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计算分析了333组震中距小于40 km的欧洲及其毗邻地区的近场强震动记录的峰值加速度和3种频谱周期参数,采用回归分析方法,探讨了场地类别、震级、震中距等因素对近场地震动特性的影响特征,并统计给出了不同类别场地和震级档的近场地震动峰值加速度和频谱周期的衰减关系。结果表明:震中距是影响近场强震动峰值加速度和频谱特性的重要因素,随着震中距的增大近场强震动峰值加速度逐渐减小;特征周期参数基本上满足随着震中距增大而增大的趋势,且场地越软这一趋势越明显;因为近场地震动的复杂性,场地类别和震级对峰值加速度和特征周期有一定的影响,但具有不确定性。竖向与水平向地震动的加速度峰值比均值为0.60,但约有1/3的强地震动记录加速度峰值比大于2/3;竖向地震动的特征周期约为水平向地震动的0.8倍,且场地越软该值越小。
The peak acceleration and three kinds of spectral period parameters of near-field strong motion records in 333 groups of less than 40 km in epicenter distance were calculated and analyzed. Regression analysis was conducted to investigate the effects of site type, magnitude, Field vibration characteristics of the impact characteristics, and statistics of different types of sites and magnitude file near-field ground motion peak acceleration and the attenuation of the spectral period. The results show that the epicentral distance is an important factor affecting the peak acceleration and spectral characteristics of the near-field vibration. The peak acceleration of the near-field vibration decreases with the increase of the epicentral distance. The characteristic periodic parameters basically satisfy the following: And the softer the site, the more obvious the trend is. However, the complexity of near-field ground motion, the type of site, and the magnitudes have certain influence on the peak acceleration and characteristic period but are uncertain. The average acceleration peak value of vertical and horizontal ground motions is 0.60, but about one-third of the strong ground motions have a peak acceleration acceleration ratio of more than 2/3. The characteristic period of vertical ground motions is about 0.8 times the horizontal ground motions , And the softer the site, the smaller the value.