Karafan Journal

Karafan Journal

Performance Evaluation of Vertical Elliptical Tubular Damper on Improving the Behaviour of Chevron-braced Steel Frames

Document Type : Original Article

Authors
Mohsen Khatibinia 1
Safarkhan Hassani 2
Shima Bijari 3
Sobhan Rostami 4
1 Associate Professor, Department of Civil Engineering, Engineering Faculty, University of Birjand, Birjand, Iran.
2 MSc Student, Department of Civil Engineering, Engineering Faculty, University of Birjand, Birjand, Iran.
3 Assistant Professor, Department of Civil Engineering, Engineering Faculty, University of Birjand, Birjand, Iran.
4 Assistant Professor, Department of Civil Engineering, National University of Skills (NUS), Tehran, Iran.
10.48301/kssa.2024.460247.2922
Abstract
The buckling of braces in an eccentrically braced system is a major weakness during earthquakes. To overcome this weakness, one of the proposed solutions is the use of metallic yielding dampers at the connection of the brace to the flange beam of the story so that the input energy caused by seismic excitations is dissipated by dampers and the main members of this system (beams, columns, and braces) remain in an elastic state. In addition, construction, installation, and repair of tubular dampers after an earthquake excitation is very easy and low-cost. In this study, the performance of the vertical elliptical tubular damper (VETD) in the chevron braced frame was investigated to dissipate the input energy under cyclic loading and prevent the buckling of braces, and its performance was compared with a vertical tubular damper (VTD) with a circular cross-section. First, the validation of modeling VTD in the chevron-braced frame was implemented in Abaqus finite element software. Then, five VETD samples with the same weight as the VTD samples were selected, and the performance comparison of the sample dampers in the chevron-braced frame under the cyclic loading protocol was studied. The results showed that VETDs have more ductility and energy dissipation than VTDs. The results indicated a 6 to 69% increment in the ductility of frames equipped with VETDs compared to that of VTDs. Furthermore, the comparison of the depreciated energy of dampers indicated that VETDs increased by 6 to 22% in comparison with VTDs.
Keywords
Steel Frames
Chevron Bracing
Metallic Yielding Dampers
Vertical Elliptical Tubular Damper
Ductility
Depreciated Energy
Subjects
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Karafan Journal
Volume 21, Issue 3
Technical and Engineering
Autumn 2024
Pages 395-414

  • Receive Date 29 May 2024
  • Revise Date 19 July 2024
  • Accept Date 11 September 2024