某水库启闭塔地震反应分析

发布时间：2018-07-12 16:33

本文选题：启闭塔 + 有限元　；参考：《郑州大学》2017年硕士论文

【摘要】：水库的启闭塔是一种体型结构、边界条件和受力状况较为复杂的水工建筑物,一般采用钢筋混凝土框架结构或薄壁空腹箱形结构,建在靠近坝坡或岸边的水库中,顶部通过工作桥与坝顶或岸坡连接,塔体处于水体包围之中。一旦启闭塔遭到破坏不能正常取水,将直接影响水库的供水等功能,这将对居民的生产生活造成巨大影响。启闭塔一般为高耸结构,其在地震作用下的安全非常重要。本文系统地介绍了启闭塔静动力分析的发展现状,结构静动力分析理论、有限元方法和ANSYS的应用实现,总结了启闭塔的合理计算方法和应力应变分布的一般规律。本文结合某水库启闭塔工程实例,利用大型三维有限元分析软件ANSYS建立有限元计算模型,对该启闭塔进行数值仿真模拟计算,并进行了具体的自振特性、应力与变形分析。通过ANSYS的前后处理器的功能,不仅完成了启闭塔实体模型的建立及有限元离散化,还模拟计算了启闭塔在地震荷载作用下的整体动位移及应力应变,得到各个工况下塔体结构节点的位移及应力的时间历程变化曲线。综合考虑各种因素,动力方面完成了结构动力特性分析,探讨了启闭塔整体结构自振特性。懫用时程分析方法对启闭塔进行了抗震计算,分析了启闭塔在垂直水流方向、顺水流方向和竖向地震共同作用下的地震反应,评价了该结构的抗震性能,并与静荷载作用下的计算结果叠加后对启闭塔结构的抗震性能进行了评价。最后,依据规范采用分项系数法分别对启闭塔的抗滑稳定性、抗倾覆稳定性以及地基承载力进行了校核验算,结果表明,各项安全系数满足规范要求,结构设计是合理和安全的。
[Abstract]:The opening and closing tower of the reservoir is a kind of hydraulic structure with complicated boundary conditions and stress conditions. It is usually built in a reservoir near the dam slope or the bank of the reservoir by using reinforced concrete frame structure or thin-walled hollow box structure. The top is connected with the dam top or bank slope through the working bridge, and the tower is surrounded by water. Once the tower is damaged and can not fetch water normally, it will directly affect the function of water supply of reservoir, which will have a great impact on the production and life of residents. The tower is usually a tall structure, and its safety under earthquake action is very important. This paper systematically introduces the development of static and dynamic analysis of the turret, the theory of structural static and dynamic analysis, the application of finite element method and ANSYS, and summarizes the reasonable calculation method of the turret and the general law of stress and strain distribution. In this paper, the finite element calculation model is established by using the large-scale three-dimensional finite element analysis software ANSYS, and the numerical simulation calculation of the opening and closing tower is carried out, and the natural vibration characteristics, stress and deformation of the tower are analyzed. Through the function of the front and rear processor of ANSYS, not only the solid model of the opening and closing tower is established and the finite element discretization is completed, but also the whole dynamic displacement and stress strain of the opening and closing tower under the action of earthquake load are simulated and calculated. The time history curves of displacement and stress of tower structure joints are obtained. Considering all kinds of factors, the dynamic characteristics of the structure are analyzed, and the natural vibration characteristics of the whole structure of the turret are discussed. The seismic response of the turret under the combined action of vertical flow direction, downstream flow direction and vertical earthquake is analyzed, and the seismic performance of the structure is evaluated. The seismic performance of the tower structure is evaluated after superimposing the calculated results under static load. Finally, the anti-slide stability, anti-overturning stability and foundation bearing capacity of the tower are checked and calculated by the method of partial coefficient according to the code. The results show that the safety factors meet the requirements of the code. The structural design is reasonable and safe.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV698.13;TV312

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