DOI QR코드

DOI QR Code

Flexural and shear behavior of large diameter PHC pile reinforced by rebar and infilled concrete

  • Bang, Jin-Wook (TongYang Construction Materials R&D Center) ;
  • Lee, Bang-Yeon (School of Architecture, Chonnam National University) ;
  • Kim, Yun-Yong (Department of Civil Engineering, Chungnam National University)
  • Received : 2019.09.18
  • Accepted : 2020.01.10
  • Published : 2020.01.25

Abstract

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 R-LDPHC 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.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea(NRF)

References

  1. Akiyama, M., Abe, S., Aoki, N. and Suzuki, M. (2012), "Flexural test of precast high-strength reinforced concrete pile prestressed with unbonded bars arranged at the center of the cross-section", Eng. Struct., 34, 259-270. https://doi.org/10.1016/j.engstruct.2011.09.007.
  2. Bang, J.W., Hyun, J.H., Lee, B.Y. and Kim, Y.Y. (2014b), "Cyclic behavior of connection between footing and concrete-infilled composite PHC pile", Struct. Eng. Mech., 50(6), 741-754. https://doi.org/10.12989/sem.2014.50.6.741.
  3. Bang, J.W., Lee, B.Y., Lee, B.J., Hyun, J.H. and Kim, Y.Y. (2014a), "Effects of infilled concrete and longitudinal rebar on flexural performance of composite PHC pile", Struct. Eng. Mech., 52(4), 843-855. https://doi.org/10.12989/sem.2014.52.4.843.
  4. Canakci H. and Hamed M. (2017), "Experimental study on axial response of different pile materials in organic soil", Geomech. Eng., 12(6), 899-917. https://doi.org/10.12989/gae.2017.12.6.899.
  5. Choi, S.S. (2002), "A suggestion of high quality concrete for PHC pile", J. Korea Concrete Inst., 14(6), 41-48. https://doi.org/10.4334/JKCI.2002.14.1.041
  6. Ghiashi, V. and Moradi, M. (2018), "Assessment the effect of pile intervals on settlement and bending moment raft analysis of piled raft foundations", Geomech. Eng., 16(2), 187-194. https://doi.org/10.12989/gae.2018.16.2.187.
  7. Gurkan, O. and Cihan, T.A. (2009), "Lateral load response of steel fiber reinforced concrete model piles in cohesionless soil", Constr. Build. Mater., 23, 785-794. https://doi.org/10.1016/j.conbuildmat.2008.03.001.
  8. Kishida, S. (1998), "Experimental study on shear strength of the phc pile with large diameter", J. Struct. Constr. Eng., 510, 123-130. https://doi.org/10.3130/aijs.63.123_3
  9. KS F 4009 (2016), Ready-Mix Concrete Design, Korea.
  10. KS F 4306 (2014), Pre-Tensioned Spun High Strength Concrete Piles, Korea.
  11. Maedeh, P.A., Wu, W., da Fonseca, A.V., Irdmoosa, K.G., Acharya, M.S. and Bodaghi, E. (2018), "A new approach to estimate the factor of safety for rooted slopes with an emphasis on the soil property, geometry and vegetated coverage", Couple. Syst. Mech., 3(3), 269-288. https://doi.org/10.12989/acd.2018.3.3.269.
  12. Mitsuyoshi, A., Satoshi, A., Nao, A. and Motoyuki, S. (2012), "Flexural test of precast high-strength reinforced concrete pile prestressed with unbonded bars arranged at the center of the cross-section", Eng. Struct., 34, 259-270. https://doi.org/10.1016/j.engstruct.2011.09.007.
  13. Zhou, C., Chen, A. and Zhang, B. (2018), "Composite foundation bearing characteristics of PHC pile", Adv. Eng. Res., 170, 251-255. https://doi.org/10.2991/iceep-18.2018.43.

Cited by

  1. Study on Seismic Performance of Improved High-Strength Concrete Pipe‐Pile Cap Connection vol.2020, 2020, https://doi.org/10.1155/2020/4326208