Failure mode of truss system concrete beams strengthened with tensile reinforcement

Abstract

Abstract Cracks usually precede beams failures. Cracks occurred due to the applied load exceeds the capacity of the cross-section in carrying the load. The use of a diagonal reinforcement or truss system can increase the flexural capacity of the beams. The previous research of using truss system reinforcement in the beam without concrete in the tension zone causes a decrease in flexural capacity due to the cracks in the area near the support. Therefore, it is necessary to add tensile reinforcement in the zone. This study uses a truss reinforced concrete beam specimen with dimensions of 15 cm x 20 m x 330 cm. There are four variations of the specimens, namely Normal Beams (BN) as control beam, BTRP 40D, BTRP 60D, and BTRP 80D. The flexural test is carried out by monotonic static loading. The results showed that the flexural capacity of BTRP 40D, BTRP 60D, and BTRP 80D increased due to the addition of tensile reinforcement in the support zone. Moreover, the failure mode of BTRP 60D and BTRP 80D are under reinforced and cracking does not occur in the support zone. Meanwhile, the BTRP 40D beam shows wide cracks in the support zone.

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