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Proceedings Paper

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

Paper Details

Date Published: 15 March 2006
PDF: 9 pages
Proc. SPIE 6169, Smart Structures and Materials 2006: Damping and Isolation, 61691B (15 March 2006); doi: 10.1117/12.658420
Show Author Affiliations
Tatsuya Azuhata, National Institute for Land and Infrastructure Management (Japan)
Mitsumasa Midorikawa, Hokkaido Univ. (Japan)
Tadashi Ishihara, National Institute for Land and Infrastructure Management (Japan)


Published in SPIE Proceedings Vol. 6169:
Smart Structures and Materials 2006: Damping and Isolation
William W. Clark; Mehdi Ahmadian; Arnold Lumsdaine, Editor(s)

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