Title: Reinforced Concrete Columns Using High Strength Steel

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Publication: CIA

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Date: 2/13/2011

Abstract:
Steel reinforcement with a characteristic strength of 500 MPa is now in use in some countries including Australia and New Zealand to replace the traditional 400 MPa steel. Research works is being carried out on the ductility and serviceability issues of reinforced concrete (RC) beams and slabs using high strength steel. This paper investigates the strength increase of RC columns with the increase in strength of reinforcing steel. It is generally known that there is an increase in cross section strength of RC columns with the increase in steel strength. It has been shown analytically by comparison of cross-section strengths with 400 and 500 MPa reinforcing steels that either extra strength or steel saving could be obtained in RC columns by using high strength steel. However, it is necessary to take into account the other important parameters such as load eccentricity and column slenderness to determine the actual strength increase of an RC column. A non- linear analysis was used in this study to investigate the effect of different parameters such as load eccentricity, slenderness ratio, concrete strength and longitudinal reinforcement ratio on the strength increase. It was found that the benefit of using high strength steel in terms of strength of the RC columns varies with these parameters and is increased with an increase in the magnitude of load eccentricity.