Calculation of Inter-story Stiffness and Relative Design Parameters in Frame With BRB Considering Flexural Deformation

Traditional design method of FBRB( frame with buckling-restrained braces) which only considered inter-story shear deformation,ignoring flexural deformation of FBRB,did not conform to the deformation characteristic of FBRB. For accurately calculating the inter-story lateral stiffness,the authors presented formulas to calculate inter-story stiffness of BRB and the stiffness adjusting coefficient,considering flexural deformation and basing inter-story shear deformation model. Some design parameters of BRB were discussed under considering flexural deformation,and these parameters could be used in equivalent linearization method.