Residual Drift Estimation for Moment Resisting Frames with Steel Degradation Properties

Abstract

AbstractInter‐story drifts are the most important engineering demand parameters required for the evaluation of performance of structures subjected to lateral loading. Even though the transient inter‐story drifts are usually used for the assessment and design using the codes of practice, the residual drifts often govern the economic loss in buildings. Therefore, the residual drifts can be critical in the post‐earthquake evaluation of the structures and should be given greater consideration in the process of design of steel moment resisting frames (MRFs). This study examines an improved approach for the estimation of the residual drift demands in steel moment resisting frames subjected to realistic earthquake loading. The advancement is implemented through application of a steel degradation material model in order to capture the stiffness degradation in the inelastic range correctly. Then, this modelling is compared with simplified bilinear steel material model in order to demonstrate the advantages of the deterioration model in performance‐based assessment.