteristic test, etc., in order to obtain the current status information of the bridge to make up for the missing of the bridge completion data, For the performance evaluation of the bridge, mechanical analysis and reinforcement design laid a foundation. 2. The spatial finite element model of the bridge is established by Midas software to carry out computer simulation. Because there is a great difference between the measured main cable shape of the bridge and the original design line shape, based on the measured data, the purpose of the computer simulation is to measure the line shape and cable force. The calculation model of the structure which is consistent with the measured structure is obtained through the model trial calculation, and the theoretical analysis and reinforcement design calculation are carried out accordingly. According to the characteristics of the anti-wind cable, the effect of wind cable and its contribution to the stiffness of the bridge are analyzed by finite element method, and the necessity of strengthening the wind cable is demonstrated. 4. The slippage of the cable clamps in the original structural design resulted in the deviation of the suspenders. Combined with the technical ideas of strengthening design to improve the stiffness of the bridge deck, the structure of the cable clamps, the area of the suspenders, the methods and techniques of the replacement of cables were studied. A new type of cable-clamped structure of footbridge is presented. This paper analyzes the stress and displacement of the anchor ingot under the condition of water immersion, studies the influence of this condition on the anchor ingot in theory, and puts forward the concrete reinforcement measures. Based on the above theoretical analysis, a complete set of technical measures for the reinforcement design of the bridge is put forward. 105 figures, 39 tables, 50 references
【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】：U448.25;U445.72

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