Prediction of Shear Strength in Higher Strength Concrete Beams With Higher Web Reinforcement

Abstract

Recent development in concrete technology, especially during the last decade, has made it possible to produce the Higher Strength Concrete on commercial scale. The advantages of using higher strength concrete are numerous as it can economize variety of construction works such as long span bridges, off-shore structures and high rise building. The concrete mixture contains high cement contents, low water cement ratio, high quality aggregates and some admixtures (Super plasticizer and silica fumes etc). When properly mixed, consolidated and cured, such mixture gives higher strength, durability and excellent performance. An experimental investigation of the shear strength of higher strength concrete beams with high web reinforcement ratio was conducted. Six beams were designed in accordance with provision of ACI 2005. The beams were proportioned to exhibit high flexural strength and fail in shear. Concrete with compressive strength of 8000 to 10,000 psi was used in these specimens. The quantity of shear reinforcement provided in these beams is more than the minimum required by the ACI 2005. These beams had web reinforcement 6 inch centre-to-centre spacing.