Experiment on flexural behavior of corroded beam with flexural and shear strengthening(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年02期
- Page:
- 78-86
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Experiment on flexural behavior of corroded beam with flexural and shear strengthening
- Author(s):
- -
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- Keywords:
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- PACS:
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- DOI:
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- Abstract:
- In order to explore the mechanical behavior of corroded RC beam before and after flexural and shear strengthening, 7 corroded beams produced by applying constant current accelerated corrosion method were subjected to bending test after flexural and shear strengthening by bolting steel plates，and effects of the thickness of concrete cover, the secondary corrosion and flexural and shear strengthening on the deformation, strain and bearing capacity of test beams were analyzed. On this basis, the bond degradation of reinforcement and concrete was considered by adopting Combin39. Finite element numerical simulation for the strengthened beams were carried out, and the deformation and stress of model were compared with the experimental results. The results show that the flexural and shear strengthening can effectively improve the stiffness and bearing capacity of corroded beams, the secondary corrosion and the thickness of concrete cover had little influence on stiffness in early period. The difference of bearing capacity of the test beam before reinforcement is larger, but after the flexural and shear strengthening, the differences become relatively close. The main effects of the secondary corrosion on reinforced beams are corrosion degree and inhomogeneity which may change the failure mode and affect performance. The degradation of stiffness and reduction of the ultimate bearing capacity are mainly influenced by corrosion rate, while the protective layer has little influence on it. The strain of front and back beams before and after reinforcement is basically presented as linear trend, and the impact of thickness of protective layer on the neutral axis is weak. Weak anchoring effect caused by severe corrosion leads to a slight lag of the strain at the bottom
Last Update: 2018-04-03