ADVANCED EQUI-LINEARIZED TECHNIQUE FOR EARTHQUAKE RESPONSE ANALYSIS OF SOFT LAYERED GROUND

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A method is developed for equi-linearized seismic response analysis of multi-layred ground including frequency dependent effect of shear modulus and damping on ground motion amplification. The frequency dependent equivalent strain in proportion to the Fourier amplitude of shear strain time history is defined for evaluation of shear modulus and damping factor depending on the frequency contents. The method is examined in the strong motion array records and minutely surveyed soil profile at array observation station located at very soft ground. Superiority of the present method to the conventional equi-linearized method is demonstrated especially in case of strong ground motion level and soft ground condition.A comprehensive Fortran program for the proposed technique was completed, which can be used under the Windows 95 system.