基于Matlab的人工地震动合成及校正

Artificial Ground Motion Synthesis and Correction Based on Matlab

选取适当的地震波是进行地震响应分析的前提。但由于实际地震记录所处场地环境及数量有限,因而使用时合成人工地震动非常必要。以《水电工程水工建筑物抗震设计规范》中的标准设计反应谱为目标谱,采用三角级数法合成初始人工地震动,并对其功率谱及幅值谱校正;然后使用最小二乘法消除零线漂移完成初始人工地震动校正;最后,基于Matlab平台实现了人工地震动的可视化,计算结果拟合精度较高,从而为工程抗震提供合理的地震动输入。

Reasonable selection of seismic waves is a prerequisite for seismic response analysis. Since the number of actual seismic records and its corresponding sites are limited, it is very necessary to synthesize artificial ground motion in practice. The standard design response spectrum of the Code for seismic design of hydraulic structures of hydropower project is used as the target spectrum. The initial artificial ground motion is synthesized by the triangular series method. And an update of the initial artificial ground motion is accomplished by correcting the power spectrum and amplitude spectrum. Then the least squares method is adopted to eliminate the zero line drift. Finally, the visual work of artificial ground motion is achieved based on Matlab. The calculation results show that the fitting precision is higher. Therefore, a reasonable ground motion input can be provided for earthquake engineering.