Material nonlinear analyses of RC(Reinforced Concrete) beams considering the tension stiffening effect and bond-slip have been conducted. Instead of taking the sophisticated layer approach which has some limitations in application to the large structure with many degrees of freedom, the moment-curvature relationships of RC sections previously constructed through the section analysis have been used.
To reduce the numerical instability according to the used finite element mesh size, a relation simulating the tension stiffening effect has been used. In addition, to describe the bond-slip behavior in beam element in which the structural response is represented by two nodes at both ends, governing equations have been derived through the equilibrium at each node of element and the compatibility conditions between steel and concrete. Moreover, the developed algorithm has been reflected into the moment-curvature relationship of RC section.
Besides, the plastic hinge length has been taken into consideration with the purpose of removing the imprecision in calculation of ultimate resisting capacity. Finally, correlation studies between analytical and experimental results have been conducted with the objective to establish the validity of the proposed algorithms.
