|
Title |
Development of Self-centering Viscous Damper System for Seismic Retrofit of Ordinary Concentrically Braced Frame
|
|
Authors |
김도연(Do Yeon Kim) ; 최혁순(Hyuck Soon Choi) ; 강주형(Joohyung Kang) ; 이용선(Yongsun Lee) |
|
DOI |
https://doi.org/10.11112/jksmi.2023.27.6.70 |
|
Keywords |
자가복원형 점성감쇠기 시스템; 보통중심가새골조; 내진보강 Self-centering viscous damper system; Ordinary concentrically braced frame; Seismic retrofit |
|
Abstract |
The ordinary concentrically braced frame has an advantage of having simple design procedure. For this reason, it has been widely used for the small-sized frame structures subject to moderate or lower magnitude earthquake, even though its seismic performance against the earthquake load is not much effective compared to that of other frame systems. To enhance seismic performance of the ordinary concentrically braced frame where the bracing has a weakness for compressive behavior under lateral earthquake, seismic retrofitting by viscous damper has been commonly introduced. However, the viscous damper, itself, generally does not have stiffness for restoring the structure to the original position. This may cause residual displacement to the structure. In this paper, a self-centering viscous damper system in which upper and lower beams having flexural rigidity play a role as a nonlinear-elastic spring, restoring the spring-damper system subject to external displacement history to its original location, is developed. The numerical analysis for a simplified frame structure shows how including the developed self-centering viscous damper system leads to an enhanced seismic performance of the frame structure through energy dissipation during earthquake excitation.
|