The Flexural behavior of over reinforced sections is faster grown due to the popular retrofit technique among researchers and engineering worldwide. The main purpose of this work is to give a better and full understanding of the flexural behavior of over reinforced high strength concrete beams subjected to both static and repeated loading. Experimental tests were carried out on different beams having different grades of concrete and percentages of main steel under static or repeated loads. Concrete and steel strains and central deflection of cracking and ultimate loads were recorded for each tested beam. It is shown that the flexural behavior of over reinforced beams under repeated loading is quite different than that under static loading. 3 550 520 1260 90 20 135 Cement: Ordinary Portland cement was used (Assiut cement). Silica fume: Silica fume locally produced by Egyptian Ferro alloys Co. in Edfo city was used. Water: Drinking water was used for mixing concrete. Additives: A super plasticizer (ASTM C494 Type F) was used (Sikament 163 for mixes 1 and 2 and Sikament FF for mix 3), Its density is 1.2 kg/L Steel reinforcement: The used steel bars, as tension & compression reinforcement were high grade type bars of 10,16,18,22 mm diameter of proof strength 400 N/mm 2. However mild steel type with diameter 8 mm and of 330 N/mm 2 yield strength was used for stirrups.
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