Material Characterization of FRP Pre-Cured Laminates Used in theMechanically Fastened FRPStrengthening of RC Structures

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Title: Material Characterization of FRP Pre-Cured Laminates Used in theMechanically Fastened FRPStrengthening of RC Structures

Author(s): A. Rizzo, N. Galati, A. Nanni, and L.R. Dharani

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 135-152

Keywords: flexural strengthening; material characterization;mechanically fastened FRP pre-cured laminates

Date: 10/1/2005

Abstract:
The Mechanically Fastened-FRP (MF-FRP) strengthening system consists ofpre-cured FRP laminates having high longitudinal bearing strength attached to theconcrete surface using closely spaced steel fasteners in the form of nails or concretewedge anchors. The connection depends on several parameters such as, the intrinsiclaminates properties (tensile and bearing strength), diameter and effective embedmentlength of the fasteners, clamping force, presence and type of washer, presence andtype of filler in the gaps between the FRP material, the fastener and accessories, andthe concrete. This paper focuses on the material characterization of pultruded pre-cured laminate which was used as MF-FRP strengthening to retrofit and rehabilitate off-system bridges in Missouri, USA. Tensile tests, in the longitudinal and transversedirection of the laminate, were performed on full section and open hole coupons inorder to characterize the material. Bearing tests, in the longitudinal and transversedirection of the laminate, were performed to determine the capacity of the unrestrainedfastener-FRP-concrete connection.