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http://dx.doi.org/10.4334/JKCI.2007.19.6.773

Shear Capacity of Reinforced Concrete Continuous T-Beams Externally Strengthened with Wire Rope Units  

Yang, Keun-Hyeok (Dept. of Architectural Engineering, Mokpo University)
Sim, Jae-Il (Dept. of Architectural Engineering, Mokpo University)
Byun, Hang-Yong (Korea E&C. Co. Ltd.)
Publication Information
Journal of the Korea Concrete Institute / v.19, no.6, 2007 , pp. 773-783 More about this Journal
Abstract
A simple unbonded-type shear strengthening technique for reinforced concrete beams using wire rope units is developed. Six two-span continuous T-beams externally strengthened with wire rope units and an unstrengthened control beam were tested. The main variables investigated were the amount and prestressing force of wire rope units. All specimens had the same geometrical dimension and arrangement of internal reinforcement. Influence of the distribution of vertical stresses in beam web owing to the prestressing force of wire rope units on the diagonal shear cracking load and the ultimate shear capacity of beams tested is presented. Based on the current study, it can be concluded that the amount and initial prestress of wire rope should be limited to be above 2.5 times the minimum shear reinforcement ratio specified in ACI 318-05 and below 0.6 times its own tensile strength, respectively, to ensure the enhancement of shear capacity and ductile failure mode of the strengthened beams. A numerical analysis based on the upper-bound theorem is developed to assess the shear capacity of continuous T-beams strengthened with wire rope units. From the comparisons of measured and predicted shear capacities, a better agreement is achieved in the proposed numerical analysis than in empirical equations recommended by ACI 318-05.
Keywords
wire rope unit; shear capacity; continuous T-beams; strengthening; prestress;
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Times Cited By KSCI : 1  (Citation Analysis)
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