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This paper proposes a new equation for the effective length factor (k-factor) for reinforced concrete columns in braced frames. The new formula is valid both for normal and high strength concrete. The equation was obtained from a sensitivity analysis performed on a 2-D nonlinear finite element numerical model that takes into account the inelastic behavior of the concrete columns (cracking, yielding, and second order effects). The numerical model was calibrated with 44 experimental testsdoi:10.1061/(asce)0733-9445(2009)135:9(1034) fatcat:uekcqunrf5ggzbfkhqukv2zzei