Effect of Spatial and Directional Variability of Seismic Ground Motion on the Response of Structures

结构抗震分析与设计 需要可靠的估计地面震动预计在 绝佳的价钱 目前对这些地震的评价程序 地震动特性往往是经验性的， 仅限于特定地震的估计， 他们开发的网站。 这些分析的结果 因此可能不适合一般的地震反应 结构分析。 这项研究计划的任务是建立可靠的 估计的描述参数，影响 地震运动在一个网站。 有记录的地震 SMART-1（台湾强震阵列-1）的数据和新的 开发了将运动分解为 主波分量用于此目的。 分析 的主要波的特点在现场的一些 地震提供了一个基础，以评估一般 地震波随机特性的表达式 运动（功率和交叉谱密度的运动， 三个正交方向，它们的旋转分量， 空间变异性）。 衰减的发展 运动的随机描述 与地震和场地特征的关系正在探讨中。

The analysis and design of structures for earthquake resistance requires reliable estimates of the ground shaking expected at the site. Current procedures for the evaluation of these seismic ground motion characteristics tend to be empirical and result in estimates that are restricted to the particular earthquake and site for which they were developed. The results of such analyses therefore may not be suitable for general seismic response analyses of structures. This research program addresses the task of establishing reliable estimates for the description parameters that influence the seismic motions at a site. The multitude of recorded earthquake data at SMART-1 (Strong Motion Array in Taiwan-1) and the newly developed techniques for decomposing the motions into their dominant wave components is used for this purpose. The analysis of the dominant wave characteristics at the site for a number of earthquakes provides a basis with which to evaluate general expressions for the stochastic characteristics of the seismic motions (power and cross spectral densities of the motions in three orthogonal directions, their rotational components and their spatial variability). The development of attenuation equations that relate the stochastic descriptions of the motions with the earthquake and site characteristics is being explored.