近断层脉冲型地震动重要参数的识别方法

在拟合或合成近断层脉冲型地震动的研究中,速度等效脉冲中的参数需要依据实际地震动确定,因此,如何从地震动中识别这些参数就成为一个需要解决的问题.详细分析了已有脉冲周期和脉冲速度峰值的识别方法,分析结果表明这些方法均具有局限性,尤其是对于不规则地震动.提出了基于平滑后的地震动识别脉冲周期和脉冲速度峰值的方法,并验证了这种识别方法的有效性.结果表明: 提出的脉冲周期和脉冲速度峰值识别方法可以克服以往方法的局限性,可以实现脉冲周期和脉冲速度峰值识别的程序化.

Identification methods of important parameters for near-fault pulse-type ground motions

During the process of fitting or synthesizing near-fault ground motion, parameters in the equivalent velocity pulse need to be decided based on seismic records. Thus, it is a key problem on how to identify these parameters from seismic records. Pulse period and pulse peak velocity are important parameters in the equivalent velocity pulse models. In this study, various methods on identifying the parameters are reviewed. It is shown that all the existing methods have limitations, especially for the irregular seismic records. And a new method is proposed to identify the pulse period and the peak pulse velocity from the smoothed seismic records, and its validity is also verified. It's shown that the new method can overcome the limitations of the previous methods and can be used to identify the pulse period and the peak pulse velocity by program.