知识与财富的链接
为满足水库抗震设计的震要,合成了５０年超越概率５％和１００年超越概率２％的基岩加速度时程曲线,考虑到吉林吉台电站所处的特殊地震环境和场地条件,分析其地震危险性认为：５０年超越概率５％的地震动为远震影响;１００年超越概率２％的地震动为近震影响,目前使用的基岩加带度反应谱衰关于关系的来源资料多少丢失一些高频成分,可能低估高频成分的地震动对基岩场地的影响,为此根据大震,远震的特征周期Ｔｇ较大这一规律,把两个概率水平的加速度反应谱的特征周期Ｔｇ都定为０．３ｓ,并增加基岩反应谱高频成分控制,从而把基岩地震加速度反应谱处理成相应的规准谱,在此基础上通过拟合规准谱合成的基岩地震动时程曲线,较好地满足坝址的设防要求。
In order to meet the needs of anti-seismic design,the time history curve s of bedrock accelerate (exceedance probability is 5% in 50 years,and 2% in 100 years) were compounded.Combined with special seismic environment and site co nditions at Jilintai Hydroelectric Station,the seismic damage was analyzed in this region.The result shows that the ground shock with 5% exceedance probabi lity in 50 years will be a distant event,and that with 2% in 100 years will be a near one.Considering the losing of high-fr equency composition of the data used to calculate bedrock acceleration response spectrum relation,the characteristic period T\-g of two kinds of probability levels was chosen as 0.3 s according to the fact that strong or distant earthquakes have bigger T\-g ,and the bedrock accelerati on response spectra were transformed into standard spectra.By fitting standard spectra,the compounded bedrock acceleration time history curves meet the anti-seismic design need s well.
