机组振动作用下厂房机墩结构振幅计算方法研究

发布时间：2018-04-21 05:40

本文选题：机墩振幅 + 规范法　；参考：《地下空间与工程学报》2017年06期

【摘要】：水电站厂房机组的巨型化导致厂房机墩等结构尺寸的增大,传统的规范法已经无法满足设计精度的要求,因此有限元法计算得到了大力推广,但采用哪种有限元法及有限元法计算结果的合理性、其与规范法计算结果的差异等问题需得到解决。笔者通过对多电站机墩结构垂直振幅不同计算方法结果的全面比较分析,发现拟静力法的计算结果大于动力法的计算结果,而动力法大于解析法的计算结果;有限元计算模型的底部边界高程对机墩结构振幅计算影响较大,宜取相对于基准面的相对振幅,基准面宜选取在机组安装高程,对于有限元法的计算结果,用相对于安装高程的相对振幅与结构力学法的"振幅标准"进行比较更为合理。
[Abstract]:The mega size of the power plant unit leads to the increase of the structure size, such as the machine and pier of the powerhouse. The traditional code method can no longer meet the requirement of the design precision, so the finite element method has been popularized. However, the problem of which finite element method and the result of finite element method are reasonable and the difference between the results of calculation and that of standard method need to be solved. Through the comprehensive comparison and analysis of the results of different methods for calculating the vertical amplitude of the machine pier structure of multiple power stations, it is found that the result of pseudostatic method is greater than that of dynamic method, and the dynamic method is larger than that of analytical method. The bottom boundary elevation of the finite element model has a great influence on the calculation of the amplitude of the machine pier structure. The relative amplitude relative to the datum level and the installation height of the unit should be chosen as the datum level. The calculation results of the finite element method are also discussed. It is more reasonable to compare the relative amplitude of installation elevation with the "amplitude standard" of structural mechanics method.
【作者单位】：中国电建集团成都勘测设计研究院有限公司;
【分类号】：TV731.6

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