Power Spectra Based Seismic Structural Response Using Cross CorrelatedFree-Field Earthquake Motions

摘要

This study attempts to re-examine the significance of the cross-correlation that may exist in the free fieldrncomponents of an earthquake event, and its subsequent contribution to a system response. Specifically, using asrnpoint of reference the three acceleration components of the Kobe earthquake at a recording station, strong crosscorrelationsrnare demonstrated. Further, based on a developed theoretical/computational model that allows for directrntransfering of a free-field stochastic process to a multi-DOF system, the contribution of the cross terms in the freefieldrnearthquake is assessed. Lastly, some discussion on the development of a cross-correlated free field stochasticrnprocess that may represent the family of earthquakes in the locality on the basis of observed data is presented.