| 地震动随机场变界展开法 |
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| 引用本文： | 刘天云,刘光廷.地震动随机场变界展开法[J].清华大学学报(自然科学版),1999,39(11):1. |
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| 作者姓名： | 刘天云 刘光廷 |
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| 作者单位： | 清华大学,水利水电工程系,北京,100084 |
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| 基金项目： | 国家教委博士后重点科研基金 |
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| 摘 要： | 针对地震动随机场特性进行解析展开，提出一种有效的变界展开方法，同时将频率相关的非线性方程精确线性化，且只须一次分解给定频率相应空间随机场即可直接进行整个频域随机场分析的效果。计算结果表明，该方法不但计算简单，而且具有截断误差小的特点，通常取解析展开的前五项即可满足工程需要。该方法非常适应大型结构多点地震动随机输入分析。
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| 关 键 词： | 时-空随机场 地震动 解析展开 |
| 修稿时间： | 1998-12-21 |
Varying-bounds expansion of seismic random fields |
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| LIU Tianyun,LIU Guangting.Varying-bounds expansion of seismic random fields[J].Journal of Tsinghua University(Science and Technology),1999,39(11):1. |
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| Authors: | LIU Tianyun LIU Guangting |
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| Abstract: | A new varying bounds method was proposed in the present study for expansion of seismic random fields. The seismic ground was specified stochastically in terms of a local power spectral density function and an orthotropic inherence function which decays exponentially with the line of the excitation frequency and the separation distance. The nonlinear equations are transferred into linear ones. The numerical results elucidate the effects of the present approach. This approach is well suited to analyze the structural stochastic responses. |
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