场地特征周期与抗震设计反应谱的连续化方法

首先,分析场地土分类的模糊性特征,给出四类标准场地二维隶属函数的空间分布,实现场地的模糊化分类;然后,给出场地特征周期连续化方法及其空间分布图,该方法所确定的特征周期分布与建筑抗震规范给出的特征周期等值图吻合较好;最后,以二维隶属函数及其相应的标准设计反应谱为基础,给出四类标准设计反应谱的模糊化方法,建立基于标准场地二维隶属函数和连续化特征周期的两种设计反应谱的连续化方法,给出其空间分布,探讨连续化设计反应谱的工程应用。实践表明:所建立的连续化设计反应谱实现四类标准场地所对应设计反应谱的中间过渡,能更客观反映具有复杂不确定性、模糊性和变异性特征的工程场地的现实情况,为更合理地考虑场地实际特征影响,更客观科学地确定抗震设计反应谱和地震作用提供新的思路和方法。

Continuity method of the site characteristic period and the aseismic design response spectra

Firstly,we analysized fuzzy natures of the site soil classification;presented the four standard sites membership function and their two-dimensional spatial distribution and realize the fuzzy classification.Secondly,we introduced continuum method of the site characteristic period and their spatial distribution.The practice shows that the characteristic period distribution determined by this method is well agereement with the equivalent chart of the current construction code.At last,on the basis of the two-dimensional membership function and the corresponding standard design response spectrum,we gave four types of fuzzy response spectrum methods;established an arbitrary site design response spectrum continuum method and spatial distribution;discussed the engineering application of design response spectrum.Practice shows that: Fuzzy response spectrum can fulfill more smooth transition for four sites standard design response spectra.It can more objectively reflect the complex uncertainty,fuzzification and variability of the actual site characteristics;and provide new ideas and methods for more reasonable to consider characteristics of the actual site,more scientifically determine seismic design earthquake response spectrum.