加固层厚度对PVA-RFCC加固梁弯曲性能的影响

doi:10.11896/cldb.19090192

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Abstract In order to both improve the crack resistance and ultimate load carrying capacity of reinforcement member significantly. A new type of polyvinyl alcohol fiber reinforced ferrocement engineered cementitious composite (PVA-RFCC) was proposed, which was composed of reinforcement mesh (RM) and steel mesh (SM) as a reinforcing element and polyvinyl alcohol fiber engineered cementitious composite (PVA-ECC) as a matrix. Seven strengthened beams and one control beam (CB) were prepared and tested using four-point bending system. Composite reinforcement layer (CRL) thickness was main parameter for investigating the influence of flexural behavior. Simultaneously, the expression of optimum CRL thickness was deduced. The results showed that the flexural behavior of the strengthened beams decreased with increasing CRL thickness when PVA-ECC was included or SM was added to the CRL, whereas they increased when RM was included or SM-RM was added to the CRL. The relationship between the CRL thickness and ultimate load was quadratic function. The coupling effect of SM-RM provided the best strengthening method, the SM can improve the ductility, and the RM can improve the load carrying capacity and stiffness. Combined with the experimental and theoretical results, the optimum CRL thickness was 40 mm when the PVA-ECC was included or SM was added to the CRL, and was 60 mm when RM or SM-RM was added in strengthened beams.

Key words： reinforcement mesh steel mesh thickness of composite reinforcement layer flexural behavior ductility stiffness

Published: 23 February 2021

CLC number:

TU375.1

Fund:This work was financially supported by the Key Research and Development Program in Huan Province(2018WK2111)and the Innovative Technology Investment Project in Hunan Province(2018GK5028).

Corresponding Authors: ycqjxx@seu.edu.cn

About author:: Wenping Du is a Ph.D. candidate at Southeast University and her major in structural engineering. She is mainly engaged in the study of the reinforcement of composite structures.
Caiqian Yang, Ph.D., professor, doctor tutor, received his Ph.D. degree in March 2006 from Ibaraki University of technology in engineering. He is currently a processor in Southeast University and his research inte-rests are high performance fiber reinforced composite materials and reinforcement of composite structures.

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Cite this article:

DU Wenping,YANG Caiqian,WANG Chong. Effect of Composite Reinforcement Layer Thickness on Flexural Behavior of Reinforced Concrete Beams Strengthened with PVA-RFCC[J]. Materials Reports, 2021, 35(4): 4067-4073.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19090192 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4067

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