Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hollow concrete cylinders confined with CFRP: Strength and size effect
Highlights Hollow concrete cylinders fully- and partially-confined with carbon fiber reinforced polymer sheets are tested. Size effects are examined with similar geometric configurations. Analytical modeling is conducted and design recommendations are proposed.
Abstract This paper presents the behavior of hollow concrete cylinders fully- and partially-confined with carbon fiber reinforced polymer (CFRP) sheets. To examine a potential size effect, geometrically similar configurations are considered (diameter to height = 1:2 and inner to outer diameters = 0.75:1.0) with two confining schemes (one-end and both-end wrapping). A total of 72 cylinders are tested, followed by analytical modeling to complement experimental findings. The load-carrying capacity of the cylinders is controlled by the size, CFRP-coverage, and confining methods. The strength of the partially-confined concrete is reliant upon the interaction between the confined and unconfined portions in tandem with stress-restraint zones. Both-end confinement shows better strengthening effects than its one-end counterpart. Three types of failure modes are observed (diagonal tension cracking, local crushing of unconfined concrete, and rupture of CFRP), depending on the degree of CFRP-confinement and wrapping configurations. The unconfined concrete away from the loaded region (40% of the cylinder height) remains undamaged until the strengthened portion fails. The circumferential and radial stresses of the cylinders are influenced by their outer-diameter where the CFRP-concrete interface exists. As the size of the cylinders increases, the failure of the CFRP system is retarded. The core strength of the confined cylinders is uninfluential on the development of radial pressure and the behavior of the CFRP-concrete interface. A design model is proposed for technology transfer.
Hollow concrete cylinders confined with CFRP: Strength and size effect
Highlights Hollow concrete cylinders fully- and partially-confined with carbon fiber reinforced polymer sheets are tested. Size effects are examined with similar geometric configurations. Analytical modeling is conducted and design recommendations are proposed.
Abstract This paper presents the behavior of hollow concrete cylinders fully- and partially-confined with carbon fiber reinforced polymer (CFRP) sheets. To examine a potential size effect, geometrically similar configurations are considered (diameter to height = 1:2 and inner to outer diameters = 0.75:1.0) with two confining schemes (one-end and both-end wrapping). A total of 72 cylinders are tested, followed by analytical modeling to complement experimental findings. The load-carrying capacity of the cylinders is controlled by the size, CFRP-coverage, and confining methods. The strength of the partially-confined concrete is reliant upon the interaction between the confined and unconfined portions in tandem with stress-restraint zones. Both-end confinement shows better strengthening effects than its one-end counterpart. Three types of failure modes are observed (diagonal tension cracking, local crushing of unconfined concrete, and rupture of CFRP), depending on the degree of CFRP-confinement and wrapping configurations. The unconfined concrete away from the loaded region (40% of the cylinder height) remains undamaged until the strengthened portion fails. The circumferential and radial stresses of the cylinders are influenced by their outer-diameter where the CFRP-concrete interface exists. As the size of the cylinders increases, the failure of the CFRP system is retarded. The core strength of the confined cylinders is uninfluential on the development of radial pressure and the behavior of the CFRP-concrete interface. A design model is proposed for technology transfer.
Hollow concrete cylinders confined with CFRP: Strength and size effect
Kim, Yail J. (Autor:in) / Gao, Junhao (Autor:in)
20.03.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Hollow concrete cylinders confined with CFRP: Strength and size effect
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