吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 876-885.doi: 10.13278/j.cnki.jjuese.201503202
蒋其峰, 荣棉水, 彭艳菊
Jiang Qifeng, Rong Mianshui, Peng Yanju
摘要:
动剪切模量比的不确定性会对场地地震反应计算的结果产生较大的影响,而目前对这种影响的研究多限于定性分析,笔者利用渤海海域典型场地对这一影响进行定量分析。首先,建立了土层地震反应计算模型;然后,在不改变影响土层地震反应计算结果其他参量的前提下,赋予了原动剪切模量比一系列偏差并求得了场地反应谱的变化;最后,得到了反应谱对动剪切模量比的敏感度。结果表明:1)在动剪切模量比曲线增大(或减小)后,在基准反应谱的特征周期附近,存在一个反应谱相对于基准反应谱由增大转变为减小(或由减小转变为增大)的转变点。2)在概率水准2和3下:反应谱平台段对动剪切模量比的敏感度最高,其值基本上分布在1.0~3.0;反应谱下降段的敏感度绝对值随着周期的增大先迅速增大后逐渐趋于0,最大值达1.0以上;反应谱上升段的敏感度分布平稳,其值多分布在1.0~2.0。
中图分类号:
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