Abstract
The presented research studies the seismic response of a new braced steel frame type and a new design philosophy that will focus on minimizing damage to the essential structural members and ensuring satisfactory post-earthquake performance of steel buildings under service loads with minimal rehabilitation costs. The proposed frame type is composed of beams and columns with rigid connections, chevron braces and a conventional energy-dissipating member called the shear element connected between the braces and the beam. Nonlinear static pushover and seismic analyses are conducted to assess the performance of the proposed efficient energy dissipating steel frame (EEDBF) compared to the conventional concentrically braced frames (CBFs) and moment resisting frames (MRFs). The results have revealed that the EEDBF has a more stable force-lateral deformation hysteresis loop compared to CBF. The energy dissipation is comparable with MRF. The story drift of the EEDBF at medium to large intensity ground motions is smaller than that of both the CBF and MRF.
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