Ultimate load capacity of a beam
I am trying to verify the load carrying capacity of a concrete beam reinforced with only longitudinal reinforcement at the bottom. For the analysis, I used nonlinear concrete (which has Drucker-Prager strength parameters defined) and nonlinear steel (which has bilinear isotropic hardening parameters defined) available in ANSYS library. I have carried out the analysis but the results does not look right. To get the ultimate load-deflection curve, I plotted a curve of the total deformation against the force reaction and I am getting a straight line graph. I am not sure if these are the correct parameters to plot to get the curve. Please I am still learning to use ANSYS software and I would appreciate advice and help on how to solve this problem.