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Steel and Composite Structures Volume 43, Number 4, May25 2022 (Special Issue) pages 447-456 DOI: https://doi.org/10.12989/scs.2022.43.4.447 |
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Analytical investigation of the cyclic behaviour of I-shaped steel beam with reinforced web using bonded CFRP |
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Anis I. Mohabeddine, Cyrus Eshaghi, José A.F.O. Correia and José M. Castro
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Abstract | ||
Recent experimental studies showed that deep steel I-shaped profiles classified as high ductility class sections in seismic design international codes exhibit low deformation capacity when subjected to cyclic loading. This paper presents an innovative retrofit solution to increase the rotation capacity of beams using bonded carbon fiber reinforced polymers (CFRP) patches validated with advanced finite element analysis. This investigation focuses on the flexural cyclic behaviour of I-shaped hot rolled steel deep section used as beams in moment-resisting frames (MRF) retrofitted with CFRP patches on the web. The main goal of this CFRP reinforcement is to increase the rotation capacity of the member without increasing the overstrength in order to avoid compromising the strong column-weak beam condition in MRF. A finite element model that simulates the cyclic plasticity behavior of the steel and the damage in the adhesive layer is developed. The damage is modelled using the cohesive zone modelling (CZM) technique that is able to capture the crack initiation and propagation. Details on the modelling techniques including the mesh sensitivity near the fracture zone are presented. The effectiveness of the retrofit solution depends strongly on the selection of the appropriate adhesive. Different adhesive types are investigated where the CZM parameters are calibrated from high fidelity fracture mechanics tests that are thoroughly validated in the literature. This includes a rigid adhesive commonly found in the construction industry and two tough adhesives used in the automotive industry. The results revealed that the CFRP patch can increase the rotation capacity of a steel member considerably when using tough adhesives. | ||
Key Words | ||
CFRP; cyclic; rotation capacity; seismic moment resisting frames; steel | ||
Address | ||
Anis I. Mohabeddine:1)Construct, Faculty of Engineering University of Porto, 4200-465 Porto, Portugal 2)Faculty of Civil Engineering and Geosciences, Delft University of Technology, Netherlands Cyrus Eshaghi:Construct, Faculty of Engineering University of Porto, 4200-465 Porto, Portugal José A.F.O. Correia:Construct, Faculty of Engineering University of Porto, 4200-465 Porto, Portugal José M. Castro:Construct, Faculty of Engineering University of Porto, 4200-465 Porto, Portugal | ||