期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 23, 期 4, 页码 1544-1554出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2008.09.019
关键词
Concrete beams; Strengthening; Shear strength; FRP; Stress distributions
资金
- Natural Science Foundation of China [50238030]
- Tsinghua University [JC2007003]
- Hong Kong Research Grants Council [PolyU 5151103E]
- Royal Society [IS 16657]
- Royal Society
- The Hong Kong Polytechnic University
Reinforced concrete (RC) beams may be strengthened for shear with externally bonded fibre reinforced polymer (FRP) composites through complete wrapping, U-jacketing or bonding on their sides only. The two main shear failure modes of such strengthened beams are FRP rupture and debonding. In both modes of failure, the contribution of the bonded FRP reinforcement to the shear capacity of the beam depends strongly on the stress (or strain) distribution in the FRP at the ultimate limit state. This paper presents a numerical study of the FRP stress distribution at debonding failure in U-jacketed or side-bonded beams using a rigorous FRP-to-concrete bond-slip model and assuming several different crack width distributions. Numerical results indicate that Chen and Teng's early simple assumption [Chen JF, Teng JG. Shear capacity of FRP-strengthened RC beams: FRP debonding. Constr Build Mater 2003;17:27-41] for the stress distribution in the FRP results in satisfactory predictions for the effective FRP stress in most cases for both U-jacketed and side-bonded beams. However. it may become unconservative for side-bonded beams that have only light flexural steel reinforcement. (c) 2008 Elsevier Ltd. All rights reserved.
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