Analysis Of Steel Truss Performance Using The Lrfd Method On Basko City Mall Building In Padang City

Abstract

West Sumatra is an earthquake-prone region that requires structural systems with sufficient strength, stiffness, and ductility to withstand seismic loads. This study evaluates the performance of a steel truss structure in Basko City Mall, Padang, using the Load and Resistance Factor Design (LRFD) method. Load calculations refer to loading protocol, while numerical analysis is carried out using Patran Nastran Student Edition 2023 to model structural behavior through the finite element method. The analysis focuses on five beam variations (B1, B2, B3, B4, and B5) tested under displacement to determine ultimate load capacity, stiffness, and plastic deformation capability. Results indicate that all beams are safe and stable under the applied loads. Beam B1 has the highest ultimate load capacity of 4153.09 kN, while Beam B3 provides the greatest stiffness of 41.048 N/mm. Beams B2, B4, B5 and B exhibit better ductility, allowing effective energy absorption before reaching failure. This study concludes that all beam variations are suitable for multi-story buildings in seismic-prone areas. The LRFD method proves effective in providing efficient and safe designs, while Patran Nastran supports more detailed analysis and can serve as a reference for future research on steel structure design.