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A vector-valued ground motion intensity measure consisting of spectral acceleration and epsilon

机译：由频谱加速度和ε组成的矢量值地面运动强度测度

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摘要

The 'strength' of an earthquake ground motion is often quantified by an Intensity Measure (IM), such as peak ground acceleration or spectral acceleration at a given period. This IM is used to predict the response of a structure. In this paper an intensity measure consisting of two parameters, spectral acceleration and epsilon, is considered. The IM is termed a vector-valued IM, as opposed to the single parameter, or scalar, IMs that are traditionally used. Epsilon (defined as a measure of the difference between the spectral acceleration of a record and the mean of a ground motion prediction equation at the given period) is found to have significant ability to predict structural response. It is shown that epsilon is an indicator of spectral shape, explaining why it is related to structural response. By incorporating this vector-valued IM with a vector-valued ground motion hazard, we can predict the mean annual frequency of exceeding a given value of maximum interstory drift ratio, or other such response measure. It is shown that neglecting the effect of epsilon when computing this drift hazard curve leads to conservative estimates of the response of the structure. These observations should perhaps affect record selection in the future.
机译：地震地面运动的“强度”通常通过强度测量（IM）来量化，例如在给定时间段内的峰值地面加速度或频谱加速度。此IM用于预测结构的响应。在本文中，考虑了由两个参数光谱加速和ε组成的强度测量。与传统上使用的单个参数或标量IM相比，IM被称为向量值IM。发现Epsilon（定义为记录的频谱加速度与给定周期内地面运动预测方程的平均值之间的差异的量度）具有显着的预测结构响应的能力。结果表明，ε是光谱形状的指标，解释了为什么它与结构响应有关。通过将此矢量值IM与矢量值地面运动危害合并在一起，我们可以预测超过给定值的最大层间漂移率或其他此类响应度量的平均年频率。结果表明，在计算该漂移危险曲线时忽略ε的影响会导致对结构响应的保守估计。这些观察结果也许会影响将来的记录选择。

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