上岸大桥高墩曲线连续刚构内力分析与研究

发布时间：2018-04-01 13:30

本文选题：高墩曲线连续刚构　切入点：静动力　出处：《福建农林大学》2017年硕士论文

【摘要】：高墩曲线连续刚构桥以其线形适应性强、施工简便、跨越能力大等不可替代的优点,在工程实际应用中得到越来越多的应用。但是由于弯扭耦合、高墩稳定等现象的存在,使得其静动力分析很复杂,因此有必要对高墩曲线连续刚构桥进行专门的内力分析与研究。本文针对福建泉州上岸大桥的设计情况,在查阅了大量相关文献的基础上,结合本人对高墩曲线桥梁理论和设计的系统学习,以高墩曲线连续刚构桥的内力分析为核心内容,对以下几方面问题进行了研究。结合上岸大桥的工程实际,利用Midas/civil建立有限元计算模型,对所建立的模型进行静力特性与稳定性分析,得出最大悬臂阶段和成桥运营阶段高墩曲线连续刚构桥静力与稳定性的空间特性,并且改变结构几何参数——曲率半径、墩高,分析静力特性与桥梁稳定性随之变化的一般规律;针对桥梁15新规范删除离心力计算半径限制的问题,考虑曲率半径和墩高的影响,通过对主梁内力变化规律的研究,总结得出高墩曲线连续刚构桥离心力计算的曲率半径和墩高的分析界限;在动力力学性能方面,利用反应谱分析法研究曲线连续刚构桥的自振特性与动力响应,并研究曲率半径对动力性能的影响,总结结论规律。通过上述研究,得出关于高墩曲线连续刚构桥的静动力方面一些有实用价值的结论,为该桥型的设计、施工及监控提供理论上的参考。
[Abstract]:Curved continuous rigid frame bridges with high piers have been applied more and more in engineering practice because of their irreplaceable advantages, such as strong adaptability, simple construction and large span capacity. However, due to the coupling of bending and torsion, the stability of high piers exists. The static and dynamic analysis of the bridge is very complicated, so it is necessary to carry out special internal force analysis and research on the curved continuous rigid frame bridge with high piers. Based on the systematic study of the theory and design of curved bridges with high piers, and taking the internal force analysis of curved continuous rigid frame bridges with high piers as the core content, the following problems are studied. The finite element calculation model is established by Midas/civil, and the static characteristics and stability of the model are analyzed, and the spatial characteristics of the static and stability of the curved continuous rigid frame bridge with high pier in the maximum cantilever stage and the operation stage of the bridge are obtained. And change the geometric parameter of structure-curvature radius, pier height, analyze the general rule that static characteristic and bridge stability change with it, considering the influence of curvature radius and pier height to the problem of removing the limit of centrifugal force calculation radius in the new specification of bridge 15. Based on the study of internal force variation law of main beam, the analytical limits of curvature radius and pier height for centrifugal force calculation of curved continuous rigid frame bridge with high piers are obtained. The natural vibration characteristics and dynamic response of curved continuous rigid frame bridges are studied by means of response spectrum analysis, and the influence of radius of curvature on dynamic performance is studied. Some practical conclusions on static and dynamic characteristics of curved continuous rigid frame bridge with high piers are obtained, which provide theoretical reference for the design, construction and monitoring of the bridge.
【学位授予单位】：福建农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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