插值法在确定场地特征周期中的应用

Application of Interpolation Method in Determining the Characteristic Period of Site

特征周期是地震影响系数曲线中,反映地震震级、震中距和场地类别等因素下降起始点对应的周期值。特征周期一般根据项目所在地的设计地震分组和场地类别确定。文中以实际工程为例,着眼Ⅱ类与Ⅲ类场地分界线附近,依据规范要求,采用插值法准确地确定了特征周期。

The characteristic period is the period value corresponding to the seismic influence coefficient curve of the seismic design effect,reflecting the seismic magnitude,epicenter distance and site category.The characteristic period is generally determined according to the design seismic grouping and site category of the project location.According to the example of a porject in Nanjing,the site is near the boundary between the class site and the class site,and the characteristic period is accurately determined by the interpoal tion method according to the standard requirements.