泸定水电站泄洪洞进水塔结构抗震安全分析
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摘要
水电站泄洪洞进水口结构的安全关系到整个电站的安全和效益,泸定水电站泄洪洞进水口工程规模大,特别是2号泄洪洞进口塔体较高,其体型和边界受力情况都较为复杂。通过三维有限元对2号泄洪洞开展动、静力分析研究,计算分析了进水塔结构的自振特性,并通过反应谱方法计算了在水平向地震作用下进水塔结构的动力响应,包括动位移、动应力和加速度分布,论证了其抗震安全性。计算结果表明,在地震力作用下,进水塔结构的变形与强度均能满足要求,但在抗震薄弱部位应力较大,在结构设计时需采取特殊措施,以确保塔体结构的安全。计算结果可为进水塔结构设计提供科学依据。
The safety of the structure in the spillway tunnel intake of the hydropower station is very important in the security and benefit of the entire hydropower station.The spillway tunnel intake of Luding Hydropower Station is a large-scale project,especially,with the high NO.2 spillway tunnel intake tower,which has a complex body form and boundary conditions.Through a 3D-FEM static and dynamic analysis of the NO.2 spillway tunnel,the self-vibration characteristics of the intake tower structure is studied.Furthermore,this paper,through the response spectrum method,research is done on the dynamic response of the intake tower structure,including the dynamic displacement,dynamic stress and the acceleration distribution,by the horizontal earthquake,and the safety of the earthquake resistance is demonstrated.The result shows that,the deformation and intensity of the intake tower structure meet demands.However,the stress is very high in the weak earthquake-resistant region where special measures should be taken to ensure the security of the tower structure.The results will provide a scientific base for the design of the intake tower structure.
The safety of the structure in the spillway tunnel intake of the hydropower station is very important in the security and benefit of the entire hydropower station.The spillway tunnel intake of Luding Hydropower Station is a large-scale project,especially,with the high NO.2 spillway tunnel intake tower,which has a complex body form and boundary conditions.Through a 3D-FEM static and dynamic analysis of the NO.2 spillway tunnel,the self-vibration characteristics of the intake tower structure is studied.Furthermore,this paper,through the response spectrum method,research is done on the dynamic response of the intake tower structure,including the dynamic displacement,dynamic stress and the acceleration distribution,by the horizontal earthquake,and the safety of the earthquake resistance is demonstrated.The result shows that,the deformation and intensity of the intake tower structure meet demands.However,the stress is very high in the weak earthquake-resistant region where special measures should be taken to ensure the security of the tower structure.The results will provide a scientific base for the design of the intake tower structure.
引文
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[2]水工混凝土结构设计规范(DL/T 5057-1996)[M].北京:中国电力出版社,1997.
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[4]赵兰浩.考虑坝体_库水_地基相互作用的有横缝拱坝地震响应分析[D].河海大学,2006.
[5]陈灯红,彭刚,周丽娜,等.龙滩水电站左岸拐弯坝段动力结构分析研究[J].中国农村水利水电,2007,(8):111-114.
[6]彭翠玲,李声平,吴杰芳,等.水布垭水电站进水塔结构抗震分析与安全评估[J].长江科学院院报,2005,22(5):50-52.
[7]水工建筑物抗震设计规范(DL 5073-2000)[M].北京:中国电力出版社,2001.
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