Evaluation of Response Reduction Factor in Non-Stationary Elastic Response

Abstract

This paper presents the revised response reduction factor with higher accuracy, which is modified from the past proposal. In the modification, two phenomena are considered. One is the influence of the asymmetry of response of one cycle just before the maximum response on the calculation of the equivalent damping factor. The other is the influence of the change of the period due to the damping. The paper also proposes simplified formula for the response reduction factor. Finally, the consistency of the modified formula and the simplified formula with the time history analytical results is investigated, which proves the excellent compatibility.