Khamail Abdul-Mahdi Mosheer1, Jenan N. Almusawi2,*
1Department of Civil Engineering, University of Al-Qadisiyah, Iraq
2Department of Civil Engineering, University of Kufa, Iraq
Received March 9, 2023; Revised May 25, 2023; Accepted June 11, 2023
Cite This Paper in the Following Citation Styles
(a): [1] Khamail Abdul-Mahdi Mosheer, Jenan N. Almusawi , “Experimental Study of Steel Box Beams Strengthened by Steel Truss Under Torsion,” Civil Engineering and Architecture, Vol. 11, No. 5, pp. 2676 – 2686, 2023. DOI: 10.13189/cea.2023.110532.
(b): Khamail Abdul-Mahdi Mosheer, Jenan N. Almusawi (2023). Experimental Study of Steel Box Beams Strengthened by Steel Truss Under Torsion. Civil Engineering and Architecture, 11(5), 2676 – 2686. DOI: 10.13189/cea.2023.110532.
Copyright©2023 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License
Abstract Due to its excellent torsional properties, box beams are frequently used for structural elements that are both curved and straight. One of the most important problems in the steel thin section is warping, so the strengthening technique was used in the current research to reduce warping and increase the torsion capacity. The paper presented an experimental investigation of the torsional behavior of seven steel box beams under pure torsion. One of the beams without strengthening was used as a reference, while the other specimens were strengthened using an internal steel truss with different lengths and sizes. The internal steel truss consists of (38×38×3)mm or (50×50×2)mm smooth steel angles as upper and lower chords and steel plates with a thickness of 3.8mm at 365mm center to center were used as struts in all steel trusses. The results of tests indicated that strengthening influenced the torsional failure loads and angle of twist, and the torsional behavior of the strengthening steel box beams was improved. The maximum torsional moment capacity of strengthening beams by steel truss with steel angle size of (38×38×3)mm or (50×50×2)mm was nearly more significant than reference beam and reached to 49.54% and 42.2% respectively. On the other hand, the torsional strength of strengthening steel box beams was increased as the width/ thickness ratio (b/t) of the steel angle leg decreased. However, the torsional capacity was raised by about (37.1-41.7)% as the length of the strengthening increased from 20% to 100% of the full length of the box beam. Furthermore, the strengthening of box beams could advance their torsional rigidity and stiffness through reducing the angle of twist.
Keywords Steel Box, Strengthened, Steel Truss, Angle of Twist, Torsional Strength

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