摘要
Abstract
Taking the powerhouse of a hydropower station in Africa as the research object,this study explores the global and local dynamic characteristics of the powerhouse under different joint and structural layout conditions.A three-dimensional finite element model was established,considering the actual dimensions and material parameters of various parts of the powerhouse.External loads such as live loads,water pressure,and soil pressure were simulated as additional mass.The analysis results show that different joint boundary conditions significantly affect the natural vibration characteristics of the powerhouse.The study also compares the natural frequencies of the powerhouse with the excitation frequencies of the units that may induce resonance to assess the possibility of resonance between the powerhouse and the unit vibration sources.The first three natural frequencies of the powerhouse structure for Unit 1 are 45.72 Hz,49.00 Hz,and 52.05 Hz,while those for Units 2-3 are 68.10 Hz,87.04 Hz,and 90.00 Hz,respectively.This indicates that the natural frequencies of the non-jointed Units 2-3 are significantly higher than those of Unit 1,reflecting an enhancement in overall stiffness.The first natural frequencies of the unit pier and wind shield for Units 1-3 are 43.22 Hz,55.91 Hz,and 65.73 Hz,respectively,showing an increasing trend from the left to the right side of the powerhouse,primarily due to the influence of different unit structural layouts.The findings of this study can provide a reference for the design and vibration analysis of hydropower station powerhouses.关键词
水电站厂房/动力特性/自振频率/分缝/机械振源/机墩风罩/结构刚度Key words
Hydropower station powerhouse/dynamic characteristics/natural frequency/joint boundary conditions/mechanical vibration sources/unit pier and wind shield/structural stiffness分类
建筑与水利
