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Computers and Concrete
  Volume 25, Number 1, January 2020 , pages 75-81

Flexural and shear behavior of large diameter PHC pile reinforced by rebar and infilled concrete
Jin-Wook Bang, Bang-Yeon Lee and Yun-Yong Kim

    The purpose of this paper is to provide an experimental and analytical study on the reinforced large diameter pretensioned high strength concrete (R-LDPHC) pile. R-LDPHC pile was reinforced with infilled concrete, longitudinal, and transverse rebar to increase the flexural and shear strength of conventional large diameter PHC (LDPHC) pile without changing dimension of the pile. To evaluate the shear and flexural strength enhancement effects of R-LDPHC piles compared with conventional LDPHC pile, a two-point loading tests were conducted under simple supported conditions. Nonlinear analysis on the basis of the conventional layered sectional approach was also performed to evaluate effects of infilled concrete and longitudinal rebar on the flexural strength of conventional LDPHC pile. Moreover, ultimate strength design method was adopted to estimate the effect of transverse rebar and infilled concrete on the shear strength of a pile. The analytical results were compared with the results of the bending and shear test. Test results showed that the flexural strength and shear strength of RLDPHC pile were increased by 2.3 times and 3.3 times compared to those of the conventional LDPHC pile, respectively. From the analytical study, it was found that the flexural strength and shear strength of R-LDPHC pile can be predicted by the analytical method by considering rebar and infilled concrete effects, and the average difference of flexural strength between experimental results and calculated result was 10.5% at the ultimate state.
Key Words
    LDPHC pile; flexural strength; shear strength; ultimate strength design method
Jin-Wook Bang: TongYang Construction Materials R&D Center, 2822-1, Gimpo-daero, Gyeonggi-do 10024, Republic of Korea
Bang-Yeon Lee: School of Architecture, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
Yun-Yong Kim: Department of Civil Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea

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