It is, therefore, advisable to take advantage of the strain-hardening behavior of steel to improve the numerical stability of the solution. 2.8a leads to numerical convergence problems near the ultimate member strength. In this case the use of the elastic-perfectly plastic model in Fig. Yielding is accompanied by a sudden increase in the deformation of the member. 2-The behavior of RC members is greatly affected by the yielding of reinforcing steel when the structure is subjected to monotonic bending moments. The reasons for this approximation are: 1-The computational convenience of the model. Linear elastic, linear strain hardening steel stress-strain relation In this study the reinforcing steel is modeled as a linear elastic, linear strain hardening material with yield stress y σ, as shown in Fig.
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