TY - JOUR

T1 - Behavior of prestressed CFRP plates bonded to steel substrate

T2 - Numerical modeling and experimental validation

AU - Martinelli, Enzo

AU - Hosseini, Ardalan

AU - Ghafoori, Elyas

AU - Motavalli, Masoud

N1 - Funding Information: The authors gratefully acknowledge the financial support provided by the Swiss National Science Foundation (SNSF Project No. 200021-153609). The authors would like to thank the technicians of the Structural Engineering Research Laboratory of Empa for their outstanding cooperation in performing the experimental tests. Furthermore, supports from S&P Clever Reinforcement Company AG, Switzerland through the provision of the materials used in the current study is acknowledged. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In recent years, retrofitting of steel structures has emerged as a major issue in structural engineering and construction management. As the adhesive bond is often the critical aspect controlling the actual performance of steel profiles externally strengthened by composite plates, this paper investigates the bond behavior of fiber reinforced polymer (FRP) composites glued to steel substrate; the effect of prestress, being relevant in practical applications, is also covered herein. A simplified mechanical model, based on assuming mode II fracture for FRP-to-steel debonding is formulated at first, and then, a numerical solution is implemented. The proposed solution is validated by experimental tests. Finally, a parametric study highlights the role of several relevant parameters on the response of carbon FRP plates under prestress-release tests; it paves the way for further developments of the present study aimed to predict the prestress force release and lap-shear behavior of FRP-to-steel bonded joints based on the mechanical properties of the materials and the bond-slip relationship assumed for the adhesive interface.

AB - In recent years, retrofitting of steel structures has emerged as a major issue in structural engineering and construction management. As the adhesive bond is often the critical aspect controlling the actual performance of steel profiles externally strengthened by composite plates, this paper investigates the bond behavior of fiber reinforced polymer (FRP) composites glued to steel substrate; the effect of prestress, being relevant in practical applications, is also covered herein. A simplified mechanical model, based on assuming mode II fracture for FRP-to-steel debonding is formulated at first, and then, a numerical solution is implemented. The proposed solution is validated by experimental tests. Finally, a parametric study highlights the role of several relevant parameters on the response of carbon FRP plates under prestress-release tests; it paves the way for further developments of the present study aimed to predict the prestress force release and lap-shear behavior of FRP-to-steel bonded joints based on the mechanical properties of the materials and the bond-slip relationship assumed for the adhesive interface.

KW - Debonding

KW - FRP

KW - Lap-shear test

KW - Numerical modeling

KW - Prestress release

KW - Steel

UR - http://www.scopus.com/inward/record.url?scp=85055891484&partnerID=8YFLogxK

U2 - 10.1016/j.compstruct.2018.09.023

DO - 10.1016/j.compstruct.2018.09.023

M3 - Article

AN - SCOPUS:85055891484

VL - 207

SP - 974

EP - 984

JO - Composite structures

JF - Composite structures

SN - 0263-8223

ER -