Abstract
The use of external CFRP jacket is examined as a retrofitting technique that improves the ductility and the load carrying capacity of the steel tube. The study focuses on the interaction between the steel and the jacket, which is treated as a contact problem. The contact conditions in the steel-CFRP interface are represented by interface laws. Finite element modeling is used to simulate the physical problem and the results of the numerical analysis are presented and discussed. CFRP-jacket is proved to be an effective strengthening method for hollow steel columns.
Highlights
Nowadays, a high number of existing steel buildings must be repaired or strengthened due to deterioration, structural deficiency or even poor maintenance
The use of external carbon fiber reinforced polymer (CFRP) jacket is examined as a retrofitting technique that improves the ductility and the load carrying capacity of the steel tube
This paper aims to investigate the appropriateness of fiber reinforced polymer as a retrofitting technique in steel columns by exploiting and formulating the corresponding contact conditions
Summary
A high number of existing steel buildings must be repaired or strengthened due to deterioration, structural deficiency or even poor maintenance. A key retrofit technique that has been extensively used in reinforced concrete structures is the application of carbon fiber reinforced polymer (CFRP), usually in the form of external jackets providing a reversible and nondestructive retrofit option. CFRP is adhesively bonded to the original structural element making its application easy to handle, quick and user friendly. This technique can be applied in steel structures since it offers great advantages. Steel structural elements strengthened with CFRP remain lightweight, no weld-initiated stresses are present and the danger from corrosion is minimized. The main difference of steel to reinforced concrete elements, that are strengthened using CFRP, is their mode of failure. A mathematical and a numerical approach of the problem are performed
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