Pengaruh Variasi Kapasitas Rooftank Terhadap Kinerja Elemen Struktur Gedung Beton Bertulang

Abstract

This study evaluates the influence of rooftop water tank volume variations on the strength utilization of slabs, beams, and columns in the inpatient building of Budi Mulia Hospital, Bitung, and identifies the governing strength check. A quantitative analysis was conducted using a simplified analytical model with nine water volume scenarios ranging from 24,000 to 47,040 liters at 2,880-liter increments. Demand-to-capacity ratios (D/C) were evaluated for beam flexure and shear, column axial force–moment interaction about one axis and shear, and short-span slab flexure and punching shear. At the planned volume of 24,000 liters, all model checks yielded D/C < 1.00, with slab and beam flexural ratios of 0.830 and 0.741, respectively. At 47,040 liters, these ratios increased to 1.133 and 0.950, making slab flexure the governing check. The highest analyzed discrete volume satisfying all model checks was 35,520 liters, while 38,400 liters was the first scenario exceeding the slab flexural limit. Linear interpolation yielded an estimated model limit of approximately 36,952 liters. These findings indicate that slab flexure limits water volume increases within the analyzed configuration; establishing the actual building capacity requires verification of the assumptions and a more comprehensive assessment.