Shape Modification with Expansive Cement Concrete for Confinement with FRP Composites

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Title: Shape Modification with Expansive Cement Concrete for Confinement with FRP Composites

Author(s): Z. Yan, C.P. Pantelides, and L.D. Reaveley

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 1047-1066

Keywords: chemical post-tensioning; confinement; expansive cement concrete; FRP composites; stress-strain behavior

Date: 10/1/2005

Abstract:
To improve the confinement effectiveness of FRP composites for square andrectangular columns, shape modification is performed by using prefabricated FRP shellscombined with expansive cement concrete. Chemical post-tensioning using expansivecement concrete is used to change the FRP confinement from “passive” to “active”.Experimental results are presented demonstrating the effectiveness of this method. Ananalytical stress-strain model is developed for shape-modified FRP-confined columnswith expansive cement concrete which is based on the modified Willam-Warnkeplasticity model, the Popovics general stress-strain concrete model, and the dilatancybehavior obtained from the present study. This model is implemented by anincremental approach which accounts for the variable FRP confinement during theloading process. The analytical results show satisfactory agreement with theexperiments.