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Behaviour of high strength concrete columns confined with helices
Over the years, the technology of High Strength Concrete (HSC) has greatly improved and thus the demand for it is rapidly increasing because of its commercial availability, high performance characteristics and superior structural properties compared with normal strength concrete (NSC). It is now apparent from recent tests on HSC columns that improvement of the ductility of these members is needed. Helical reinforcement is used to resist the lateral expansion caused by the axial loads applied on the column. The inclusion of High Strength Steel (HSS) can further increase the resistance of lateral expansion of the HSC column and provide a triaxial behaviour for the concrete, thus increasing its strength and ductility. This paper presents an experimental study of the behaviour of four HSC columns confined by helical reinforcement of 500 MPa and with 500 MPa longitudinal reinforcement. Two NSC columns confined with a 500 MPa-grade helix and two confined with a 250-grade helix with 400-rade longitudinal bars were also tested. The helices were made of 10 mm diameter bars and had a constant diameter of 160 mm. A comparison on the effect of the pitch sizes for the helical reinforcement is made with the use of 50 mm and 75 mm pitches as well as the effect of the distribution of the longitudinal bars. With this variation in design, a higher strength, yet more ductile column can be achieved.
Behaviour of high strength concrete columns confined with helices
Over the years, the technology of High Strength Concrete (HSC) has greatly improved and thus the demand for it is rapidly increasing because of its commercial availability, high performance characteristics and superior structural properties compared with normal strength concrete (NSC). It is now apparent from recent tests on HSC columns that improvement of the ductility of these members is needed. Helical reinforcement is used to resist the lateral expansion caused by the axial loads applied on the column. The inclusion of High Strength Steel (HSS) can further increase the resistance of lateral expansion of the HSC column and provide a triaxial behaviour for the concrete, thus increasing its strength and ductility. This paper presents an experimental study of the behaviour of four HSC columns confined by helical reinforcement of 500 MPa and with 500 MPa longitudinal reinforcement. Two NSC columns confined with a 500 MPa-grade helix and two confined with a 250-grade helix with 400-rade longitudinal bars were also tested. The helices were made of 10 mm diameter bars and had a constant diameter of 160 mm. A comparison on the effect of the pitch sizes for the helical reinforcement is made with the use of 50 mm and 75 mm pitches as well as the effect of the distribution of the longitudinal bars. With this variation in design, a higher strength, yet more ductile column can be achieved.
Behaviour of high strength concrete columns confined with helices
Hadi, M.N.S. (author)
2001
7 Seiten, 1 Bild, 6 Tabellen, 5 Quellen
Conference paper
English
Behaviour of High Strength Concrete Columns Confined with Helices
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