The velocity pulse in near‐fault ground motions has been used as a key characteristic of damaging ground motions. Characterization of the velocity pulse involves three parameters: presence of the pulse, period of the pulse, and amplitude of the pulse. The basic concept behind the velocity pulse is that a large amount of seismic energy is packed into a short time, leading to larger demands on the structure. An intensity measure for near‐fault ground motions, which is a direct measure of the amount of energy arriving in short time, called instantaneous power (IP (⁠T1⁠)), is defined as the maximum power of the bandpass‐filtered velocity time series measured over a time interval of 0.5T1⁠, in which T1 is the fundamental period of the structure. The records are bandpass filtered in the period band (⁠0.2T1−3T1⁠) to remove the frequencies that are not expected to excite the structure. Zengin and Abrahamson (2020) showed that the drift is better correlated with the IP (⁠T1⁠) than with the velocity pulse parameters for records scaled to the same spectral acceleration at T1⁠. A conditional ground‐motion model (GMM) for the IP is developed based on the 5%‐damped spectral acceleration at T1⁠, the earthquake magnitude, and the rupture distance. This conditional GMM can be used for record selection for near‐fault ground motions that captures the key features of velocity pulses and can lead to a better representation of the median and variability of the maximum interstory drift. The conditional GMM can also be used in a vector hazard analysis for spectral acceleration (⁠T1⁠) and IP (⁠T1⁠) that can be used for more accurate estimation of drift hazard and seismic risk.

中文翻译：

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基于瞬时功率的近断层地震动破坏特征的条件地震动模型

近断层地震动中的速度脉冲已被用作破坏性地震动的关键特征。速度脉冲的表征涉及三个参数：脉冲的存在，脉冲的周期和脉冲的幅度。速度脉冲背后的基本概念是在短时间内会聚集大量的地震能量，从而对结构提出了更高的要求。近断层地面运动的强度度量，是对短时间内到达的能量的直接度量，称为瞬时功率（IP（⁠T1⁠）），被定义为带通滤波速度时间的最大功率。在0.5T1⁠的时间间隔内测得的序列，其中T1是结构的基本周期。记录在周期带（⁠0。2T1−3T1⁠）移除预期不会激发结构的频率。Zengin和Abrahamson（2020）指出，与记录缩放到T1？的相同光谱加速度的记录相比，漂移与IP（？T1？）的相关性更好，与与速度脉冲参数的相关性更好。基于T1处衰减5％的频谱加速度，地震震级和破裂距离，开发了IP的条件地面运动模型（GMM）。这种有条件的GMM可用于记录近断层地面运动，从而捕获速度脉冲的关键特征，并可以更好地表示最大层间漂移的中位数和变化。