TY - JOUR

T1 - Short-term bond behavior and debonding capacity of prestressed CFRP composites to steel substrate

AU - Hosseini, Ardalan

AU - Ghafoori, Elyas

AU - Wellauer, Matthias

AU - Sadeghi Marzaleh, Abdollah

AU - Motavalli, Masoud

N1 - Funding Information: This paper is an extended version of the authors’ paper presented in SMAR 2017 conference, 13–15 September 2017, ETH Zurich, Switzerland. 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 exceptional cooperation in performing the experiments. 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 - 2018/12/1

Y1 - 2018/12/1

N2 - In this study, the short-term bonding behaviors of prestressed CFRP plates to steel substrates and their debonding capacities have been investigated. For this purpose, single lap-shear and prestress release tests were performed on adhesively bonded CFRP-to-steel joints. The feasibility of accelerated curing (AC) of the adhesive by heating was also investigated based on the conducted tests. Moreover, bond tests with partial prestress release and subsequent lap-shear loading were conducted to examine the feasibility of prestressed strengthening of steel members using AC. A three-dimensional (3D) digital image correlation (DIC) technique was utilized to monitor the bond behavior of CFRP-to-steel joints. Experimental results demonstrated that a mixed-mode I/II (tensile/shear) fracture governs the debonding failure of CFRP-to-steel joints during the prestress release. However, given that the steel substrate cannot undergo tensile failure, a relatively high prestressing force can be transferred to the steel substrate prior to debonding. The experimental results also revealed that the AC of the epoxy adhesive can be an advantageous alternative to the conventional room temperature curing (RTC) for strengthening steel members with prestressed bonded CFRP plates.

AB - In this study, the short-term bonding behaviors of prestressed CFRP plates to steel substrates and their debonding capacities have been investigated. For this purpose, single lap-shear and prestress release tests were performed on adhesively bonded CFRP-to-steel joints. The feasibility of accelerated curing (AC) of the adhesive by heating was also investigated based on the conducted tests. Moreover, bond tests with partial prestress release and subsequent lap-shear loading were conducted to examine the feasibility of prestressed strengthening of steel members using AC. A three-dimensional (3D) digital image correlation (DIC) technique was utilized to monitor the bond behavior of CFRP-to-steel joints. Experimental results demonstrated that a mixed-mode I/II (tensile/shear) fracture governs the debonding failure of CFRP-to-steel joints during the prestress release. However, given that the steel substrate cannot undergo tensile failure, a relatively high prestressing force can be transferred to the steel substrate prior to debonding. The experimental results also revealed that the AC of the epoxy adhesive can be an advantageous alternative to the conventional room temperature curing (RTC) for strengthening steel members with prestressed bonded CFRP plates.

KW - Accelerated curing

KW - Carbon fiber reinforced polymer composite

KW - Digital image correlation

KW - Lap-shear test

KW - Prestressing

KW - Short-term bond behavior of CFRP-to-steel

KW - Strengthening of steel structures

UR - http://www.scopus.com/inward/record.url?scp=85054007736&partnerID=8YFLogxK

U2 - 10.1016/j.engstruct.2018.09.025

DO - 10.1016/j.engstruct.2018.09.025

M3 - Article

AN - SCOPUS:85054007736

VL - 176

SP - 935

EP - 947

JO - Engineering structures

JF - Engineering structures

SN - 0141-0296

ER -