The effect twisted petung bamboo variations as reinforcement on concrete beam

Abstract

Reinforced Concrete is a composite material consisting of concrete and steel-reinforced concrete. Steel is used as reinforcement because it has high yield strength. However, the price of steel reinforcement is higher due to high demand. Besides having a relatively high price, steel is a non-renewable material, which makes the amount of course very limited as for other alternatives as a substitute for the concrete reinforcement, called bamboo. Bamboo is a renewable natural product with high tensile strength. With the many advantages of bamboo, especially petung bamboo as a construction material, therefore, necessary to research the flexural strength of bamboo petung reinforced beams. Reinforced bamboo used is twisted petung bamboo with a variation of three strands, five strands, and seven strands. The method used in this study is a numerical analysis based on standard concrete flexural strength test with two loading points. Analysis shows that tensile strength of bamboo strands for three strands amounted to 222.93 MPa, five strands of 230.04 MPa, and seven strands of 237.14 MPa. For the maximum load, The highest load produced for concrete beams with reinforcement three strands, five strands, and seven strands are 11.87 kN, 35.62 kN and 52.21 kN respectively. Meanwhile, The flexural strength produced for each scheme is 6.73 Mpa, 8.23 Mpa and 9.86 Mpa.