【作者】 杜成伟；

【导师】 柴军瑞；

【作者基本信息】 西安理工大学 ， 水工结构工程， 2010， 硕士

【摘要】 我国水能资源居世界之首,但分布不均,约80%集中在西部,主要是西南地区。但该区处于新构造运动强烈、地质环境极不稳定的高山峡谷区,为强烈地震和地质灾害高发区。目前在建和拟建一系列200米至300米级的高坝,如小湾、构皮滩、溪洛渡、白鹤滩、锦屏、糯扎渡、拉西瓦、乌东德、大岗山等战略性工程,都在这一地区,其规模巨大、地震烈度高。在这一地震高烈度区,抗震安全多为工程建设中的关键。5.12汶川大地震让人们更加清晰的认识到了这一点。首先介绍了结构静力动力分析理论、流固耦合问题的有限元计算方法,从流固耦合的角度出发,对坝库相互作用的机理进行了研究,利用FORTRAN语言,编制了坝体-库水-地基耦合系统的有限元程序。对某重力坝某坝段和某拱坝拱冠梁进行了计算,分析了有质量地基模型和无质量地基模型,探讨了现行规范中附加质量模型和考虑坝库相互作用的流固耦合模型,可以看出流固耦合模型与附加质量模型相比结构大部分部位的结果较小,但更能反映库水-坝体相互作用的实际情况。利用大型有限元ADINA软件,基于ADINA软件建立坝库系统流固耦合模型,分别进行了模态分析、地震时程响应分析。以某拱坝为例,研究了库水位和库水压缩性对拱坝模态和自振频率等的影响。作为工程应用,以某拱坝工程为例,建立拱坝-库水-地基系统相互作用的动力耦合模型,对其进行了动力特性和地震响应的计算分析,得出了一些可供工程设计参考的有价值成果。更多还原

【Abstract】 Hydropower resources in China ranks first in the world, but their distribution is uneven, about 80% concentrated in the west, mainly southwest. This area is a new strong tectonic movement and highly volatile geological environment mountain valley areas, which has a high incidence of strong earthquakes and geological hazards. At present, under construction and proposed a series of 200-300 m level high dams, such as Xiaowan, Goupitan, Xiluodu, Baihetan,Jingpin,Nuozhadu, Laxiwa, Wudongde, Dagangshan and so on.strategical project are all in these high earthquake intensity areas. Seismic safety is the key point in these high earthquake intensity areas, shocking earthquake which happened in Sichuan province China on May 12th in 2008 make people more clearly recognized this.This paper describes dynamic analysis theory of structure, fluid-solid coupling problem of the finite element method. From the point of view of fluid-solid coupling, deep research has been made on the principle of the dam and reservoir interaction. Through using FORTRAN language, developed a finite element program of dam-water-foundation system interaction.Calculate a gravity dam and an arch crown beam by the FORTRAN programme, Qualitatively analyze the quality foundation model and the massless foundation model, discuss the additional mass model of current specification and the fluid-solid coupling model basing on interaction theory, Compared to the additional mass model, we can see that the fluid-solid coupling mode has smaller results at most parts, which better reflects the actual dam-water interaction.By using large-scale finite element software ADINA, establish dam-water system’s fluid-solid coupling model, conducted modal analysis, seismic time-history response analysis, and then give an arch dam example, and study the arch dam’s mode and self-vibration which is affected by the water level and the reservoir water compression. As an engineering application, establish dam-water-foundation system’s fluid-solid coupling model through a arch dam, calculate the dynamic characteristics and seismic response of the arch dam, and obtained some valuable results for the engineering design.更多还原