Earthquake Response Evaluation With a New Hysteretic Model

Abstract eng:
This study addresses an acute need in the damage assessment of existing and new structures within the framework of performance based earthquake engineering: the ability to simulate in consistent, accurate and numerically robust fashion the damage evolution of structural components and systems under the effect of moderate and strong earthquake ground motions. The first part of the paper describes a new damage model for the response simulation of structural components with strength and stiffness degradation under cyclic loading condition. The second part of the study uses the damage model to evaluate the response of structural systems under two different suites of ground motions. Idealized as single-degree-of-freedom oscillators, two systems with very distinct hysteretic behaviors are selected for illustration: ductile and limited-ductility reinforced concrete frames. The performance evaluation focuses on strength loss and residual displacements, two measures that are considered critical for resilience assessment, identifying threshold values that would imply intolerable structural damage and economic loss. This analysis showcases the ability of the new hysteretic model to represent different degrading responses and to describe structural performance and post-earthquake condition through the model’s damage variable. Additionally, the large amount of generated data is used to investigate the evolution of these measures in each system, as related to other parameters such as the intensity of the ground motion, the extreme displacements, and the cyclic degradation.

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