PERENCANAAN ULANG STRUKTUR ATAS GEDUNG RUMAH SUSUN APARATUR SIPIL NEGARA (ASN) MAKASSAR SULAWESI SELATAN MENGGUNAKAN BAJA KOMPOSIT DENGAN SISTEM BRACING

As the population continues to grow and with the development of a provincial capital, the demand for supporting infrastructure in the form of highrise apartments becomes evident. The primary concern in the construction of highrise apartments or vertical housing is earthquakes. Makassar city itself is categorized as having a moderate earthquake risk. Additionally, advancements in construction technology include the use of composite materials, which involve the combination of two different materials, namely concrete and steel. Because of these factors, in the redesign of the superstructure of the Civil Servants' Housing Tower (ASN) in Makassar, which consists of 7 floors, it is planned to use a composite steel structure with a bracing system to withstand lateral forces caused by earthquakes.
Gedung Rumah Susun Aparatur Sipil Negara (ASN) Kota Makassar
Building is a structure built with reinforced concrete. This building is being redesigned using a composite steel structure with a bracing system for earthquake resistance, following the SNI 1729-2020 standards. The building is categorized as seismic risk level II and falls under seismic design category C. The redesign process begins with analyzing the seismic structure that will be used. In the redesign of this building, the seismic response spectrum analysis method is employed, resulting in the following design specifications: floor slab thickness of 120 mm, roof slab thickness of 120 mm, main beams using IWF 400x200x8x13 mm steel sections, secondary beams BA1 using IWF 300x150x6.5x9 mm steel sections, secondary beams BA2 using IWF 200x100x5.5x8 mm steel sections, columns using IWF400x400x13x21x22 steel sections, and bracing using IWF 150x150x7x10 mm steel sections. The analysis results, with the assistance of the ETABS software, show that floor displacements due to both gravity and seismic loads have been controlled within safe limits.