混凝土坝及坝后式厂房整体地震响应分析
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摘要
以某水电站工程为例,建立了独立坝体计算模型、独立厂房计算模型和考虑大坝坝体、背管及厂房的整体三维有限元仿真计算模型;在对这3个模型进行自振特性分析和基于反应谱法的地震动力响应计算的基础上,分析了地震条件下整体计算模型坝体、背管和厂房连接处的位移工作性态及其相互作用,比较了分块计算模型和整体计算模型对工程影响的差异.结果表明:独立模型不能反映坝体厂房之间相互作用对固有频率产生的影响;在进行谱分析时,整体模型要选取更多阶的谱值才能反映高阶频率对位移的影响.
A case study was performed on a hydropower station,and two separate calculation models respective for the dam body and powerhouse and a 3D integral finite element simulation model for dam body,back pipe,and powerhouse were developed.Based on the natural-vibration characteristic analysis of 3 models and seismic response calculation with the response spectrum method,the working behavior of the integral calculation model about displacement at joints of the dam body,back pipe and powerhouse and their interaction during earthquakes were analyzed,and the differences between the effects of the separate models and integral model on structures were compared.The result shows that the separate models could not reflect the effect of the interaction between the dam body and powerhouse at natural frequency,while for spectrum analysis by the integral model,more spectrum values should be selected to reflect the influences of high-order frequency on displacement.
A case study was performed on a hydropower station,and two separate calculation models respective for the dam body and powerhouse and a 3D integral finite element simulation model for dam body,back pipe,and powerhouse were developed.Based on the natural-vibration characteristic analysis of 3 models and seismic response calculation with the response spectrum method,the working behavior of the integral calculation model about displacement at joints of the dam body,back pipe and powerhouse and their interaction during earthquakes were analyzed,and the differences between the effects of the separate models and integral model on structures were compared.The result shows that the separate models could not reflect the effect of the interaction between the dam body and powerhouse at natural frequency,while for spectrum analysis by the integral model,more spectrum values should be selected to reflect the influences of high-order frequency on displacement.
引文
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[2]DL5073—2000,水工建筑物抗震设计规范[S].
[3]郝文化.ANSYS在土木工程应用实例[M].北京:中国水利水电出版社,2005.
[4]胡志刚.大型水电站地下厂房结构振动计算研究[D].天津:天津大学,2003.
[5]李正农,杨世浩,蔡元奇,等.混凝土重力坝厂房坝段单、双孔口方案动力有限元分析与比较[J].武汉水利电力大学学报,1998,31(2):22-24.
[6]万文智,窦兴旺.关于地震动输入机理的分析与探讨[J].大坝观测与土工测试,2000,24(6):18-19.
[7]陈建云,李静,林皋.基于率性损伤模型的混凝土重力坝地震响应分析[J].哈尔滨工业大学学报,2005,37(6):786-789.
[8]何蕴龙,陆述远,王宏硕.碾压混凝土重力坝地震动力分析[J].武汉水利电力大学学报,1998,31(1):11-15.
[9]黄劲松,潘燕芳,闫慧玉.大朝山碾压混凝土重力坝静、动力有限元计算分析[J].武汉大学学报:工学版,2003,36(6):22-26.
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