Classification method for long period ground motions based on component decomposition with HHT
ZHAO Chenxiao1，LI Yingmin1,2，TAN Qian1
1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. MOE Key Lab of New Technology for Construction of Cities in Mountain Area, Chongqing 400045, China
Long period component is a decisive one to reflect basic characteristics of long period ground motions (LPGMs). Based on Hilbert-Huang Transformation (HHT), in ground motion’s acceleration response spectrum, intrinsic mode functions (IMFs) with average period 2.0s and residual components were extracted to reconstruct a signal which was taken as the long period component of the original ground motion after baseline correction. The rationality of classifying a long period component was verified using the correlation analysis between the long period component and the original ground motion and effects of the long period component on structural responses of a super high-rise building. The long period ground motions indicator (LPGI) based on long period component characteristics was proposed, it was shown that the ground motion is LPGM when its .The time interval needed for the area between the normalized Hilbert accumulated energy curve of a long period component and time axis to increase from 5% to 95% was proposed to represent pulse characteristics of LPGM. Thus the two kinds of special LPGMs including far-field LPGMs and near-field ones were distinguished. The results provided a better method and a parametric indicator for distinguishing LPGMs.
赵晨晓1，李英民1,2,，谭潜1. 基于HHT地震动分量分离的长周期地震动界定方法[J]. 振动与冲击, 2018, 37(7): 164-171.
ZHAO Chenxiao1，LI Yingmin1,2，TAN Qian1. Classification method for long period ground motions based on component decomposition with HHT. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(7): 164-171.
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