CUMBIA - a set matlab/octave codes for the analysis of reinforced concrete members

cite as: Montejo, L. A., & Kowalsky, M. J. (2007). CUMBIA—Set of codes for the analysis of reinforced concrete members. CFL technical rep. no. IS-07, 1.

Calculation of Mn was revised (there was a problem for some sections where Mn was not calculated in v0.1)

Calculation of Mi(k) in the axial-moment interaction was revised (there was a problem for some sections where Mi(k) was not calculated in v0.1)

Axial force values for the calculation of the axial-moment interaction curve were changed (depending on the section details, for compression axial load ratios greater than 70% the algorithm was not converging)

Correction of concrete layers areas because of the presence of reinforcing bars in the layer was revised.

The estimation of first yield curvature now includes the compression strain in the concrete (1.8*fpc/Ec), before it only checked for tensile strain in the rebar (fy/Es) “breaks” outside a loop were replaced with “returns”