Application of endurance time method in damage assessment of concrete moment frames

Abstract

Nonlinear Time History (NTH) analysis is currently the most reliable method for estimating structural behavior. Considerable computational demand and complexity of this method may cause difficulty for its routine practical application. Based on the Methodology of Endurance Time (ET) method, it can estimate the nonlinear response of structures with a much lower computational cost. In this research, the reliability of the ET method in the analysis of concrete moment frames will be discussed. The results of the ET method are compared with those acquired from the NTH method by considering some energy Engineering demand parameters(EDP) like base shear roof displacement. Furthermore, the accuracy of this method for estimating damage in structures was evaluated by considering inter story Drift, Park-Ang, and Bozorgnia-Bertero models as samples of damage indices. It is observed that the nonlinear dynamic response of structures and damage indices can be estimated by the ET method with reasonable accuracy.

E-Cloud: Efficient seismic fragility assessment of structures based on enhanced cloud analysis

“…Unlike other traditional methods, the ETA adopts the endurance time acceleration functions (ETAFs) instead of a ground motion suite to consider the ground motion uncertainty. Several previous research studies (Amiri et al, 2020;Baniassadi and Estekanchi, 2020;Estekanchi et al, 2007Estekanchi et al, , 2020Riahi et al, 2009;Tavazo et al, 2012;Valamanesh and Estekanchi, 2011;Wei et al, 2021) have proven that the ETA method can be very efficient for seismic performance evaluation of structures, such as shell structures, steel moment frames, and braced frames. However, the generation of ETAFs depends on the time-consuming unconstraint optimization algorithm, which makes this method not convenient in some cases when new ETAFs are required.…”