Perbandingan Kuat Lentur antara Tulangan Polos dan Ulir pada Balok Beton Bertulang

Abstract

Reinforced concrete as the beams element needs to conduct a reinforcement which is bending and sliding reinforcements. Bending on the beam is a result of the strain occurred as there is outside load causing the fiber on the element surface being lengthwise and experiencing drag and pressure. The tension works perpendicular to the structure cross-section surface. The research was conducted to study the strength of screw reinforced and to compare it to the strength of plain reinforced commonly used. This study aimed to find out the maximal bending loads, maximal flexural strength, and substantial differences between plain reinforced and screw reinforced to the simple reinforced concrete beams. The research was conducted at the Concrete Laboratory of Civil Engineering Study Program of the University of North Sumatra. The total sample of testing tools made were 6 tools, each variation made in 3 samples. The variations used were 3 samples on plain reinforced and the other 3 samples on screw reinforced by 10 mm diameter. The beam size was 15 cm width and 15 cm height, by the beam span of 50 cm. Based on the analysis, it was obtained on the maximal bending loads of 38.07 kN and maximal flexural strength of 5.06 MPa to the plain reinforced; on the maximal bending loads of 59.67 kN and maximal flexural strength of 7.91 MPa to the screw reinforced; the difference in flexural strength between both types of the reinforced was 21.9 % and occurred on the bending load of 21.1 %. Then, the rift occurred on the reinforced concrete beams using the screw reinforced as the main reinforced in the outside core area (5 % of the distance between the placement points). In the using, to use the screw reinforced is more suggested on the large construction because it can withstand the larger loads than the plain one. Whereas the plain reinforced is suggested to use on the simple construction which is more economic.