NON-LINEAR DYNAMIC RESPONSE CHARACTERISTIC OF SINGLE-DAMPED OUTRIGGER SYSTEMS WITH OIL DAMPERS OR ELASTO-PLASTIC DAMPERS CONSIDERING DESIGN EARTHQUAKE LEVELS

Abstract

The damped outrigger system is in widespread in seismic area as a damping modification system. However, the relationships between the exact damping performance and its seismic response reduction effect has not been deeply investigated yet. This paper investigated the non-linear dynamic response characteristic of single-damped outrigger systems with oil dampers or elasto-plastic dampers considering design earthquake levels. The optimal damper design equations to maximize 1st mode damping ratio were proposed, and validated through the application example of a Japanese super-tall building, and a design algorithm to translate the optimized single damped outrigger to quad damped outrigger systems is proposed.