DESIGN OF THE OFFICE BUILDING OF THE PUBLIC WORKS OFFICE AND SPATIAL PLANNING (PUPR) OF BANJARBARU CITY WITH A STEEL STRUCTURE BASED ON SNI 1729-2020

Abstract

Steel materials have a superiority in terms of strength, rigidity, and ductility compared to other structural materials, in addition  to that  with the material being detailed and  high specific strength can produce a lighter structure.  In this study,  a redesign of the Banjarbaru City PUPR office building with a steel structure was carried out, this 2 (two) floor building with size  of  24 x 36 m² was previously designed using a reinforced concrete structure.  The designed structure falls into the category of B seismic design and is designed with a common moment-bearing frame system (SRPMB). The design results are for the roof structure used double elbow profiles ⊥50.50.5, ⊥45.45.4, and ⊥30.30.3, for floor plates using floordeck with a thickness of 0.75 with a plate thickness of 110 mm and wire mesh reinforcement M8 – 175. For the child beam and the main beam successively use the WF 250×125×6×9 and WF 300 x 150 x 5.5 x 8 profiles, where the beams are designed as composite beams. While the column uses the H150x 150x10x15 profile. Rigid Connection is carried out at the connection of the moment-retaining beams while simple connection is carried out at the beam-beam connection. For the foundation used pile foundations with dimensions of 25x25 cm are staked to a depth of 6 m. The results of the structure comparison obtained that the effective weight of the steel structure is almost 50% lighter than the concrete structure, so that the basic shear force, displacement, and deviation between floors (story drift) that occurs are smaller. For the comparison of the foundation used with the same dimensions and depth in the steel structure, 2 poles are needed, while for the concrete structure it takes 4 pieces to withstand the load of the upper structure.

Keywords: Steel Structure, Rigid Connection, Simple Connection. Earthquakes, Composites.