Design of Reinforced Concrete Floor Slabs in a 3-Story Office Building in Lumajang Regency

Abstract

The design of reinforced concrete floor slabs is critical for load distribution and structural stability in multi-story office buildings. Objective: This study aims to design a two-way reinforced concrete floor slab for a three-story office building in Lumajang Regency using the direct design method according to national standards. Methods: A quantitative research approach was employed with document review as the primary data collection method. The study followed SNI 2847:2019 and SNI 1727:2020 standards. Population included all structural components of the building’s floor slab, with a sample focusing on the two-way slab system. Data analysis consisted of calculations based on the direct design method and software verification. Results: The optimal slab thickness was determined to be 210 mm with D12 mm reinforcement, satisfying strength and safety criteria. Stiffness ratio analysis confirmed effective load distribution between beams and slab for both exterior and interior zones. Conclusion: The application of the direct design method in this context ensures structural reliability and design efficiency for mid-rise office buildings. Further research is recommended to include experimental validation and consideration of advanced materials and seismic effects.