Behavior of concrete columns under the confinement of transverse steel hoops and FRP

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Title: Behavior of concrete columns under the confinement of transverse steel hoops and FRP

Author(s): Ahmed Abd El Fattah, Mukhtar Azeez, and Hayder A. Rasheed

Publication: Special Publication

Volume: 327

Issue:

Appears on pages(s): 49.1-49.12

Keywords: fiber reinforced polymer (FRP), steel ties, axial stress-strain model, circular concrete columns, transverse confinement.

Date: 11/1/2018

Abstract:
FRP is customarily used to wrap concrete columns to increase their strength and strain capacities by providing extra confinement. Typically, steel hoops or spirals are used in constructed columns as mandated by codes. The behavior of retrofitted columns becomes thoroughly different because there are two systems with different mechanical response and interaction engaged in confinement. While most of the literature addressed concrete confined with FRP only, a limited number of studies and experimental cases accounted for both actions. This paper developed an axial stress-strain model which utilized geometric and mechanical properties of concrete, steel and FRP. The proposed work adopted Lam and Teng model for concrete confined with FRP, originally implemented in ACI 440.2R-17 guide, and calibrated its parameters against experimental curves. The proposed model correlates well with experimental cases that were collected from the literature.