地震波基线漂移的处理方法

由于受到采集仪器低频噪声、环境背景信号、人为处理误差及初始加速度等的影响，由地震加速度记录积分得到的地震波位移时程曲线会出现严重的零线漂移现象．因此，在结构地震响应的时程分析中，加速度记录需要进行校正．作者在Wilson校正处理方法基础上，提出了一种新的地震波基线漂移的处理方法，改善了加速度记录的积分性质，保证了由加速度积分得到的速度和位移时程终点均为零，并保持了地震波加速度的峰值、持时、频谱等特性．通过在实际工程的应用，验证了该校正方法的合理性．

A Correction Method for Baseline Drift of Seismic Wave

The displacement curve integrated from the acceleration curve will present a serious problem of baseline drift due to the influence of low-frequency noise signal error from the seismic acquisition equipments, environmental background signal error, human error and the initial acceleration. There-fore, the acceleration record needs to be corrected so that it ean be applied accurately in time history seismic analysis of the structure. Based on the evaluation of the Wilson＇ s correction method, a new correction method is proposed to improve the integral performance of acceleration record. This new method can remove the baseline drifts of velocity and displacement curves. Moreover, the characteristics of seismic acceleration record are retained, including the acceleration peak, duration, and frequency features. Finally, a practical application is given to verify the effectiveness of the proposed method.