Abstract
This paper presents an analytical study on the bond behavior of the double-lap FRP-to-steel bonded joint subjected to temperature variation. Closed-form solutions for the full-range bond behavior are derived and validated based on a fully reversible local interfacial bond-slip relation. Besides, finite element (FE) simulations considering the interfacial damage elasticity were conducted to investigate its influence on the interfacial bond behavior. Results show that unlike single-lap FRP-to-steel bonded joint, there exist critical temperature variations and bonding lengths that govern the fracture process of the bonded joint. Compared to the fully reversible bond-slip assumption, considering the interfacial damage elasticity has a significant influence on the bond behavior in the unloading stage in the case of temperature elevation, the load-carrying capacity is not affected provided that the bonding length is sufficiently long. While for a temperature drop, the local damage behavior in the bond-slip relation shows no influence.
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