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Behaviour of FRP wrapped normal strength concrete columns under eccentric loading
The study presented in this paper tested six eccentrically loaded concrete columns with carbon fiber reinforced polymer (CFRP) external confinement. Two of these columns were internally reinforced with typical internal steel reinforcement to justify the use of such practices to retrofit damaged columns in situ. The remaining specimens were made of plain concrete with supplementary layers of external confinement that were to represent the potential of external confinement in strengthening column structures. The strength gains obtained were marginal with an eccentric load. Ductility improvement was more distinctive than the gains in strength, particularly in the plain specimens. Confinement produced dependable gains in ductility that were shown by the lengthened behaviour of load-lateral deflection. Such behaviour was interpreted as the rotational capacity of column structures being enhanced. Additional layers of CFRP confinement allowed columns to absorb eccentric loads with increasing lateral deflections that were more capable of redistributing bending moments whilst excessive deformations took place. The objective to display greater strength of internally reinforced concrete columns with FRP external confinement was satisfied from tests results that compared Column C1 and Column C2. The addition of external confinement to plain specimens, in various layered formats, significantly improved behaviour in ductility, however strength gains were inconsistent and marginal when achieved. The confined columns each had the capacity to restrain volumetric strain or dilation of concrete material with enhanced circumferential restraint using the CFRP. Each column, excluding Column C5, performed at post-peak loads that would provide forewarning of failure in situ. To achieve significant structural gains in structures made of normal-strength concrete a minimum of three layers would be suggested from the limited tests conducted.
Behaviour of FRP wrapped normal strength concrete columns under eccentric loading
The study presented in this paper tested six eccentrically loaded concrete columns with carbon fiber reinforced polymer (CFRP) external confinement. Two of these columns were internally reinforced with typical internal steel reinforcement to justify the use of such practices to retrofit damaged columns in situ. The remaining specimens were made of plain concrete with supplementary layers of external confinement that were to represent the potential of external confinement in strengthening column structures. The strength gains obtained were marginal with an eccentric load. Ductility improvement was more distinctive than the gains in strength, particularly in the plain specimens. Confinement produced dependable gains in ductility that were shown by the lengthened behaviour of load-lateral deflection. Such behaviour was interpreted as the rotational capacity of column structures being enhanced. Additional layers of CFRP confinement allowed columns to absorb eccentric loads with increasing lateral deflections that were more capable of redistributing bending moments whilst excessive deformations took place. The objective to display greater strength of internally reinforced concrete columns with FRP external confinement was satisfied from tests results that compared Column C1 and Column C2. The addition of external confinement to plain specimens, in various layered formats, significantly improved behaviour in ductility, however strength gains were inconsistent and marginal when achieved. The confined columns each had the capacity to restrain volumetric strain or dilation of concrete material with enhanced circumferential restraint using the CFRP. Each column, excluding Column C5, performed at post-peak loads that would provide forewarning of failure in situ. To achieve significant structural gains in structures made of normal-strength concrete a minimum of three layers would be suggested from the limited tests conducted.
Behaviour of FRP wrapped normal strength concrete columns under eccentric loading
Verhalten von Betonsäulen normaler Festigkeit mit einem faserverstärktem Polymerüberzug unter exzentrischer Belastung
Hadi, M.N.S. (author)
Composite Structures ; 72 ; 503-511
2006
9 Seiten, 8 Bilder, 8 Tabellen, 17 Quellen
Article (Journal)
English
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