【摘要】 在标准化结构反应谱时,需要准确地确定地面地震动峰值。而在地震期间,测量地面运动时采集到的地震动加速度时程数据由于种种原因存在基线漂移问题,导致所测数据不能真实反映地面运动,由此难以确定真实地面运动峰值。通过对地震动加速度数据拟合,根据拟合后的数据计算地震速度及位移,并将计算结果分别与利用已有基线修正方法求得的速度及位移进行对比,从而确定最佳拟合次数,消除基线漂移造成影响。研究结果表明,经12次拟合修正地震动加速度求得的地震动位移峰值可用于相对位移反应谱标准化。更多还原

【Abstract】 Standardizing response spectra of structures needs accurate peak values of ground motions.For some reasons,baseline drift exists in the time histories of earthquake acceleration records.This phenomenon results in those records cannot reflect the real ground motions.As a result,it is difficult to determine the accurate peak ground motion values.In this paper,the original acceleration records of strong ground motions are fitted and the PGVs and PGDs are calculated based on the fitted acceleration data,and then they are compared with the recorded PGVs and PGVs.Finally,the optimal fitting number is determined to eliminate the influence caused by the baseline drift.The results show that when the fitting number is 12,the resulted PGD values can be used in the standardization of relative displacement response spectra.更多还原