Experimental Testing of Segmental UHPFRC Slabs Bonded-and-Bolted to Pultruded FRP I-Girders

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Title: Experimental Testing of Segmental UHPFRC Slabs Bonded-and-Bolted to Pultruded FRP I-Girders

Author(s): Hai Nguyen, Hiroshi Mutsuyoshi, and Wael Zatar

Publication: Special Publication

Volume: 322

Issue:

Appears on pages(s): 17.1-17.20

Keywords: Fiber-Reinforced Polymer I-Girder, Full-Length Precast Slab, Flexural Stiffness, Moment-Carrying Capacity, Segmental Precast Slabs, Ultra-High Performance Fiber-Reinforced Concrete, Ultimate Strength

Date: 6/18/2018

Abstract:
This work presents an experimental investigation of composite girders consisting of precast Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) slabs placed on pultruded Fiber-Reinforced Polymer (FRP) Igirders. Two control girder specimens and seven large-scale composite girders were tested under static four-point bending. Two series of the FRP-UHPFRC composite girders were examined. H-series girders composed of hybrid carbon/glass FRP (HFRP) I-girders topped with either full-length precast UHPFRC slabs or segmental counterparts. G-series girders included segmental UHPFRC slabs placed on glass-fiber-reinforced polymer (GFRP) I-girders. Twelve precast UHPFRC segments were used in each slab of the segmental composite girders. Either high-strength mortar or epoxy adhesive were used to join the precast UHPFRC segments. The test results revealed that the flexural stiffness of the composite girder with the epoxy-connected segmental precast slabs is almost identical to that of the full-length precast composite girder. The mortar-connected girder exhibited slightly more ductile behavior than the epoxy-connected girder. The G-series girder with thick GFRP plate externally bonded to the soffit of the GFRP Igirder showed pseudo-ductile behavior. All the composite girders demonstrated significant improvements in flexural stiffness and moment-carrying capacity compared with the control FRP I-girders without the UHPFRC slabs.