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随机特性在地震动反应谱与强震地面运动模拟中的研究
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摘要
摘要
    现阶段抗震设计规范中的设计反应谱是代表实际地震动反应谱两水平方向
    的统计平均结果,隐含了两水平向反应谱特征周期相同的假定,其值由场地类别
    和设计地震分组确定;而地震影响系数最大值则根据烈度确定。对于垂直方向设
    计反应谱,规范中规定为水平向各周期点设计谱的 2/3 倍,一般认为其特征周期
    与水平向相同。这种统计平均反应谱实际上包含了许多随机因素,三方向反应谱
    之间的关系非常复杂,故仅用一条平均谱来代表是不能反映其真实性态的。本文
    基于对大量美国西部地震记录的研究,分析了三方向反应谱在特征周期、谱值比
    例、地震影响系数最大值和动力系数最大值等参数方面的差异,以及这些参数与
    场地类别、震级和震中距的关系,对规范反应谱的改进提出一些参考的依据,使
    结构抗震设计结果更趋于合理。
    最后介绍了一种基于随机过程理论的强震地面运动模拟方法-随机方法,分
    析表明该方法模拟的地震动加速度时程是合理的,可以应用于实际结构的抗震设
    计。
The design response spectra in current Chinese seismic design code are defined
    to represent an statistically average result of many horizontal ground acceleration
    response spectra, therefore the characteristic periods of two horizontal ground
    acceleration response spectra are assumed to be equal, the value is determined by site
    category and seismic environment grouping, and the maximum horizontal seismic
    effect coefficient is determined by design intensity indicated in seismic zonation.
    Whereas the corresponding vertical design response spectra are usually assumed that
    the horizontal design response spectra times 2/3,the characteristic period of vertical
    design response spectra is taken same as that of horizontal component. However
    actually an statistically average ground acceleration response spectra involve a set of
    random factors, the relation among three components of the ground motion are
    significantly complex, therefore the real state of three components cannot be
    reasonably well represented by only one direction design response spectra. Based on
    abundant acceleration records in western America, a study on difference among three
    components is analyzed. Several parameters among three components are compared
    including characteristic period, ratio of vertical ground acceleration response spectra
    to the corresponding horizontal component, maximum seismic effect coefficient and
    dynamic coefficient. In addition, effects of several factors such as seismic
    magnitude,epicentral distance and local site conditions on these parameters are
    discussed. Some conclusions are proposed to be used in modification of current
    design response spectra. The results would be a means to improve seismic design of
    structure.
     Moreover, a stochastic method is introduced for simulating strong ground motion.
    This method is based on the random process theory. Results of analyses indicate that
    artificial acceleration time history obtained by stochastic method are adapted to be
    used in engineering practice.
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