摘要
本文根据反应谱与功率谱的近似转换关系构造基于非平稳过程模型的初始随机地震波。在此基础上,建议了一种基于概率理论的控制加速度峰值的方法,并把概率统计与调幅迭代技术结合起来,给出了提高随机过程反应谱拟合精度的全子样迭代法。通过宏观调幅迭代,产生满足地震动三要素(地震动强度、地震持时和频谱特性)的随机人工地震波。作为应用,文中计算了刘家峡及柯依那重力坝的抗震可靠度。计算结果与实际震害及有关分析结果一致,说明所建议的方法用于结构的抗震计算是合理可行的。
In this paper,a method is suggested for the control of the amplitude of the ground motion simulated by taking advantage of the approximate conversion between power spectrum and response spctrum.On this basis,the sample space iteration is given which aims at improving the convergence of iteration by combining probability statistics with amplitude-modulated iteration.And then,random earthquakes,which meet the needs of the three main factors of the ground motion,are generated by the use of the methods.As examples,the dynamic reliabilities of Liujiaxia and Koyna gravity dams are calculated,and the results agree with those of the acceleration-time analysis and the actural earth- quake damages.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1992年第1期38-43,共6页
Journal of Hohai University(Natural Sciences)
关键词
随机过程
人工地震波
重力坝
动力可靠度
抗震
random process
artificial earthquakes
gravity dams
dynamic reliability
