Upgrading steel I-beams using local post-tensioning

This paper investigates the behaviour of steel beams upgraded using locally pre-stressed reinforcing steel bars. The reinforcing bars were welded to the beam's flange or web at both ends and tensioned using a manual screw jack to increase the load-carrying capacity and stiffness of the beam. In...

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Bibliographic Details
Published in:Journal of constructional steel research 2015-10, Vol.113, p.127-134
Main Authors: Taoum, Assaad, Jiao, Hui, Holloway, Damien
Format: Article
Language:English
Subjects:
H beams
I beams
I-beams retrofit
Load-carrying capacity
Local prestress
Manuals
Rebar
Reinforcing steels
Stiffness
Structural steels
Upgrading
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Summary:This paper investigates the behaviour of steel beams upgraded using locally pre-stressed reinforcing steel bars. The reinforcing bars were welded to the beam's flange or web at both ends and tensioned using a manual screw jack to increase the load-carrying capacity and stiffness of the beam. In total, seven beams were upgraded and tested under three-point bending, using different configurations of reinforcing steel. Results showed that the level of pre-stress, the type of local prestress (internal or external) and the diameter of rebars used significantly affected the beams' stiffness and their ultimate load-carrying capacity. The results obtained in this study were compared to those of other methods used for upgrading steel beams. •Rebars are used to upgrade the load-carrying capacity of I-beams.•The rebars are prestressed using manual screw jack.•Increasing the rebar diameter will increase the beam's load-carrying capacity.•Increasing the tensioning force will increase the beam's stiffness.
ISSN:0143-974X
1873-5983
DOI:10.1016/j.jcsr.2015.06.012