进水塔结构的抗震分析和稳定性研究

发布时间：2018-02-09 15:25

本文关键词： 进水塔抗震分析谱分析高地震烈度区稳定性　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：进水塔是一种体型结构、边界条件以及受力情况都比较复杂的水工建筑物,一般是采用钢筋混凝土薄壁空腹箱形结构,建在靠近岸边的水库中,顶部用工作桥与河岸连接,其外围四周皆承受水压力,因此进水塔在地震作用下的安全十分重要。水电站进水塔作为地下引水系统的首部结构,其抗震安全性关系到整个水电站的安全和效益。由于其复杂的结构形式和边界条件,高烈度地震区岩基上进水塔结构的地基—塔体—塔背山体—水体的相互作用问题十分复杂。本文结合某进水塔工程实例,通过建立三维有限元计算模型,对该进水塔进行数值模拟计算,并进行了详细的自振特性、应力与变形分析。主要内容如下： (1)系统地介绍了进水塔结构分析的发展现状,结构静动力分析理论、有限元方法及理论,总结了进水塔的合理计算方法和应力分析的方法以及应力分布的一般规律。指明了各类荷载组合工况作用对进水塔塔体应力的各自贡献及其主次地位,为工程设计提供了可靠的计算结果。 (2)完成了对进水塔实体模型的建立及有限元离散化,计算了进水塔在静荷载作用下的整体位移、应力。 (3)综合考虑各种因素,动力方面完成了结构动力特性分析,讨论了进水塔整体结构自振特性的影响因素。动力反应分析中采用振型分解反应谱方法对进水塔进行了抗震计算,分析了进水塔在横河向、顺河向和竖向地震共同作用下的地震力,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进水塔结构的抗震性能进行了评估。计算结果符合实际,说明对该进水塔的应力和变形的仿真模拟计算是成功的。 (4)对进水塔结构的抗滑稳定性、抗浮稳定性、抗倾覆承载能力、底板和基岩的承载能力极限状态进行了计算分析,计算结果满足要求,说明结构设计是合理和安全的。
[Abstract]:The intake tower is a kind of hydraulic structure with complicated boundary conditions and forces. It is usually a reinforced concrete thin-walled hollow box structure, built in a reservoir near the shore, the top of which is connected by a working bridge to the river bank. So the safety of intake tower under earthquake is very important. As the first structure of underground water diversion system, its seismic safety is related to the safety and benefit of the whole hydropower station. Because of its complex structural form and boundary conditions, the interaction between the foundation, tower body, mountain body and water body of the intake tower structure on the rock foundation in the high intensity seismic area is very complicated. In this paper, an example of a water intake tower is presented. The three-dimensional finite element model is established to simulate the intake tower, and the natural vibration characteristics, stress and deformation of the tower are analyzed in detail. The main contents are as follows:. 1) the development of structure analysis of intake tower, the theory of structure static and dynamic analysis, finite element method and theory are introduced systematically. The reasonable calculation method of intake tower, the method of stress analysis and the general law of stress distribution are summarized. The contribution of various load combination working conditions to the stress of intake tower and its primary and secondary status are pointed out. It provides reliable calculation results for engineering design. 2) the solid model of the intake tower and the finite element discretization are completed, and the integral displacement and stress of the intake tower under static load are calculated. 3) considering all kinds of factors synthetically, the dynamic characteristic analysis of the structure is completed, and the influence factors of the natural vibration characteristic of the whole structure of the intake tower are discussed. In the dynamic response analysis, the seismic analysis of the intake tower is carried out by using the mode decomposition response spectrum method. The seismic force of the intake tower under the joint action of the transverse river direction, the downstream direction and the vertical earthquake is analyzed. The seismic performance of the structure is evaluated. The seismic performance of the intake tower structure is evaluated after superimposing the calculated results under static load. The calculated results are in accordance with the actual situation. It is shown that the simulation calculation of the stress and deformation of the intake tower is successful. 4) the anti-slide stability, anti-floating stability, anti-overturning bearing capacity of intake tower structure, the ultimate state of bearing capacity of bottom plate and bedrock are calculated and analyzed. The calculated results meet the requirements, and show that the structural design is reasonable and safe.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV312

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