Ma, Shengqiang and Bunnori, N. Muhamad and Kok, Keong Choong
(2016)
Evaluation of Ultimate Strength of Reinforced Concrete
Beams Strengthened with FRP Sheets under Torsion.
MATEC Web of Conferences, 47 (02006).
pp. 1-7.
ISSN 2261-236X
Abstract
The ultimate torque of reinforced concrete (RC) members strengthened with fiber
reinforced polymer (FRP) sheets does not only depend on the torque of RC members, but also
on the FRP contribution to the torque. For structural design, predicting the accurate torsional
capacity of the strengthened beams is considerably important. Three existing models for
calculating the ultimate torsional moment of RC beams and two existing models for computing
the FRP contribution to the ultimate torque are described and combined. Based on an
experimental database collected from existing literature, six combinations were discussed and
evaluated from the calculative values compared with the experimental results. The comparison
shows that the combination of ACI 318 and fib Bulletin 14 models (Group 2), as well as
Chinese and Ghobarah models (Group 6), can reasonably and accurately predict the ultimate
torque of beams strengthened with FRP sheet. Furthermore, the ultimate torque of six boxsection
beams strengthened with fully wrapping or U-wrap calculated by the Group 6 shows
closely to the experimental results.
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