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.
Highlights
High performance concrete (HPC) is defined as that kind of concrete which give the best performance and suitable result which cannot be carried out by normal concrete
It was shown that the deflection at the ultimate load in beams (BPV65M and BPI65M) was higher than the control beam (BM) in beams (BPV65R, BPI65R) it was higher than the control beam for group 2
1- The result show that the longitudinal shear steel plates are a good alternative to use instead of normal stirrups whatever the case under static and repeated load
Summary
High performance concrete (HPC) is defined as that kind of concrete which give the best performance and suitable result which cannot be carried out by normal concrete. HPC is often made with the use of chemical and mineral admixtures such us superplasticizers, fly ash, ground granulated blast furnace slag, silica fume and steel fiber to produce a composite mainly characterized by its low porosity and fine pore structure. Abbas/ Diyala Journal of Engineering Sciences Vol (13) No 3, 2020: 123-132 steel plate as shear reinforcement instead of normal stirrups (Ibrahim, et al, 2016). The exposure to repeated loading for many structure such like machine vibration, sea waves, wind action and automobile traffic results in a regular lowering in the stiffness of the structure, which may lead to fatigue failure [9] [10]
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