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特征周期是反应谱的重要参数,《建筑抗震设计规范》(GB 50011—2010)规定特征周期为设计反应谱曲线下降段起点对应的周期.根据概率法选取28条完整地震记录,利用自编Fortran程序进行地震影响系数的计算,得到反应谱曲线.通过概率法计算不同面积百分比下的特征周期;按美国ATC 3-06规范确定有效峰值速度和有效峰值加速度,计算特征周期,进行反应谱特征周期的统计分析.统计表明:特征周期随面积百分比减小逐渐增大.特征周期与反应谱曲线形状有关,当平台段末端的反应谱曲线波动时,特征周期值会有明显变化.概率法求特征周期当面积百分比在90%~97%时,特征周期取值比较稳定,和平均值接近.概率法计算得到的特征周期平均值与美国ATC 3-06规范计算得到的特征周期平均值相差不大,有较好的参考价值.
The characteristic period is an important parameter of the response spectrum, and the characteristic period is defined as the period corresponding to the starting point of the descending section of the curve of the design response curve according to the Code for Design of Seismic Design of Buildings (GB 50011-2010). According to the probabilistic method, 28 complete seismic records are selected, Program to calculate the influence coefficient of the earthquake and obtain the response spectrum curve, calculate the characteristic period under different area percentages by using the probability method, determine the effective peak speed and the effective peak acceleration according to the American ATC 3-06 standard, calculate the characteristic period, and perform the characteristic period of the response spectrum The statistical analysis shows that the characteristic period increases with the decrease of the area percentage.The characteristic period is related to the curve shape of the reaction spectrum and the characteristic period value changes obviously when the response spectrum curve at the end of the platform section fluctuates. Periods When the area percentage is in the range of 90% -97%, the characteristic period value is relatively stable, and the average value is close. The average of the characteristic period calculated by the probability method is not significantly different from the average value of the characteristic period calculated by the ATC 3-06 , A better reference value.