【摘要】 为了研究强地震作用下,场地类别对于地震动幅频特性的影响,本文统计了3 579条日本地震动的时程,并针对场地类别的不同,分别从基岩和土层的峰值加速度幅值特性角度,以及从标准化反应谱和平均加速度反应谱等频谱特性的角度研究其幅频衰减特性,最后给出了各类场地峰值加速度衰减曲线。结果表明,土层对于地震动幅值和频谱的放大作用会随着场地类别的变软而增加,并且场地越软,远场的长周期特性越明显。利用平均加速度反应谱可以有效地反映频谱中的长周期成分。更多还原

【Abstract】 3579 earthquake ground motions were considered to find out the influence of site condition on amplitude frequency characteristic of seismic ground motion.The peak ground acceleration amplitude characteristic for bedrock and soil,and frequency characteristics,such as standard response spectrum and average acceleration response spectrum are studied.Besides,an empirical attenuation relation is obtained for variance of earthquake parameters in different site categories.The effect of soil amplification on seismic amplitude and frequency is more strong in soft soil than in hard soil.In soft soil,there is an obvious long-period effect,which can be identified by average acceleration response spectrum.更多还原