Improving seismic performance of framed structures with steel curved dampers

•New curved damper design was proposed to improve performance of frame structures.•Effective equation for curved damper strength evaluation was proposed.•Effect of curved damper geometries on the structural performance was investigated.•Important experimental information on the structural performanc...

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Bibliographic Details
Published in:Engineering structures 2017-01, Vol.130, p.99-111
Main Authors: Hsu, H.-L., Halim, H.
Format: Article
Language:English
Subjects:
Columns (structural)
Cyclic loads
Deformation
Deformation resistance
Ductility
Earthquake dampers
Earthquake engineering
Earthquake resistance
Earthquakes
Energy dissipation
Laser beam cutting
Materials fatigue
Plates (tectonics)
Seismic activity
Seismic design
Seismic engineering
Seismic performance
Seismic response
Semi-rigid frames
Steel
Steel curved dampers
Steel frames
Steel plates
Steel structures
Stiffness
Structural engineering
Structural steels
Structural strength
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Summary:•New curved damper design was proposed to improve performance of frame structures.•Effective equation for curved damper strength evaluation was proposed.•Effect of curved damper geometries on the structural performance was investigated.•Important experimental information on the structural performance was presented.•Significant performance enhancement was achieved when curved damper was adopted. Moment resisting frames possess significant ductility and thus are commonly used in earthquake-resistant designs. However, excessive deformation due to lower stiffness and structural strength limits the applicability of this system. Steel curved dampers are proposed in this study to improve this system’s structural performance. The curved dampers were laser-cut from steel plates with the desired geometries and placed at the beam to column regions. The damper behavior is governed by its length and angle between the two ends. A series of cyclic loading tests were performed on steel frames with various curved damper placements to evaluate the curved damper effect on the structural performance. It was found from the test results that the frame strength was higher when the damper angle was smaller. It was also observed from test result comparisons that significant improvements in strength, stiffness and energy dissipation were achieved when the proposed curved dampers were added to the moment resisting frames. Information obtained from this preliminary investigation will be used as data for comparisons in further study of dynamic behavior of multi-story framed structures.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2016.09.063