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Study on characteristics of asymmetry of effective amplitude of ground motion

MENG Fanchao1,YUAN Xiaoming2,SUN Rui2 (1.Institute of Disaster Prevention,Sanhe 065201,China; 2.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)  
Using the records of 287 earthquakes,the magnitudes of which are greater than 5,the asymmetrical characteristics of effective amplitudes of ground motion are investigated.Using asymmetry ratios of effective amplitudes and effective cyclic numbers,the asymmetry of ground motions is described with regular results are regular,and its calculation formula is presented.The statistic results indicate that the asymmetrical characteristics of the effective amplitudes and effective cyclic number are obvious.The averages of asymmetry ratios of effective amplitudes are not influenced by magnitudes,but increase with the increase of cut-off ratios.The averages of asymmetry ratios are between 1.07~1.20 when the cut-off ratios are lower than 1/3,the cut-off ratios are higher than between 1.13~1.96 when the cut-off ratio are higher than 1/3.The averages of asymmetry ratios of effective cyclic number are not influenced by magnitudes,but increase with the increase of cut-off ratios.The averages of asymmetry ratios are between 1.04~1.31,when the cut-off ratios are lower than 1/3;the averages of asymmetry rations are between 1.22~1.80,when the cut-off ratios are higher than 1/3.
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