利用数字化速度记录仿真加速度时程与合成场地设计地震波

研究利用测震台网数字化宽频带速度型记录仿真加速度时程,并通过提取其相位信息和拟合场地设计反应谱(目标谱)的方法来获得场地设计地震波的有关技术途径与应用实例,所提供的具体算式采用便于编程和利用快速傅氏变换(FFT)技术进行计算的离散化傅氏正逆变换的复数表达式。有关研究结果可拓宽现有地震观测资料的使用价值,减少地面运动模拟中人造地震波与原始地震记录存在的差异,并可使所合成的设计地震波满足给定的目标谱,且能较好地反映其非平稳性特征,因此在地震工程中具有实际的应用价值。

Using digital velocity records simulate acceleration time history and synthesize site design earthquake

In this paper, a method for simulating acceleration records from the digital broad-band velocity type records of seismograph network is studied. Through extracting phase information and generating the site design response spectrum, the concerned technique approach for site design earthquake is obtained. An earthquake record was taken as an application example for analysis and processing. FFT technique is applied in the calculation. The result can generalize the application of velocity type records of the digital seismograph network, and can significantly reduce the difference between the generation of artificial seismic wave and records from a real seismic wave. In addition, the simulated seismic wave can be designed to satisfy given target spectrum and reflect its instability both on time and frequency domain. Therefore, it provides a practical and valuable application in the earthquake engineering.