KAJI TEORETIS DAN EKSPERIMENTAL DEFLEKSI PADA BAJA ST 37 DENGAN VARIASI BENTUK HAT SECTION

The purpose of this study was to determine the ratio of the deflection that occurs in the cross-sectional shape of the hat section and the percentage difference in the deflection results of the steel profile of the hat section both theoretically and experimentally. The material used in this study was ST 37 steel with variations in the shape of the hat section, namely 60°, 75° and 90°. The deflection test uses a pin support with 5 observation points and a centralized loading location. The results showed that the smallest deflection value occurred in the theoretical and experimental heat section profile of 90° shape, which was 10.10 mm (theoretical), 7.41 mm (experimental), then in the 75° shape 10.71 mm (theoretical), 8.15 mm (experimental), and for 60° shape 13.95 mm (theoretical), 9.69 mm (experimental). While the results of the maximum percentage difference occurs in the hat section shape of 60° with a value of 30.98%. Based on the results of this study, it can be explained that the increasing the value of the moment of inertia, the smaller the deflection value that occurs due to the increase in the stiffness value of the material