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All Journal CRANE: Civil Engineering Research Journal
Gita Indah Puspitasari Wahyudi
Universitas Katolik Parahyangan
Civil Engineering, Building, Construction & Architecture

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PERILAKU TEKUK TORSI SUMBU TERKEKANG PADA KOLOM BAJA PROFIL WF: KAJIAN DENGAN METODE ELEMEN HINGGA Gita Indah Puspitasari Wahyudi; Bambang Suryoatmono; Helmy Hermawan Tjahjanto
CRANE: Civil Engineering Research Journal Vol 8 No 1 (2027): CRANE - APRIL
Publisher : Program Studi Teknik Sipil, Fakultas Teknik dan Ilmu Komputer, Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/crane.v8i1.20197

Abstract

This study examines the effect of constrained-axis torsional buckling on steel column with a lateral restraint applied to one flange at the column midspan. The column dimensions used are WF300 x 150 (L = 4000 mm), WF600 x 200 (L = 8000 mm), and WF300 x 300 (L = 12000 mm). The analysis was carried out using finite element analysis with S4R shell elements. Linear buckling analysis (LBA) and geometrically-materially nonlinear analysis with imperfections (GMNIA) with an initial imperfection of L/500 were performed. The results confirm that CATB governs the elastic buckling mode in all three models. Comparison with AISC 360-22 analytical predictions shows that the current provisions are conservative for compact sections (WF300×150 by 4.65% and WF300×300 by 15.91%) but unconservative for the deep slender-web section WF600×200 by 21.88%. PEEQ distributions reveal that CATB failure is predominantly governed by geometric nonlinearity rather than widespread material yielding across all models. An effective length modification factor k is proposed, with K elastic ≈ 1.33 and K inelastic range from 1.5 to 1.9, suggesting that the AISC effective length assumption of Lcz = L/2 underestimates the actual effective length by approximately 33%. These findings highlight a gap in the current AISC 360-22 CATB provisions for sections with slender webs and provide a basis for further parametric investigation.
Co-Authors Bambang Suryoatmono Helmy Hermawan Tjahjanto