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Experimental Investigation of Inner Bearing Strength of the Concrete Filled GFRP Box Sections with Different Contact Mechanisms

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Abstract

The characteristics of the interface bearing strength for the concrete filled GFRP box sections was studied conducting the experimental push-out tests. Hallow pultruded 125 mm long square GFRP box sleeves were cut from the pultruded GFRP sections, and naturally bonded, epoxy bonded, granular aggregate bonded surface treatments and mechanical connections were implemented on the specimens before concrete placement. The experimental results showed that the initial fracture strength of the naturally bonded specimen was increased from 0.28 MPa to 1.36 MPa with the epoxy bonded surface treatment. On the other hand, granular aggregate bonding surface treatment provided full composite action resulting confinement rupture of the GFRP boxes. Proper surface preparation allowed to distribute interface shear stresses while increasing the bearing capacity and did not cause localized bearing stresses as observed with presence of mechanical holes. Finally, confined cohesive zone material model (CCZM) was proposed and implemented in finite element models.

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Acknowledgements

The donation of the materials from MITAS Composites and SAYILI Premix Concrete firms are acknowledged. The author thanks to the laboratory personal of Zonguldak Bulent Ecevit University for helping the specimen preparations. The results and findings are only the author`s independent work and does not reflect the opinion of other parties.

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  1. Department of Civil Engineering, Zonguldak Bülent Ecevit University, 67100, Zonguldak, Turkey

    T. Ülger

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Ülger, T. Experimental Investigation of Inner Bearing Strength of the Concrete Filled GFRP Box Sections with Different Contact Mechanisms. Exp Tech 47, 895–906 (2023). https://doi.org/10.1007/s40799-022-00603-3

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