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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Wavelet-based generation of accelerogram-consistent, spectrum-compatible motions: New algorithms and short-period overestimation
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Wavelet-based generation of accelerogram-consistent, spectrum-compatible motions: New algorithms and short-period overestimation

机译：基于小波的Accelerogram-Conseport，频谱兼容的动作：新算法和短周期高度估计

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The use of spectrum-compatible accelerograms in seismic design of structures has lately become popular and several algorithms have been proposed to generate such accelerograms. Some of those algorithms can be used to generate accelerogram-consistent motions, i.e., the motions in which the nonstationary features of a given seed motion are replicated. In a popular algorithm of this type a recorded motion is modified via frequency-band-dependent modification factors such that it becomes compatible with a target spectrum and the nonstationary features of the original motion are preserved in the component narrow-band wave levels of the modified motion. In the present paper, the performance of this method is critically reviewed in terms of convergence rate, degree of modification of the seed motion and the quality of matching in the zero-period acceleration (ZPA) region of the target spectrum. It is observed that the first two issues can be addressed by properly taking into account the pseudo-static response of an oscillator due to a narrow-band excitation. Two new algorithms are therefore proposed, one works by computing the modification factors sequentially and the other one simultaneously. An improved matching is also attempted in the ZPA region by using a direct constrained optimization. Further, additional insight is provided with the help of numerical examples to determine whether the given combination of target spectrum and seed motion may lead to a short-period overestimation in the simulated motion.
机译：使用频谱兼容的Accelerograms在结构的地震设计中最近变得流行，并且已经提出了几种算法来产生此类加速度局。这些算法中的一些可用于生成加速度缩略图 - 一致的运动，即复制给定种子运动的非间断特征的运动。在这种类型的流行算法中，经由频带相关的修改因子修改了记录的运动，使得它与目标频谱兼容，并且在修改的组件窄带波级别中保留了原始运动的非间断特征运动。在本文中，该方法的性能在收敛速率，种子运动的修改程度和目标光谱的零周期加速度（ZPA）区域中的匹配质量方面是批评性的。据观察，由于窄带振荡，可以正确地考虑振荡器的伪静态响应来解决前两个问题。因此提出了两个新的算法，通过同时计算修改因子和另一个新算法。通过使用直接约束优化，还尝试在ZPA区域中尝试改进的匹配。此外，在数值示例的帮助下提供了额外的识别，以确定特定的目标频谱和种子运动的组合是否可能导致模拟运动中的短时间过高估计。

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