Ma, Shengqiang and Bunnori, N. Muhamad and Choong, K. K.
(2016)
Behavior of Reinforced Concrete Box Beam Strengthened
with CFRP U-Wrap Strips Under Torsion.
MATEC Web of Conferences, 47 (02002).
pp. 1-8.
ISSN 2261-236X
Abstract
The present study focuses on the torsional strengthening behavior of reinforced
concrete (RC) box section beams that are widely used in bridges. Four RC box beams were
fabricated, and three of them were wrapped by carbon fiber-reinforced polymer (CFRP)
U-wrap strips with or without longitudinal strips. The different wrapping configuration,
cracking angle, failure pattern, and tensile strain of fibers were investigated and discussed
accordingly. The experimental results addressed that U-wrap strips strengthening also can
upgrade the ultimate torque of beams moderately. In particular, using U-wrap and longitudinal
strips to bond the box beams increased the torsional stiffness slightly. The same equation from
different codes for calculating RC specimens can accurately predict the ultimate strength of the
control beam, but the calculation of the fib model overestimated the torsional strengthening
improvement of the wrapped specimens. However, Ghobarah et al. assumed approximately
3000με of the average ultimate fiber strain in calculating the ultimate strength of the wrapped
box beams which shows in relatively appropriate agreement with testing results.
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