考虑拦污栅-坝体相互作用的混凝土重力坝抗震安全性分析
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摘要
对考虑拦污栅-坝体的动力相互作用的弹性连接和刚性连接的拦污栅-坝体以及不作耦联分析的拦污栅-坝体这三种不同模型结构形式的动力特性和动力响应进行了比较分析。研究发现,拦污栅的不同模型结构形式对大坝的抗震安全性分析有重要影响,考虑拦污栅-坝体的动力相互作用后,坝体损伤开裂的程度明显加大,坝顶的水平位移响应也明显提高。按《规范》规定的对拦污栅和坝体不作耦联分析的抗震计算方法,所得结果对坝体是偏于不安全的,而如考虑拦污栅-坝体之间的弹性连接,所得结果则是偏于安全的。
Three different models of considering trash rack-dam interaction are introduced for analyzing dynamic characteristics and dynamic response of a concrete gravity dam in this paper.Elastic connection and rigid connection between trash rack and dam,as well as uncoupled interaction of the trash rack and dam have been considered.The results show the models for simulating trash rack-dam interaction all have a great effect on seismic safety analysis of the concrete gravity dam.The crack depth of the dam and the displacement of the dam crest increase obviously with the trash rack-dam interaction.The predicted result according to China Code is biased unsafe for the dam.However,the result considering elastic connection between trash rack and dam is biased safe for the dam.
Three different models of considering trash rack-dam interaction are introduced for analyzing dynamic characteristics and dynamic response of a concrete gravity dam in this paper.Elastic connection and rigid connection between trash rack and dam,as well as uncoupled interaction of the trash rack and dam have been considered.The results show the models for simulating trash rack-dam interaction all have a great effect on seismic safety analysis of the concrete gravity dam.The crack depth of the dam and the displacement of the dam crest increase obviously with the trash rack-dam interaction.The predicted result according to China Code is biased unsafe for the dam.However,the result considering elastic connection between trash rack and dam is biased safe for the dam.
引文
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1河海大学.金安桥水电站工程碾压混凝土重力坝动力学分析及抗震安全性评价报告.2008.
[2]蔡新,武颖利,郭兴文.混凝土坝及坝后式厂房整体地震响应分析[J].河海大学学报(自然科学版),2008,36(1):49-53.Cai X,Wu Y L,Guo X W.Integral seismic responseanalysis of concrete dam and powerhouse at dam toe[J].Chinese Journal of Hohai University(Natural Sci-ences),2008,36(1):49-53.
[3]吴丹.观音岩电站拦污栅结构动力特性分析[J].水利科技与经济,2007,13(2):81-83.Wu D.Seismic strength analysis of trashrack ofguanyinyan hydropower station[J].Chinese Journalof Water Conservancy Science and Technology and E-conomy,2007,13(2):81-83.
[4]严根华.水电站拦污栅振动特性和抗振设计研究[J].水力发电,2006,32(10):77-88.Yan G H.Study on the vibration characteristics oftrash rack of hydropower station and its anti-vibrationdesign[J].Chinese Journal of Water Power,2006,32(10):77-88.
[5]DL 5073-2000,水工建筑物抗震设计规范[S].
[6]艾亿谋,杜成斌,洪永文.考虑应变速率影响的混凝土重力坝非线性地震响应分析[J].防灾减灾工程学报,2007,27(3):290-295.Ai Y M,Du C B,Hong Y W.Nonlinear seismic re-sponses analysis of gravity dam considering strain rateeffect[J].Chinese Journal of Disaster Prevention andMitigation Engineering,2007,27(3):290-295.
[7]Westgaard H M.Water pressures on dams duringearthquake[J].Transaction of the American Societyof Civil Engineers,1993,(98):418-433.
[8]张子明,杜成斌,周星德.结构动力学[M].北京:清华大学出版社,2008.Zhang Z M,Du C B,Zhou X D.Dynamic of Struc-tures[M].Beijing:Tsinghua University Press,2008.
1河海大学.金安桥水电站工程碾压混凝土重力坝动力学分析及抗震安全性评价报告.2008.
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