Abstract
In recent years, application of carbon fiber reinforced polymer (CFRP) composite materials in the strengthening of existing reinforced concrete structures has gained widespread attention, but the retrofitting of metallic buildings and bridges with CFRP is still in its early stages. In real life, these structures are possibly subjected to dry and hot climate. Therefore, it is necessary to understand the bond behavior between CFRP and steel at different temperatures. To examine the bond between CFRP and steel under hot climate, a total of twenty-one double strap joints divided into 7 groups were tested to failure at constant temperatures from 27°C to 120°C in this paper. The results showed that the joint failure mode changed from debonding along between steel and adhesive interface failure to debonding along between CFRP and adhesive interface failure as the temperature increased beyond the glass transition temperature (Tg) of the adhesive. The load carrying capacity decreased significantly at temperatures approaching or exceedingTg. The interfacial fracture energy showed a similar degradation trend. Analytical models of the ultimate bearing capacity, interfacial fracture energy, and bond-slip relationship of CFRP-steel interface at elevated temperatures were presented.
Highlights
Carbon fiber reinforced polymer (CFRP) has been widely implemented in rehabilitating or strengthening deteriorating structures such as buildings and bridges in civil engineering due to its preferable mechanical properties, including high strength, light weight, corrosion resistance, and formability [1,2,3]
Some researches have been conducted at ambient temperature and revealed that the adhesive layer was the weak link in this composite system, and one of the main failure modes observed was the debonding of CFRP from the steel substrate [7,8,9,10,11,12]
This paper presents results concluded from a series of CFRP-steel double strap joints tested in tension at temperatures ranging from 27∘C up to 120∘C
Summary
Carbon fiber reinforced polymer (CFRP) has been widely implemented in rehabilitating or strengthening deteriorating structures such as buildings and bridges in civil engineering due to its preferable mechanical properties, including high strength, light weight, corrosion resistance, and formability [1,2,3]. This has been the case for concrete structures. In the repair of steel structures with CFRP method, the CFRP is bonded to the steel surface using epoxy adhesives. Some researches have been conducted at ambient temperature and revealed that the adhesive layer was the weak link in this composite system, and one of the main failure modes observed was the debonding of CFRP from the steel substrate [7,8,9,10,11,12]
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