A Study on the Flexural-Shear Behavior of Concrete Beams and Comparison of the Experimental Test Results with the Prediction of Different Codes

In this research, a laboratory study was performed on the shear and flexural behavior of single-reinforced concrete (RC) beams without stirrups. For this purpose, four single-reinforced concrete beams with the dimensions of 250 by 300 mm and 1650 mm length and in four longitudinal reinforcement steel bars’ percentages of 0.36, 0.64, 1.05 and 1.45 of conventional rebars (S400) and concrete with compressive strength in the range of 35 Mpa were designed and all specimens were tested under four-point bending test. The test results presented that increasing of the reinforcement ratio of tensile rebars was efficient in increasing of the shear capacity of beams. Then, the shear and flexural strength obtained from the test were compared with the final shear and flexural strength predicted using AS3600, ACI, JSCE, EN, CSA, NZA , Iran codes and the proposed relationship by Al-Taan, and Al-Feel. The studies indicated the accuracy of the relationships proposed by Al-Taan and Al-Feel with an average of 1.26 times less than the experimental results, and the large difference between the values proposed by the Iranian Concrete Code and Japan (JSCE) Code with an average of 2.29 and 2.35 times, respectively less than the shear strength obtained from the test results, compared to other regulations in this research. In other words, they take a greater margin of confidence into account