Flexural performances of prestressed high strength concrete piles reinforced with hybrid GFRP and steel bars |
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| Authors: | Ping Wu Yang Guo Dayong Zhu Weiliang Jin Zhenhua Zhang Rongzhu Liang |
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| Institution: | 1. Institute of Structural Engineering, Zhejiang University, Hangzhou, China;2. Anhui key laboratory of green building and assembly construction, Anhui Institute of Building Research &3. Design, Hefei, China;4. School of Civil Engineering and Architecture, Zhejiang University Ningbo Institute of Technology, Ningbo, China;5. College of Civil Engineering, Hefei University of Technology, Hefei, China;6. Faculty of Engineering, China University of Geosciences, Wuhan, China |
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| Abstract: | AbstractThis study developed prestressed high-strength concrete (PHC) piles reinforced with high-strength materials (glass fiber-reinforced polymer (GFRP) bars) for flexural performance enhancement. Flexural strengths and behaviors of PHC piles reinforced with hybrid GFRP and steel bars were experimentally investigated, respectively. Large-scale specimens with total lengths of 12,000?mm and diameters of 600?mm were constructed and tested under bending, accompanied by evaluation of effects of non-prestressed reinforcement type and longitudinal reinforcement ratio. J-factors were calculated to evaluate deformability of all the specimens. PHC piles reinforced with GFRP bars were demonstrated to have much higher flexural capacity than those reinforced with steel bars. Moreover, strains at the midspans of cross sections of all the specimens basically conformed to the assumption of plane section. Failure of PHC piles reinforced with GFRP bars was attributable to gradual concrete crushing, while that of PHC piles reinforced with steel bars resulted from steel yielding. Results of this study were expected to provide theoretical basis for wide engineering applications of PHC piles reinforced with hybrid GFRP bars and steel bars in marine structures. |
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| Keywords: | Hybrid reinforcement GFRP bar prestressed high-strength concrete pile flexural strength deformability |
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