Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Uniaxial behavior and constitutive model of reinforcement confined coarse aggregate UHPC
Highlights This study investigated the axial behavior of coarse aggregate ultra-high-performance concrete (CA-UHPC). On the basis of physical test results, the theoretical derivation of uniaxial constitutive model of the confined CA-UHPC was conducted.
Abstract The authors investigated the uniaxial behavior of reinforcement-confined coarse aggregate ultra-high-performance concrete (CA-UHPC) under compressive deformation. Twelve large-scale reinforcement-confined CA-UHPC column specimens were loaded, subjected to the uniaxial compressive deformation. The investigated variables included the volumetric stirrup ratio, sectional reinforcement ratio, and volumetric steel fiber ratio of the CA-UHPC. All specimens exhibited quasi-brittle failure modes and similar stress-strain relationships. The peak compressive stress and its corresponding reinforcement strain that confined the CA-UHPC had significant discrepancies relative to predictions made by classic confined concrete models. Theoretical derivation of uniaxial constitutive model of the confined CA-UHPC was conducted based on the test results. The internal confining effect was developed by considering the tensile capacity of the CA-UHPC. The theoretical solution indicated that the internal confining effect was dominant in comparison with the external confining effect of the stirrup. The tensile property of the CA-UHPC was the key factor influencing the overall uniaxial behavior of reinforcement-confined CA-UHPC. The authors propose a constitutive model of confined CA-UHPC. Three supplementary specimens were tested to verify the accuracy and applicability of this constitutive model, and the obtained test results demonstrated the model’s effectiveness.
Uniaxial behavior and constitutive model of reinforcement confined coarse aggregate UHPC
Highlights This study investigated the axial behavior of coarse aggregate ultra-high-performance concrete (CA-UHPC). On the basis of physical test results, the theoretical derivation of uniaxial constitutive model of the confined CA-UHPC was conducted.
Abstract The authors investigated the uniaxial behavior of reinforcement-confined coarse aggregate ultra-high-performance concrete (CA-UHPC) under compressive deformation. Twelve large-scale reinforcement-confined CA-UHPC column specimens were loaded, subjected to the uniaxial compressive deformation. The investigated variables included the volumetric stirrup ratio, sectional reinforcement ratio, and volumetric steel fiber ratio of the CA-UHPC. All specimens exhibited quasi-brittle failure modes and similar stress-strain relationships. The peak compressive stress and its corresponding reinforcement strain that confined the CA-UHPC had significant discrepancies relative to predictions made by classic confined concrete models. Theoretical derivation of uniaxial constitutive model of the confined CA-UHPC was conducted based on the test results. The internal confining effect was developed by considering the tensile capacity of the CA-UHPC. The theoretical solution indicated that the internal confining effect was dominant in comparison with the external confining effect of the stirrup. The tensile property of the CA-UHPC was the key factor influencing the overall uniaxial behavior of reinforcement-confined CA-UHPC. The authors propose a constitutive model of confined CA-UHPC. Three supplementary specimens were tested to verify the accuracy and applicability of this constitutive model, and the obtained test results demonstrated the model’s effectiveness.
Uniaxial behavior and constitutive model of reinforcement confined coarse aggregate UHPC
Zeng, Xianzhi (Autor:in) / Deng, Kailai (Autor:in) / Liang, Huanwei (Autor:in) / Xu, Rongyao (Autor:in) / Zhao, Canhui (Autor:in) / Cui, Bing (Autor:in)
Engineering Structures ; 207
17.01.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch