Perbandingan Volume Dan Biaya Pekerjaan Struktur Metode Konvensional Dan BIM CUBICOST Pada Gedung Layanan Kesehatan Di Kota Manado

Abstract

Calculating the quantity of structural work is the basis for preparing a project cost estimate, yet it is still commonly done manually from two-dimensional drawings. This study compares the volume of concrete, the weight of reinforcement, and the cost of structural work obtained from the conventional method and from Building Information Modeling (BIM) using Cubicost TAS and TRB. The case study is a multi-storey healthcare building in Manado, covering pile caps, columns, beams, and floor slabs. Both methods used the same working drawings, element totals were summed from floor-by-floor results, and the same unit prices were applied, so that cost differences arise only from differences in quantity. The results show that Cubicost produced smaller quantities for all elements. Total concrete volume was 10,085.89 m³ with Cubicost compared with 10,370.79 m³ with the conventional method (2.75% difference), and total reinforcement weight was 1,683,944.68 kg compared with 1,728,855.34 kg (2.60% difference). The largest concrete difference occurred in columns (5.37%) and the largest reinforcement difference in pile caps (3.58%). Total structural cost was Rp 35,630,590,081 with Cubicost and Rp 36,593,798,662 with the conventional method, a difference of Rp 963,208,581 (2.63%). Because no independent field validation was available, the results show differences between the methods and do not establish which one is more accurate.