THE EFFECT OF STIFFENERS AND CASTELLATED BEAM HOLE COVERS ON BUCKLING IN RAMP DOOR CONSTRUCTION WITH FINITE ELEMEN METHOD. infrastruktur [Internet]. 2025 Oct. 31 [cited 2026 Feb. 25];11(2):69-78. Available from: https://journal.univpancasila.ac.id/index.php/infrastruktur/article/view/8474