From a displacement-based design perspective, the objective of assessing the deformation capacity of existing reinforced concrete members and systems is to ensure that the component deformation capacity DR exceeds the deformation demand Dd. Evaluating the dependable deformation capacity, which is central to developing a deformation-controlled assessment framework, is attempted in this paper through parametric investigations of mechanistic analytical models and by evaluation of the results of an extensive database of cyclic tests (approximately 500 prismatic reinforced concrete specimens) assembled from the international experimental literature. Particular emphasis is placed on strength and deformation capability of components with old-type detailing. Lower- bound expressions for deformation capacity are extracted from the investigation.
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