In this paper, simple equations for the required lateral load carrying capacity of reinforced concrete buildings using the equivalent linearization method and the equal energy concept which is used in the calculation of lateral load carrying capacity of the current seismic regulations are shown based on two bi-linear restoring force models with the constant initial stiffness and the constant yield deformation. Then, comparisons of the two methods and the two bi-linear restoring force models are conducted. As a result, it is concluded that the method based on the bi-linear restoring force model with the constant yield deformation is rational and effective for the required lateral load carrying capacity of the buildings with ductile moment-resisting frames.
