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Steel and Composite Structures
  Volume 14, Number 6, June 2013 , pages 621-636

Response modification factor of dual moment-resistant frame with buckling restrained brace (BRB)
Gholamreza Abdollahzadeh and Mohammadreza Banihashemi

    Response modification factor is one of the seismic design parameters to consider nonlinear performance of building structures during strong earthquake, in conformity with the point that many seismic design codes led to reduce the loads. In the present paper it\'s tried to evaluate the response modification factors of dual moment resistant frame with buckling restrained braced (BRB). Since, the response modification factor depends on ductility and overstrength; the nonlinear static analysis, nonlinear dynamic analysis and linear dynamic analysis have been done on building models including multi-floors and different brace configurations (chevron V, invert V, diagonal and X bracing). The response modification factor for each of the BRBF dual systems has been determined separately, and the tentative value of 10.47 has been suggested for allowable stress design method. It is also included that the ductility, overstrength and response modification factors for all of the models were decreased when the height of the building was increased.
Key Words
    R-factor; ductility and overstrength factors; dual moment resistant frame with BRB
Gholamreza Abdollahzadeh, Mohammadreza Banihashemi: Faculty of Civil Engineering, Babol University of Technology, Babol, Iran

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