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    Shear strengthening of continuous reinforced concrete T-beams using wire rope units

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    Publication date
    2009
    Author
    Yang, Keun-Hyeok
    Byun, H-Y.
    Ashour, Ashraf F.
    Keyword
    REF 2014; Strengthening; Continuous T-beams; Wire rope; Shear; Mechanism analysis; Reinforced concrete
    Rights
    © 2009 Elsevier. Reproduced in accordance with the publisher's self-archiving policy.
    
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    Abstract
    A simple unbonded-type shear strengthening technique for reinforced concrete beams using wire rope units is presented. Ten two-span reinforced concrete T-beams externally strengthened with wire rope units and an unstrengthened control beam were tested to failure, to explore the significance and shortcomings of the developed unbonded-type shear strengthening technique. The main parameters investigated were the type, amount and prestressing force of wire rope units. All beams tested failed, owing to significant diagonal cracks within the interior shear span. However, beams strengthened with closed type wire rope units exhibited more ductile failure than the unstrengthened, control beam or those strengthened with U-type wire rope units. The diagonal cracking load and ultimate shear capacity of beams with closed-type were linearly increased with the increase of vertical confinement stresses in concrete owing to the prestressing force in wire rope units, while those of beams with U-type were minimally influenced. It was also observed that average stresses in closed-type wire ropes crossing diagonal cracks at ultimate strength of beams tested were much higher than those in U-type wire ropes, showing better utilization in the former case. The shear capacity of beams with closed-type wire rope units is conservatively predicted using the equations of ACI 318-05, modified to account for the external wire rope units. A mechanism analysis based on the upper bound approach of the plasticity theory is also developed to assess the load capacity of beams tested. The predictions by the mechanism analysis for beams with closed-type wire rope units are in good agreement with test results and showed a coefficient of variation slightly less than the modified ACI 318-05 equations. However, the modified ACI 318-05 equations are more conservative and simpler to use for design purposes.
    URI
    http://hdl.handle.net/10454/6243
    Citation
    Yang KH, Byun HY and Ashour AF (2009) Shear strengthening of continuous reinforced concrete T-beams using wire rope units. Engineering Structures, 31 (5): 1154-1165.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.engstruct.2009.01.003
    Type
    Article
    Collections
    Engineering and Informatics Publications

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