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现代反应谱是以平均值作为设防水准的,但缺乏统一的概率保证,需要从概率意义上研究反应谱。搜集了中硬场地上反映最新地震活动情况的205条地震记录,建立了不同区间—周期下的三维分布概率图,发现概率图中反应谱与均值谱的比值难以集中在平均值附近,以均值确认反应谱的设防水准是不合理的。因此,建立了三维累计概率图,求得不同概率保证率下的反应谱;最后拟合8度设防水准下,不同概率保证的地震影响系数和周期之间的函数关系式。
Modern response spectrum is based on the average as the fortification level, but the lack of a unified probability guarantee, need to study the response spectrum in a probabilistic sense. A total of 205 seismic records reflecting the latest seismic activity were collected from medium-hard fields. The three-dimensional distribution probability maps of different intervals and periods were established. It was found that the ratio of the response spectrum to the mean spectrum in the probability map was hard to be concentrated in the vicinity of the average value. It is unreasonable to confirm the fortification level of the response spectrum. Therefore, a three-dimensional cumulative probability map is established to obtain the response spectrum with different probability guaranteed rates. Finally, the functional relationship between the earthquake influence coefficient and the period guaranteed by different probabilities under the 8-degree fortification standard is fitted.