【作者】 梁跃华；

【导师】 亢景付；

【作者基本信息】 天津大学 ， 结构工程， 2007， 硕士

【摘要】 吉沙水电站位于云南省迪庆香格里拉县虎跳峡镇境内,金沙江支流硕多岗河上,吉沙水电站拦河坝为混凝土重力坝,采用坝身孔口泄水,共设2个表孔和1个泄洪冲沙底孔及一个冲沙孔,其中泄洪冲沙底孔和冲沙孔布置在同一坝段上;吉沙水电站泄洪冲沙底孔坝段虽然宽度较窄,但整个坝段布置了泄洪冲沙底孔、冲沙孔、灌浆廊道、弧形工作门、平板事故门等,故此坝段坝体结构相对比较复杂。受北京国电水利电力工程有限公司委托,对整个泄洪冲沙底孔坝段进行三维有限元数值分析,为拦河坝泄洪冲沙底孔坝段的体型和结构设计提供依据。本文除了对该工程进行三维有限元仿真分析外,还做了一些非常有意义的工作:1.在坝基范围的选取方面,通过采用有限元方法计算不同的坝基范围以及采用有限元-无限元耦合方法,研究不同的坝基取值范围对坝体建基面应力的影响,为用有限元计算方法选取合理的坝基取值范围提出了建议,本文中选用6倍的坝高作为坝基的计算范围。2.在研究坝踵应力集中问题时,针对该重力坝是低坝,相对高坝而言坝踵的拉应力不是很大,除了在坝踵区域加密网格按照规范要求计算坝踵区域拉应力长度外,还通过将坝踵区域尖角修圆,以修圆后坝踵区域的应力极大值作为实际坝踵区域应力值的参考。3.针对扬压力及拟静力法地震荷载施加方法的特殊性,本文在ANSYS软件的基础上利用IPDL语言编制了相应的荷载施加程序;此外还通过利用对应力的面积积分编制了将截面应力转化为截面内力的实用程序,与以往的路径积分以及利用AUTOCAD进行积分等方法相比,程序能够从根本上解决问题,应用范围广,结果更为精确,为结构构件的配筋计算提供了方便,具有较大的实用价值。更多还原

【Abstract】 Jisha hydropower station is located on Shuoduogang River which is the branch of Jinsha River in Hutiaoxia Town of Diqingxianggelila County of Sichuan Province. The barrage of the Jisha hydropower station ,which is a concrete gravitational dam, has two external holes, one sand-sweeping hole and a hole which discharges flood and sweeps the sand, the last two holes are on the same segment of the dam. The dam’s width of the station is narrow, but it has too many holes in the dam, such as: the hole which discharges flood and sweeps the sand, the sand-sweeping hole, one grouting gallery, one arc-shaped work door, and a flat-panel door which prevents the trouble and so on. So the dam is a much more complex structure. Entrusted by National Hydraulic and Electric Engineering Limited Company in Beijing, the thesis will analyze the stress distribution of the whole dam with 3-D finite element analysis method, then provide the basis for the structural and bodily form design of the dam.This thesis makes out some significative work besides analyze the project, such as:1. In selecting the range of the dam foundation, the thesis analyzes the impact on the stress of the dam by finite element analysis method and finite-infinite element method in choosing different dimension of the foundation. In this thesis six-times of dam’s height was chosen as the range of the foundation.2. While this dam is low, the stress in the hell of the dam relatively small, we try making the hell become round and then treat the maximum stress as the referenced in the hell of the dam, besides thickening the mesh of the finite elements and treating the length of the tensile stress as the criterion, according to the code in the region of the dam hell.3. This thesis made some programs, using IPDL language of ANSYS software, about uplifting pressure and pseudostatic-seismal load as they are peculiar when put on the dam. It also made a program which changing the stress integral to the force in an arbitrary section. Comparing to the stress-path integral and AUTOCAD method, this program has a wider use and much more accurate result, so it will get relatively high practical value.更多还原