水电站厂房高频振动和立柱裂缝分析

【作者】 徐锦生；

【导师】 马震岳；

【作者基本信息】 大连理工大学 ， 水利水电工程， 2003， 硕士

【摘要】 本文以红石水电站厂房为计算实例，利用Ansys结构分析软件，建立了厂房整体结构的有限元模型，并在此模型的基础上进行结构分析。 全文工作如下： 1．对整个厂房结构模型进行静力、动力分析计算。计算结果表明，温度应力、动应力并没有超过强度设计标准值。本论文认为，强度破坏不是红石水电站厂房立柱产生裂缝的最根本和直接原因。 2．红石水电站机组振动引起厂房及大坝等建筑物剧烈振动，国内外这样严重的振动尚无先例，据已掌握的国内外文献也未见到类似的严重振动情况。本文结合以前的工作和现场测试成果，对整个厂房模型进行模态分析和谐响应分析。研究发现，机组转速频率和转轮叶片数振动频率(即4倍转频和5倍转频)与厂房结构的某几阶自振频率接近，错开度很小，产生共振，导致厂房立柱在高程277.5m处应力、位移值均较大，应当采取相应抗振加固措施。 3．研究了在动静力荷载作用下，红石水电站厂房立柱在高程277.5m处开裂的疲劳特性。采用子结构模型分析技术，计算了裂纹尖端的应力强度因子，从疲劳断裂力学的角度以及混凝土开裂机理上探讨了裂缝产生、开展的根本原因，给出了合理的解释。 本文的计算及理论分析均与实际工程相结合，有着很大的实际应用价值，对其他水电站建设、运行及管理也有着较高的参考价值。更多还原

【Abstract】 In this thesis is the calculation example with the Hongshi hydropower station factory building, and use structural analysis software Ansys establish the factory building overall structure finite element mode , and is living that the line structure analysis is make progress in this base.The main works in this paper are as follows:1. Dynamic and static analysis of whole structure of Hongshi plant is made. Result indicate , The computational solution makes known , and temperature stress and stirs stress does not overtake the intensity design rating , and is not that the factory building vertical column in Hongshi hydropower station into being the fundamental reason of crack.2. The vibration of unit Hongshi hydropower station causes violent vibration of the plant and the dam, which has not been occurred interiorly before. And such serious vibration has not been found according to foreign literature. In this paper, referring to the achievement of in - situ test, and on the basis of selecting model of Hongshi hydropower station, dynamic and static analysis of whole structure of Hongshi plant is made. We have gained a clear idea of the main reasons of the violent vibration. A reasonable to solve the problem stated above is dvanced.3. Dynamic and static analysis of whole structure of Hongshi plant is made is elevation 277. 5m part what the fatigued property. Columniation of Hongshi hydropower station has fatigue Moreover in through the beton split what unfolds the mechanism to characteristic, the contributing factor in split do the inquirement further .The computation and the theoretical analysis in this paper are both integrated with actual project which is running or being built, which has good practical applying value and good value to constructing and running other hydropower station.更多还原