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Novel wedge-shaped bond anchorage system for pultruded CFRP plates

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Abstract

Prestressed strengthening with carbon fiber reinforced polymer (CFRP) plates has gained attention for the rehabilitation of existing structures. In this study, a novel wedge-shaped bond anchorage system was developed. The wedge-shaped adhesive in the bond zones exerted a high pressure on the CFRP plate when the CFRP plate was subjected to tension. The shear force along the fiber direction resisted the tension force of the CFRP plate, realizing reliable anchorage. The shear stress in the anchorage zone was distributed uniformly, owing to the deformation of the low-modulus adhesive. Therefore, the stress concentration was reduced, which generally occurs for traditional CFRP anchors and causes premature failure of the CFRP plate. The stress distribution in the anchorage zone was obtained by mechanical analysis, and the maximum anchorage-bearing capacity was calculated based on the critical bond-slip criterion of the CFRP plate and epoxy adhesive. The effects of the adhesive properties on the anchorage efficiency were also investigated. A test was performed to validate the effectiveness of the proposed anchorage system.

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Funding

This study was funded by the National Key Research and Development Program of China with Grant No. 2017YFC0703007, and the National Natural Science Foundation of China with Grant No. 51478145.

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Authors and Affiliations

  1. Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin, 150090, China

    Chenggao Li & Guijun Xian

  2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, China

    Chenggao Li & Guijun Xian

  3. School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, China

    Chenggao Li & Guijun Xian

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  1. Chenggao Li
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Correspondence to Guijun Xian.

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Li, C., Xian, G. Novel wedge-shaped bond anchorage system for pultruded CFRP plates. Mater Struct 51, 162 (2018). https://doi.org/10.1617/s11527-018-1293-x

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