Evaluation of the Seismic Strengthening for R/C Frame Building with Soft First Story Using Hysteretic Steel Damper Subjected to Strong Earthquake (original) (raw)

Abstract

ABSTRACT This paper investigate the response of r/c frame building with soft first story. The soft first story is characterized by the absence of infill wall on the ground floor. In order to enhance the seismic response of r/c frame building, the yielding damper is incorporated into building on the first story. The finite element method is employed to simulate the response of the frame building subjected to selected strong earthquakes using non-linear time history analysis. The effect of masonry infill on building responses are taken into account using equivalent three-strut model, and the presence of the opening in reduction both stiffness and strength of the masonry infill are also considered. In the finite element modeling, the simplified tri-linear model of stress–strain relationship are used for equivalent strut material, while hysteretic behavior of steel yielding damper is approximated by bilinear model. In addition, the inelastic behavior of beam and column elements with rigid end zone is also adopted. The responses quantities are obtained from nonlinear analysis to be used for assessment the seismic performance of the building under consideration. It also investigates the damage level of the building structure using damage index based on Park and Ang damage model. Finally, the seismic performance of the infilled frame building with and without steel yielding steel dampers in placed are discussed and compared.

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