Comparative Study of Structural Planning of Hotel Everbright Bojonegoro from Concrete Structure (existing) to Earthquake Resistant Steel Structure

Abstract

Indonesia is a country with a high potential for earthquakes due to its location at the convergence of four major tectonic plates. This condition frequently causes earthquakes, both on land and at sea, which have significant impacts on human safety and infrastructure damage. Hotel Everbright Bojonegoro is a high-rise building whose construction has been halted due to permit issues. In the initial design, the building used reinforced concrete structures. However, with the increasing threat of earthquakes, such as the Tuban earthquake and the potential for a megathrust event, it is important to consider more resilient structural alternatives. Steel structures are recommended as an alternative due to their high ductility. Previous studies have shown that steel structures can undergo large deformations without collapsing, compared to concrete structures. Therefore, in this final project, the author proposes an alternative structural design for the unbuilt Hotel Everbright Express using an earthquake-resistant steel structural system, specifically the Special Moment Resisting Frame (SMRF) system, in accordance with SNI 1729:2020 and SNI 7860:2020. The alternative design uses KingCross 588x300 columns, main beams with WF 600x200, WF 500x200, WF 450x200, and WF 400x200 profiles, and secondary beams with WF 400x200, WF 350x175, and WF 300x150 profiles. The floor slab thickness is 120 mm. The static shear force in the alternative design is 167,716.14 kg, which is lower than the existing design's static shear force of 252,417.42 kg. The maximum displacement in the alternative design is 42.24 mm in the Y direction, which is also smaller than the existing design's maximum displacement of 47.89 mm in the X direction. Both the alternative and existing designs meet the “Damage Control” (DC) performance level. However, the structural cost for the main elements (columns and beams) in the alternative design is higher, at IDR 12,592,200,000, compared to IDR 2,618,083,250 in the existing design.