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dc.contributor.authorKeshtegar, Behrooz ( )
dc.contributor.authorGholampour, Aliakbar ( Orcid Icon 0000-0001-5069-2963 )
dc.contributor.authorOzbakkaloglu, Togay ( Orcid Icon 0000-0003-3015-736X )
dc.contributor.authorZhu, Shun-Peng ( Orcid Icon 0000-0003-2193-6484 )
dc.contributor.authorTrung, Nguyen-Thoi ( Orcid Icon 0000-0001-7985-6706 )
dc.date.accessioned2021-07-28T15:03:45Z
dc.date.available2021-07-28T15:03:45Z
dc.date.issued2020-03-23
dc.identifier.citationKeshtegar, B., Gholampour, A., Ozbakkaloglu, T., Zhu, S. P., & Trung, N. T. (2020). Reliability analysis of FRP-confined concrete at ultimate using conjugate search direction method. Polymers, 12(3), 707.en_US
dc.identifier.issn2073-4360
dc.identifier.urihttps://digital.library.txstate.edu/handle/10877/14112
dc.description.abstractIn this paper compressive strength and ultimate strain results in the current database of fiber-reinforced polymer (FRP)-confined concrete are used to determine the reliability of their design space. The Lognormal, Normal, Frechet, Gumbel, and Weibull distributions are selected to evaluate the probabilistic characteristics of six FRP material categories. Following this, safety levels of the database are determined based on a probabilistic model. An iterative reliability method is developed with conjugate search direction for evaluating the reliability. The results show that Lognormal and Gumbel distributions provide best probability distribution for model errors of strength and strain enhancement ratios. The developed conjugate reliability method provides improved robustness over the existing reliability methods owing to its faster convergence to stable results. The results reveal that the part of the database containing normal strength concrete (NSC) heavily confined (i.e., actual confinement ratio (flu,alf'co) > 0.5) by low and normal modulus carbon fibers (i.e., fiber elastic modulus (Eflu,alf'co ≤ 0.5) by aramid fibers exhibits a very high safety level. The segments of the database with a low and moderate safety level have been identified as i) NSC moderately and heavily confined by higher modulus glass fibers (i.e., Ef > 60 GPa), ii) high strength concrete (HSC) moderately and heavily confined (i.e., flu,alf'co > 0.3) by glass fibers, iii) HSC lightly confined (i.e., flu,alf'co ≤ 0.2) by carbon fibers, and iv) HSC lightly confined by aramid fibers. Additional experimental studies are required on these segments of the database before they can be used reliably for design and modeling purposes.
dc.formatText
dc.format.extent18 pages
dc.format.medium1 file (.pdf)
dc.language.isoenen_US
dc.publisherMultidisciplinary Digital Publishing Instituteen_US
dc.sourcePolymers, 2020, Vol. 12, No. 3, Article 707.
dc.subjectFiber-reinforced polymer (FRP)en_US
dc.subjectSafety levelen_US
dc.subjectReliability analysisen_US
dc.subjectModel erroren_US
dc.subjectFRP-confined concreteen_US
dc.titleReliability Analysis of FRP-Confined Concrete at Ultimate using Conjugate Search Direction Methoden_US
dc.typepublishedVersion
txstate.documenttypeArticle
dc.rights.holder© 2020 The Authors.
dc.identifier.doihttps://doi.org/10.3390/polym12030707
dc.rights.licenseCreative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
txstate.departmentIngram School of Engineering


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