Analisis Respons Spektrum Struktur Portal Baja Canai Dingin Dua Lantai terhadap Variasi Ketebalan Profil
DOI:
https://doi.org/10.32832/komposit.v10i2.23691Keywords:
cold-formed steel, response spectrum, fundamental period, displacement, inter-story driftAbstract
This study addresses the gap regarding the global seismic response of bare CFS portal frames under Indonesian seismic codes, which previous researchs on CFS structures has predominantly focused on shear walls or bracing systems. Consequently, The novelty lies in evaluating the direct influence of thickness on global seismic response without additional stiffening elements. This study investigates the effect of profile thickness variation on the seismic response of a two-story cold-formed steel (CFS) portal frame using linear response spectrum analysis. The structural model employs a built-up 2C150x100 box section with thickness variations of 1.2, 1.6, 2.3, 3.0, and 3.2 mm. Modeling was conducted using SAP2000 v23 for a building in Gresik, Indonesia, situated on soft soil (SE). Seismic parameters followed Indonesian standards with SDS = 0.6384 g and SD1 = 0.158 g. Evaluated parameters include natural period, base shear, lateral displacement, and inter-story drift. Results indicate that increasing profile thickness significantly reduces the natural period from 1.73 s to 1.13 s (34.71% decrease), reflecting enhanced structural stiffness. Base shear increases with thickness, peaking at 10,541.97 N (X-direction) and 8,499.46 N (Y-direction) for the 3.2 mm model. Lateral displacement decreases from 10.44 mm to 6.90 mm (33.9% reduction), while first-floor inter-story drift drops from 6.94 mm to 4.48 mm. All models satisfy allowable inter-story drift limits, confirming structural safety. These findings demonstrate that profile thickness is a critical parameter controlling seismic performance, providing a practical reference for CFS design in earthquake-prone regions. By considering structural safety and material efficiency, the 3.0 mm profile thickness is recommended as the most optimal dimension for practical design.
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