Study on Stroke Control Strategy of Seismic Control Structure Utilizing Large-Weight Sub-System as Dynamic Mass Damper

Abstract

This paper proposes a stroke control strategy for seismic control of a structure that includes large-weight sub-systems. Although it is possible to provide a large mass ratio by utilizing a part of the structure's weight as a dynamic mass damper, there is a problem to secure enough stroke length of sub-system in actual design. This paper first defines optimum parameter settings of a sub-system that minimizes the response of a main-system based on random vibration theory using a 2DOF analytical model. After several examinations of the influence of a sub-system's parameter on the response reduction effect, a relational expression that connects sub-system's parameters and stroke is derived.Then the setting procedure based on the response spectrum is presented. By applying the proposed strategy, rational parameter settings of a sub-system matched with the design objective stroke can be obtained without performing any time history analyses.

Control effect of large tuned mass damper used for seismic retrofitting of existing high‐rise building

“…Although these formulas were derived based on the main structure with a damping ratio of zero, they also give good settings with the condition that the damping ratio of the main structure is relatively small . In this study, a main structure damping ratio h STR of 2% was used to simulate the structural damping.…”