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Abstract
Modern building construction requires numerous pipes and ducts for services like air conditioning and electricity, often accommodated by web openings in beams. This study investigates the structural performance of Concrete-Filled Steel Tube (CFST) beams with transverse openings, which can affect their load-carrying capacity and behavior. Eight CFST beams and four Hollow Steel Tube (HST) beams were tested under two concentrated loads, including four CFST and two HST beams with transverse openings. The present research examines how openings impact load capacity, failure modes, ductility, strain, and Energy Absorption (EA) across varying cross-sections and Depth-to-thickness (D/t) ratios. The results show that transverse openings significantly affect CFST beams more than HST beams. The load-carrying capacity of CFST beams was reduced by up to 18.6%, while HST beams exhibited reductions of only up to 3.77%. Ductility and EA followed similar trends, with CFST beams experiencing reductions of up to 20% in ductility and 30.7% in EA. The HST beams showed relatively minor decreases of 2.54% in ductility and 14.1% in EA. The failure of CFST beams with openings was characterized by steel rupture through the openings. The effect of openings increased with higher D/t ratios. Despite the reductions caused by the openings, the overall enhancement in all studied aspects provided by the concrete filling in CFST beams with transverse openings remained significant.
Published Version
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