Theoretical and experimental study on several calculation methods of cracking bending moment of reinforced concrete beams
Cracking moment is one of important parameters of reinforced concrete (RC) beams when considering the serviceability limit state. At present, the design standards give different assumptions in order to determine cracking moment, as mentioned or not to mention working out of the elastic limit of tension concrete. This study presents the calculation methods of cracking moment of RC beams that are based on three common codes of design practice, including: (i) American code ACI 318-14, (ii) Russian standard SP 63.13330.2012, and (iii) Vietnamese standard TCVN 5574:2012. In addition, in this study, 6 RC beams with the dimensions of B × H × L = 120 × 200 × 2200 mm were made of concrete having compressive strength class of B25 and into three testing sample groups with longitudinal reinforcements of 2Φ8, 2Φ10 and 2Φ12 at the bottom layer, respectively. The test data allow comparing the loads corresponding cracking moment between experimental study and theoretical calculation, and determining the effect of longitudinal reinforcement ratios on the cracking bending moment of RC beams.
RC beam; serviceability limit state; cracking moment; SP 63.13330.2012; ACI 318-14; TCVN 5574:2012.
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