大型水电站地下厂房结构自振特性研究
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摘要
结合某大型水电站地下厂房工程实际,采用三维有限元法从边界条件、模型范围、材料特性、垫层范围和垫层失效5个方面对其自振特性进行全面、系统的研究.结果表明:采取一定的措施加强围岩与厂房上下游边界的粘结强度,能够有效提高机组支撑结构的自振频率,抑制楼板、风罩薄弱部位的低频振动;模拟范围越小,结构各阶自振频率越大;提高混凝土的强度等级对整体混凝土结构的自振特性影响较小;垫层失效后,结构的自振频率显著减小,老化后的垫层平面范围越大,高阶频率降低越多,而低阶频率变化不大.
In accordance with an underground powerhouse structure of large hydropower station,a three-dimensional finite element method has been used for natural vibration characteristic study from following five aspects:different boundary conditions,model range,material properties,the scope and failure of cushion layers.The result shows that taking certain measures to strengthen the bond strength between surrounding rock and concrete can improve the natural frequency of unit supporting structure effectively;and the low vibration frequency of floor and ventilation barrel can be inhibited.The smaller model range is,the larger natural frequency can be got.Increasing the concrete strength grade will not have significant influence on the natural vibration characteristics of the whole concrete structure.Natural frequency was significantly reduced after cushion layers were completely aging.Increasing the range of aging cushion layers can lead to the reduction of high-frequency,but little change of low frequency.
In accordance with an underground powerhouse structure of large hydropower station,a three-dimensional finite element method has been used for natural vibration characteristic study from following five aspects:different boundary conditions,model range,material properties,the scope and failure of cushion layers.The result shows that taking certain measures to strengthen the bond strength between surrounding rock and concrete can improve the natural frequency of unit supporting structure effectively;and the low vibration frequency of floor and ventilation barrel can be inhibited.The smaller model range is,the larger natural frequency can be got.Increasing the concrete strength grade will not have significant influence on the natural vibration characteristics of the whole concrete structure.Natural frequency was significantly reduced after cushion layers were completely aging.Increasing the range of aging cushion layers can lead to the reduction of high-frequency,but little change of low frequency.
引文
[1]马震岳,董毓新.水轮发电机组动力学[M].大连:大连理工大学出版社,2003.
[2]马震岳,宋志强,陈婧,等.小湾水电站地下厂房动力特性及抗震分析[J].水电能源科学,2007,25(6):72-74.
[3]李振富,赵小娜,王日宣.万家寨水电站机墩组合结构动力分析[J].水力发电学报,2004,23(2):61-65.
[4]陈婧,马震岳,戚海峰,等.宜兴抽水蓄能电站厂房结构水力振动反应分析[J].水力发电学报,2009,28(5):195-199.
[5]刘建峰.水电站地下厂房动力特性研究及地震反应分析[D].大连:大连理工大学,2007.
[6]练继建,胡志刚,秦亮,等.大型水电站地下厂房机组支撑结构动力特性研究[J].水力发电学报,2004,23(2):49-54.
[7]张启灵.水电站垫层蜗壳结构特性及厂房结构抗震研究[D].武汉:武汉大学,2010.
[8]秦亮,练继建.模拟范围对水电站机组支承结构动力特性的影响研究[J].武汉大学学报(工学版),2005,38(6):58-61.
[2]马震岳,宋志强,陈婧,等.小湾水电站地下厂房动力特性及抗震分析[J].水电能源科学,2007,25(6):72-74.
[3]李振富,赵小娜,王日宣.万家寨水电站机墩组合结构动力分析[J].水力发电学报,2004,23(2):61-65.
[4]陈婧,马震岳,戚海峰,等.宜兴抽水蓄能电站厂房结构水力振动反应分析[J].水力发电学报,2009,28(5):195-199.
[5]刘建峰.水电站地下厂房动力特性研究及地震反应分析[D].大连:大连理工大学,2007.
[6]练继建,胡志刚,秦亮,等.大型水电站地下厂房机组支撑结构动力特性研究[J].水力发电学报,2004,23(2):49-54.
[7]张启灵.水电站垫层蜗壳结构特性及厂房结构抗震研究[D].武汉:武汉大学,2010.
[8]秦亮,练继建.模拟范围对水电站机组支承结构动力特性的影响研究[J].武汉大学学报(工学版),2005,38(6):58-61.
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