A new beam-column model for seismic analysis of RC frames – Part II: Model Verification

In this investigation, the performance of the simplified Flexibility-Based Fiber Model (FBFM), proposed in Part I of this study, is evaluated. The proposed model relies on calculating the inelastic lengths at the ends of the Reinforced Concrete (RC) beam-column member in every load increment and using preset flexibility distribution functions along the inelastic lengths to integrate the overall element response. The model eliminates the need for monitoring the responses of many segments distributed along the member length which results in a significant reduction in computations.The model performance is evaluated in this study on a one element level of a beam-column element and on a structure level of a 3-story frame. The selected structures are subjected to static pushover, static cyclic and earthquake loading conditions. The results of the proposed model are compared with the outcomes of the conventional FBFMs. The comparison is achieved using global performance parameters such as the maximum drift ratios and local performance parameters such as the maximum strains in steel and concrete at the plastic hinge regions. The analysis conducted indicates that the proposed model is capable of describing with satisfactory accuracy and computational efficiency the response of RC frame structures.