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SUMMARY A proposal is presented for estimating the maximum absolute acceleration at different levels in a multi-degree of freedom systems. This is done in terms of the modal shape and the acceleration response spectrum, which traditionally is part of seismic regulations. The proposal is based on the combination of a modal response with the excitement signal when they both are considered as harmonics. The present proposal has an ~7% average error when it is compared with exact solutions calculated using time series. This error contrasts with 20% and greater average errors found in other three analyzed proposals presented in three seismic codes.

EVALUACIÓN APROXIMADA DE LA ACELERACIÓN ABSOLUTA PARA UNA FORMA MODAL EN SISTEMAS DE MÚLTIPLES GRADOS DE LIBERTAD