【摘要】 在进行结构非一致地震激励下的响应分析时,往往需要采用人工合成的多点地震动。首先讲述了利用谱表现合成地震动的方法,并且在合成地震动的过程中对模型的视波速公式进行了修正,合成了人工地震动加速度时程。对于人工合成的地震动加速度时程,采用直接积分的方法获取其位移时程,由于长周期分量的影响,发生了严重的积分漂移现象。针对此种情况,先运用Butterworth双向滤波分别对合成加速度数据进行滤波和零位调整,保证积分后结果没有零点平移。从直接积分法和滤波后的对比分析结果可以看出,本文提出的方法可以很好地消除积分漂移现象,具有良好的精度和适用性。更多还原

【Abstract】 During the analysis of structure under inconsistent seismic excitations,the artificially synthetic seismic excitations are often adopted.This paper first introduces the spectral representation method to synthesize the artificial ground motion,and the wave velocity formula is modified during the synthesis.The artificial earthquake acceleration time history is gained.In the process of getting the displacement of time history,the results show that after twice direct integration of the acceleration time history,the serious drift occurs.So the Butterworth filtering algorithm is adopted to deal with the acceleration time history first and then the integration is adopted.After the procedures above twice,the displacement time history can be gained.From the results compaction between the direct integration and the method put forward by this paper,the integration drift can be eliminated with satisfaction.The filtering algorithm method bears fine accuracy and applicability.更多还原