NON-PROPORTIONAL DAMPING EFFECT ON TIMBER STRUCTURE WITH STIFFNESS AND VISCOUS ECCENTRICITY

Abstract

Application of passive dampers to timber structures is increasing with the aim of reducing seismic response including translation and torsion. The structure in such a case possesses the so-called non-proportional damping. In this paper, new system identification method considering non-proportional damping is proposed. Modal shapes including phase differences of each point are evaluated using special technique, which makes real-valued expression possible. Accuracy of the method is confirmed by comparison with shaking table test. It showed close agreement.