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Statistical analysis of peaks and directivity of earthquake ground motion
Author(s) -
Ansary Mehedi A.,
Yamazaki Fumio,
Katayama Tsuneo
Publication year - 1995
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290241108
Subject(s) - acceleration , peak ground acceleration , spectral acceleration , directivity , displacement (psychology) , geodesy , response spectrum , ground motion , attenuation , geology , transverse plane , motion (physics) , seismology , physics , optics , engineering , structural engineering , classical mechanics , telecommunications , psychology , antenna (radio) , psychotherapist
Conversion factors are useful for attenuation and damage estimation relationships. These factors among different definitions of peaks (i.e. larger, average and resultant) for peak ground motion indices and acceleration response spectrum were investigated. A large number of horizontal acceleration records recorded at 76 free‐field sites of the Japan Meteorological Agency were used in this study. Two orthogonal horizontal components were combined in the time domain to get the maximum resultant peak ground motion indices and acceleration response spectrum in the horizontal plane. From the analysis, the means of the larger/resultant ratio were found to be 0·934 for acceleration, 0·926 for velocity, and 0·913 for displacement. A similar decreasing trend was observed for the means of the average/resultant ratio of the ground motion indices and acceleration response spectrum. The directivity of peak ground motion indices was also examined. It was found that the peak ground motion is more likely to occur in the transverse direction than in other directions. This trend is more prominent in the long‐period contents of ground motion.