Replacing Traditional Stirrups by Shear Steel Plate in High Performance Concrete Beams under Monotonic and Repeated Loads

Abstract

High performance concrete beam subjected to repeated loads is different from than the one subjected to static loads. Due to loading and unloading process crushing was caused by repeated loads in some part of concrete. Behavior of concrete under static loads was influenced by adding steel fibers, which amended many properties especially concrete tensile strength. These improvements are studied in this research under them effect of repeated loads, by testing simply supported high performance concrete fibrous reinforced beams with dimensions (1400x150 x 300) mm and percentages of steel fibers (0.5%) its design according to ACI544.4R-8[1]. The references is reinforced with normal stirrups while the other reinforced with different longitudinal shear steel plate. Repeated and static loads were applied to the beams through two points and for many cycles up to failure. All the results show low in ultimate strength under repeated load and increase in number and width of cracks. The results present that ductility under repeated load was less than under static load and the deflection under repeated load was higher than deflection under static load.