Techno Press

Earthquakes and Structures   Volume 10, Number 3, March 2016, pages 589-611
Seismic upgrading of structures with different retrofitting methods
Esra Mete Güneyisi and Ibrahim Azez

Abstract     [Full Text]
    This paper presents an analytical study aimed at evaluating the seismic performance of steel moment resisting frames (MRFs) retrofitted with different approaches. For this, 3, 6 and 12 storey MRFs having four equal bays of 5 m were selected as the case study models. The models were designed with lateral stiffness insufficient to satisfy code drift and hinge limitations in zones with high seismic hazard. Three different retrofit strategies including traditional diagonal bracing system and energy dissipation devices such as buckling restrained braces and viscoelastic dampers were used for seismic upgrading of the existing structures. In the nonlinear time history analysis, a set of ground motions representative of the design earthquake with 10% exceedance probability in fifty years was taken into consideration. Considering the local and global deformations, the results in terms of inter-storey drift index, global damage index, plastic hinge formations, base shear demand and roof drift time history were compared. It was observed that both buckling-restrained braces and viscoelastic dampers allowed for an efficient reduction in the demands of the upgraded frames as compared to traditional braces.
Key Words
    buckling-restrained brace; conventional brace; earthquake; viscoelastic damper; structural response; performance characteristics
Department of Civil Engineering, Gaziantep University, 27310, Gaziantep, Turkey

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