Seismic response reduction of buildings by rocking structural systems with adaptive dampers

Tatsuya Azuhata; Mitsumasa Midorikawa; Tadashi Ishihara

doi:10.1117/12.658420

15 March 2006 Seismic response reduction of buildings by rocking structural systems with adaptive dampers

Tatsuya Azuhata, Mitsumasa Midorikawa, Tadashi Ishihara

Proceedings Volume 6169, Smart Structures and Materials 2006: Damping and Isolation; 61691B (2006) https://doi.org/10.1117/12.658420
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

To reduce seismic responses of steel building structures, we are now developing the base plate yielding system (BPY system). This system has base plates yielding in the uplift direction at each column base. When the base plates yield, the structure can cause rocking. As some researches have pointed out, rocking effects can reduce seismic damage of buildings under some conditions. In this paper, to improve the seismic performance of the BPY system, conventional or adaptive viscous dampers are attached at each column base besides yielding base plates. Using the adaptive dampers, we can change the damping coefficient according to a sign of vertical velocity at each uplifting part. When a building starts uplifting, and when the sign of vertical velocity is plus, we should set moderate damping coefficient to the damping devices so that they do not restrain a building from uplifting. When the building is landing, and when the sign of the vertical velocity is minus, we can set larger damping coefficient to them so that they can dissipate seismic energy as much as possible. To examine the effect of these additional dampers, numerical tests are carried out. A building structure is replaced by a one-mass system with a footing beam. The height and width of the one-mass system are 30 m and 8 m respectively. The 1995 Kobe NS and an artificial ground motion are used for seismic analyses. It is concluded that the seismic responses of the BPY system can be reduced using the adaptive dampers effectively.

Citation Download Citation

Tatsuya Azuhata, Mitsumasa Midorikawa, and Tadashi Ishihara "Seismic response reduction of buildings by rocking structural systems with adaptive dampers", Proc. SPIE 6169, Smart Structures and Materials 2006: Damping and Isolation, 61691B (15 March 2006); https://doi.org/10.1117/12.658420

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