ANALISIS MODIFIKASI TIE ROD pada JIB CRANE untuk MENINGKATKAN KAPASITAS ANGKAT MENGGUNAKAN METODE ELEMEN HINGGA

Abstract

Jib cranes are widely used lifting devices in industrial operations due to their simple construction, high operational flexibility, and ability to handle material transfer within limited working areas. This study aims to analyze the structural response of an original jib crane design and evaluate the effect of adding a tie rod on lifting capacity improvement using the finite element method (FEM). The analysis was conducted on two configurations: the original design without a tie rod and a modified design with an additional tie rod. Numerical simulations were performed using Fusion 360 with ASTM A36 steel material under several static loading conditions. The analyzed parameters included von Mises stress, total deformation, and safety factor. The simulation results showed that the original design remained safe under a load of 750 kg, with a maximum stress of 96.11 MPa, a deformation of 1.582 mm, and a safety factor of 2.58. However, when the load was increased to 1,000 kg, the maximum stress rose to 286.40 MPa, exceeding the material yield strength and reducing the safety factor to 0.87, indicating an unsafe condition. The addition of a tie rod significantly improved the structural performance. Under a 750 kg load, the maximum stress decreased to 30.70 MPa, deformation was reduced to 1.115 mm, and the safety factor increased to 8.10. Furthermore, under a 1,500 kg load, the modified structure still exhibited a maximum stress of only 61.32 MPa with a safety factor of approximately 4. The results demonstrate that the tie rod effectively reduces the bending moment acting on the boom, enhances structural stiffness, and safely increases the lifting capacity. Therefore, the tie rod modification can be considered an effective engineering solution for improving the performance and safety of jib cranes in industrial applications.