Spectral shape, epsilon and record selection
Spectral shape, epsilon and record selection
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DOI：
10.1002/eqe.571
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发表时间：
2006-07-25
影响因子：
4.5
通讯作者：
Cornell, C. Allin
中科院分区：
文献类型：
--
作者：
Baker, Jack W.;Cornell, C. Allin
地震地面运动的选择被认为是准确地估计在指定的地面运动强度的结构的响应的目标，如在结构的第一模式周期，Sa（T-1）的频谱加速度测量。考虑了地震动的大小、距离和振幅值。首先，可以看出，基于e值选择记录比基于幅度和距离选择记录更有效。其次，讨论了一种方法，用于寻找地面运动的条件反应谱，给定的水平Sa（T-1）和其相关的平均值（解体为基础）的因果幅度，距离和α值。然后，可以选择记录以匹配该目标频谱的平均值，并且实现与基于SNR选择记录时相同的益处。这种平均目标谱不同于统一的危害谱，有人认为，这种新的谱是一个更合适的目标记录选择。当适当选择记录的基础上，无论是频谱形状或e，减少偏差和方差的结构响应估计是可比的减少，通过使用地震烈度的向量值的措施。版权所有（C）2006约翰威利父子有限公司
Selection of earthquake ground motions is considered with the goal of accurately estimating the response of a structure at a specified ground motion intensity, as measured by spectral acceleration at the first-mode period of the structure, Sa(T-1). Consideration is given to the magnitude, distance and epsilon (epsilon) values of ground motions. First, it is seen that selecting records based on their e values is more effective than selecting records based on magnitude and distance. Second, a method is discussed for finding the conditional response spectrum of a ground motion, given a level of Sa(T-1) and its associated mean (disaggregation-based) causal magnitude, distance and epsilon value. Records can then be selected to match the mean of this target spectrum, and the same benefits are achieved as when records are selected based on epsilon. This mean target spectrum differs from a Uniform Hazard Spectrum, and it is argued that this new spectrum is a more appropriate target for record selection. When properly selecting records based on either spectral shape or e, the reductions in bias and variance of resulting structural response estimates are comparable to the reductions achieved by using a vector-valued measure of earthquake intensity. Copyright (C) 2006 John Wiley & Sons, Ltd.