| Summary: | In this article, a nonlinear analysis was carried out to develop two different models able to estimate the performance of partially prestressed concrete flexural members with unbonded post-tensioned strands, mainly; a methodology proposed by the first author and programmed using FORTRAN language, and the commercial finite element software program ABAQUS. These models intend to investigate the entire load-strain behavior and the corresponding load-deformation status of the structural concrete members with unbonded steel up to failure. The results of these two models were verified with the outcomes of the experimental work conducted by the authors. The experimental part consisted of testing 22 different simply supported flexural members (beams and one-way concrete slabs) post-tensioned by internally unbonded steel strands that varied by the cylinder compressive strength of concrete (fc′); jacking stress (fpj); prestressing index (ω); and span to depth ratio (ℓ/dp). The main objective of this article is to develop a numerical model applicable to investigate the performance of concrete flexural members reinforced by a combination of unbonded and bonded steel at various load levels. Compared to experimental data, the two developed models have the ability, with a large degree of agreement, to predict the overall behavior of these types of members in terms of cracking load, ultimate flexural resistance, load-deflection response, strain evolution, and total stress in unbounded strands.
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