EFFECT COMPRESSIVE STRENGTH ON BENING STRENGTH OF REINFORCED BEAMS PENGARUH KUAT TEKAN TERHADAP KUAT LENTUR BALOK BERTULANG Section Articles

Abstract

Reinforced concrete beams as structural elements play a large role in carrying the load. If the load borne by a reinforced concrete beam exceeds its flexural capacity, the beam will collapse. Used beams measuring (150 150 600)mm with a single reinforcement design of 3∅6 for flexural strength testing, and cubes measuring (150 150 150)mm for compressive strength testing. The planned compressive strength varies from 20 MPa, 27.5 MPa, 35 MPa, and 42.5 MPa. From the results of the study, the average compressive strength was 19.84 MPa, 25.91 MPa, 36.02 MPa, and 42.32 MPa. The average flexural strength of the compressive fiber (concrete flexural stress) obtained from each variation of the average compressive strength is 12.66 MPa, 15.34 MPa, 19.18 MPa, and 24.26 MPa. The average flexural strength of tensile fiber (flexural stress of steel) is 348.76 MPa, 399.02 MPa, 464.69 MPa, and 567.33 MPa. These results show the relationship between the compressive strength and flexural strength of reinforced concrete beams ranging from 2.84 to 3.73 which is obtained from the value of fr / f'cr'. This value is taken from the bending stress that occurs in the compression fiber section of the beam (concrete flexural stress).