【摘要】 以平均值作为决策反应谱设防水准的参数,缺乏概率意义,值得进一步深入研究。本文研究了中软场地上各条地震反应谱与平均值之比(变化曲线)的分布概率,建立了周期、变化区间、概率的三维分布概率图,发现不同周期、不同区间下概率分布十分分散,难以集中在平均值附近,揭示了仅以平均值作为反应谱设防水准的参数并不十分合理,用概率来表述反应谱特征更加科学。因此,建立三维累积概率分布图,求得不同概率保证率下的反应谱。最后,拟合出8度设防水准下不同概率保证的地震影响系数与周期之间的函数关系。更多还原

【Abstract】 The response spectrum taking the mean value as fortification level parameter,lack of probability,is worth further thoroughly study.The distribution probability of the ratio(change curve) of each seismic response spectra to the mean value in the medium-soft site is discussed in this paper.When periods,change interval and the probability of three-dimensional distributed probability chart are established,it is found that the probability distribution extremely dispersers in different periods and intervals,and it is not very likely to be centralized around the average.Thus,it is not very reasonable to take the mean value as the sole parameter of response spectrum fortification level.However,it is more appropriate to use probability to demonstrate the characteristics of response spectrum.Therefore,it is necessary to establish the cumulative probability distribution of the three-dimensional maps,and obtain response spectrum under different probability guarantee rate.Finally it is able to fit the functional relationship between the earthquake influence coefficient guaranteed by different probability and periods under eight minimum security standards.更多还原