{"id":{"repo_id":"njit","oai_identifier":"oai:digitalcommons.njit.edu:dissertations-1733"},"canonical_url":"https://search.dev.ndltd.org/etd/njit/oai:digitalcommons.njit.edu:dissertations-1733","repository":{"repo_id":"njit","name":"NJIT","base_url":"https://digitalcommons.njit.edu/do/oai/"},"display":{"title":"Uniaxial and triaxial behavior of high strength concrete with and without steel fibers","abstract":"This study first presents an extensive experimental research program on the true uniaxial and triaxial compression behavior for both high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFHSC). The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive model. Emphasis is also put on the investigation of the variation of tangent Poisson's ratio under not only uniaxial but also triaxial stress conditions. The effect of cyclic loading on this parameter is also addressed. According to this research, under triaxial compression, there is no apparent advantage of steel fiber reinforced high strength concrete (SFHSC) over high strength concrete (HSC) in terms of triaxial strength, ductility and stress ~ strain behavior. The compressive meridians and the peak octahedral shear stress ([zeta]_{octp}) versus peak octahedral shear strain ([upsilon]_{octp}) relationships for the two types of concrete can be virtually expressed by a single expression respectively. Unlike most of the previous incremental constitutive models, the proposed new model utilizes the experimentally acquired octahedral shear stress ([zeta]_{otcp}) octahedral shear strain ([upsilon]_{oct}) relationship instead of the fictitious concept of \"equivalent uniaxial strain\" to locate the peak point of the triaxial stress ~ strain curve, which ensures its capability of simulating the whole load ~ deformation process for both HSC and SFHSC, including the descending branch in the stress ~ strain curve. The results from the model analysis comply with the experimental data fairly well under moderate confining pressures.","abstract_html":"This study first presents an extensive experimental research program on the true uniaxial and triaxial compression behavior for both high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFHSC). The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive model. Emphasis is also put on the investigation of the variation of tangent Poisson's ratio under not only uniaxial but also triaxial stress conditions. The effect of cyclic loading on this parameter is also addressed. According to this research, under triaxial compression, there is no apparent advantage of steel fiber reinforced high strength concrete (SFHSC) over high strength concrete (HSC) in terms of triaxial strength, ductility and stress ~ strain behavior. The compressive meridians and the peak octahedral shear stress ([zeta]_{octp}) versus peak octahedral shear strain ([upsilon]_{octp}) relationships for the two types of concrete can be virtually expressed by a single expression respectively. Unlike most of the previous incremental constitutive models, the proposed new model utilizes the experimentally acquired octahedral shear stress ([zeta]_{otcp}) octahedral shear strain ([upsilon]_{oct}) relationship instead of the fictitious concept of "equivalent uniaxial strain" to locate the peak point of the triaxial stress ~ strain curve, which ensures its capability of simulating the whole load ~ deformation process for both HSC and SFHSC, including the descending branch in the stress ~ strain curve. The results from the model analysis comply with the experimental data fairly well under moderate confining pressures.","abstract_has_math":false,"creators":["Lu, Xiaobin"],"institution":null,"degree_name":"Doctor of Philosophy in Civil Engineering - (Ph.D.)","degree_level":null,"degree_discipline":"Civil and Environmental Engineering","degree_department":null,"school":null,"contributors":["C.T. Thomas Hsu","William R. Spillers","Jay N. Meegoda"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005-01-31T08:00:00Z","date_published":"2005-01-31T08:00:00Z","updated_at":"2026-07-24T03:22:58Z","subjects":["High strength concrete","Triaxial compression","Octahedral shear stress","Engineering octahedral shear strain","Incremental constitutive model","Poisson's ratio","Civil Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.njit.edu/dissertations/678","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["C.T. Thomas Hsu","William R. Spillers","Jay N. 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The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive model. Emphasis is also put on the investigation of the variation of tangent Poisson's ratio under not only uniaxial but also triaxial stress conditions. The effect of cyclic loading on this parameter is also addressed. According to this research, under triaxial compression, there is no apparent advantage of steel fiber reinforced high strength concrete (SFHSC) over high strength concrete (HSC) in terms of triaxial strength, ductility and stress ~ strain behavior. The compressive meridians and the peak octahedral shear stress ([zeta]_{octp}) versus peak octahedral shear strain ([upsilon]_{octp}) relationships for the two types of concrete can be virtually expressed by a single expression respectively. Unlike most of the previous incremental constitutive models, the proposed new model utilizes the experimentally acquired octahedral shear stress ([zeta]_{otcp}) octahedral shear strain ([upsilon]_{oct}) relationship instead of the fictitious concept of \"equivalent uniaxial strain\" to locate the peak point of the triaxial stress ~ strain curve, which ensures its capability of simulating the whole load ~ deformation process for both HSC and SFHSC, including the descending branch in the stress ~ strain curve. The results from the model analysis comply with the experimental data fairly well under moderate confining pressures."]},{"key":"dc:title","label":"Title","values":["Uniaxial and triaxial behavior of high strength concrete with and without steel fibers"]}]}],"canonical_facts":{"dc:contributor":["C.T. Thomas Hsu","William R. Spillers","Jay N. Meegoda"],"dc:creator":["Lu, Xiaobin"],"dc:description.abstract":["This study first presents an extensive experimental research program on the true uniaxial and triaxial compression behavior for both high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFHSC). The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive model. Emphasis is also put on the investigation of the variation of tangent Poisson's ratio under not only uniaxial but also triaxial stress conditions. The effect of cyclic loading on this parameter is also addressed. According to this research, under triaxial compression, there is no apparent advantage of steel fiber reinforced high strength concrete (SFHSC) over high strength concrete (HSC) in terms of triaxial strength, ductility and stress ~ strain behavior. The compressive meridians and the peak octahedral shear stress ([zeta]_{octp}) versus peak octahedral shear strain ([upsilon]_{octp}) relationships for the two types of concrete can be virtually expressed by a single expression respectively. Unlike most of the previous incremental constitutive models, the proposed new model utilizes the experimentally acquired octahedral shear stress ([zeta]_{otcp}) octahedral shear strain ([upsilon]_{oct}) relationship instead of the fictitious concept of \"equivalent uniaxial strain\" to locate the peak point of the triaxial stress ~ strain curve, which ensures its capability of simulating the whole load ~ deformation process for both HSC and SFHSC, including the descending branch in the stress ~ strain curve. The results from the model analysis comply with the experimental data fairly well under moderate confining pressures."],"dc:identifier":["https://digitalcommons.njit.edu/dissertations/678"],"dc:subject":["High strength concrete","Triaxial compression","Octahedral shear stress","Engineering octahedral shear strain","Incremental constitutive model","Poisson's ratio","Civil Engineering"],"dc:title":["Uniaxial and triaxial behavior of high strength concrete with and without steel fibers"],"dc:type":["Dissertation"],"thesis:degree_discipline":["Civil and Environmental Engineering"],"thesis:degree_name":["Doctor of Philosophy in Civil Engineering - (Ph.D.)"]},"updated_at":"2026-07-24T03:22:58Z"}