Effects of cold weather on durability of CFRP strengthened circular hollow steel members
Kabir, Md Humayun, Fawzia, Sabrina, Chan, Tommy H.T., & Gamage, Kumari (2013) Effects of cold weather on durability of CFRP strengthened circular hollow steel members. In Al Mahaidi, Riadh (Ed.) Proceedings of the 2013 Asia-Pacific Conference on FRP in Structures (APFIS 2013), Swinburne University of Technology, Melbourne, Australia.
Tubular members have become progressively more popular due to excellent structural properties, aesthetic appearance, corrosion and fire protection capability. However, a large number of such structures are found structurally deficient due to reduction of strength when they expose to severe environmental conditions such as marine environment, cold and hot weather. Hence strengthening and retrofitting of structural members are in high demands. In recent times Carbon Fibre Reinforced Polymers (CFRP) composites appears to be an excellent solution to enhance the load carrying capacity and serviceability of steel structures because of its superior physical and mechanical properties. However, the durability of such strengthening system under cold environmental condition has not yet been well documented to guide the engineers. This paper presents the findings of a study conducted to enhance the bond durability of CFRP strengthened steel tubular members by treating steel surface using epoxy based adhesion promoter under cold weather subjected to bending. The experimental program consisted of six number of CFRP strengthened specimens and one bare specimen. The sand blasted surface of the three specimens to be strengthened was pre-treated with MBrace primer and other three were remained untreated and then cured under ambient temperature and cold weather (3oC) for three and six months period of time. The beams were then loaded to failure under four point bending. The structural response of each specimen was predicted in terms of failure mode, failure load and mid-span deflection. The research findings show that the cold weather immersion had an adverse effect on durability of CFRP strengthened structures. Moreover, the epoxy based adhesion promoter was found to enhance the bond durability in elastic range.
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|Item Type:||Conference Paper|
|Keywords:||Tubular steel member, CFRP, Strengthening, Durability, Cold weather, Surface pretreatment|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)|
|Divisions:||Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2013 International Institute for FRP in Construction|
|Deposited On:||13 Feb 2014 23:27|
|Last Modified:||19 Apr 2014 04:48|
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