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Evaluation of the dynamic p–yp loops of pile-supported structures on sloping ground

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Abstract

A key issue in the design of pile-supported structures on sloping ground is soil–pile interaction, which becomes more complicated in case of dynamic loading. This study aimed to evaluate the effect of slope on the dynamic behavior of pile-supported structures by performing a series of centrifuge tests. Three models were prepared by varying the slope and soil density of dry sand grounds. The mass supported on 3 by 3 group piles was shaken applying sinusoidal wave with various amplitudes. Test results showed that the location of maximum values and distribution shape of the bending moment below the ground surface varied noticeably with the pile position in the slope case. The relationship between the soil resistance and pile deflection (p–yp loops) was carefully evaluated by applying the piecewise cubic spline method to fit the measured bending moment curves along piles. It was found that the shape of the p–yp loops was irregular due to the effect of slope, and immensely influenced by the movement of the unstable zone. In addition, the effect of the pile group in the horizontal case was evaluated by comparing with the previously suggested curves that represent the relationship between the soil resistance and pile–soil relative displacement (p–y curves) to propose the multiplier coefficients.

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Data adopted from Wilson (1998)

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Data adopted from Wilson (1998)

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Acknowledgements

This research was supported by the project entitled “Development of performance-based seismic design technologies for advancement in design codes for port structures” funded by the Ministry of Oceans and Fisheries of Korea and the Basic Science Research Program funded by the Ministry of Education, South Korea (NRF-2017R1D1A1B03033738).

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Authors and Affiliations

  1. Department of Civil Engineering, Dong-A University, 840 Hadan2-dong, Saha-gu, Busan, South Korea

    Bao Ngoc Nguyen

  2. Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, South Korea

    Nghiem Xuan Tran & Sung-Ruyl Kim

  3. Earthquake Safety Research Division, Korea Institute of Civil Engineering and Building Engineering Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do, South Korea

    Jin-Tae Han

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  1. Bao Ngoc Nguyen
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  4. Sung-Ruyl Kim
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Correspondence to Sung-Ruyl Kim.

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Nguyen, B.N., Tran, N.X., Han, JT. et al. Evaluation of the dynamic p–yp loops of pile-supported structures on sloping ground. Bull Earthquake Eng 16, 5821–5842 (2018). https://doi.org/10.1007/s10518-018-0428-3

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  • DOI: https://doi.org/10.1007/s10518-018-0428-3

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