ABSTRACT
ABSTRACT: This study focuses on the modelling of steel reinforcing bars subjected to a generalized loading history. The model of Monti and Nuti which is based on a set of experimental observations in order to account for buckling of the steel bars is examined. It has been noticed that in the case of partial unloading and then reloading, a common situation when a structure is subjected to seismic actions, the model might greatly overestimate the corresponding stress. An additional memory rule is thus proposed to eliminate this observed shortcoming. With the aid of the proposed modification, the Monti-Nuti model proved to be capable of simulating accurately the capacity of reinforced concrete members. The rules presented are easy to implement and applicable to any model in the literature where a similar situation is identified. Two case studies are examined where the enhanced model was proven capable to produce realistic numerical results.
