438 A study on applicability of dynamic damper using high damping alloy to footbridge : Effects of collision vibration at stopper on vibration control performance

Abstract

A dynamic damper using Mn-Cu alloy is proposed to reduce vertical vibration of long-span footbridges. This paper presents an analytical study for evaluating effects of collision vibration of the dynamic damper weight at the stopper on vibration control performances of the dynamic damper for the footbridge. In the analysis, seismic response analysis using 2 kinds of a non-liner dynamic damper model with collision gaps and a linear dynamic damper model without collisions are carried out. Effects of collision spring constants, coefficients of restitutions at the stopper and seismic acceleration levels on the seismic control performances of the dynamic damper are evaluated.