| Title |
Estimation of Lateral Dynamic P-multiplier of Group Pile Using Dynamic Numerical Analysis Results |
| Authors |
박정식(Park, Jeong-Sik) ; 정상섬(Jeong, Sang-Seom) |
| DOI |
https://doi.org/10.12652/Ksce.2018.38.4.0567 |
| Keywords |
동적 수치해석;군말뚝 효과;동적 p-y곡선;동적 p-승수 Dynamic numerical analysis;Group pile effect;Dynamic p-y curve;Dynamic p-multiplier |
| Abstract |
In this study, to investigate the effect of the stress reduction of group piles by dynamic loading, a dynamic p-y curve was established and the dynamic p-multiplier was calculated. Dynamic numerical analysis was performed by input sinusoidal waves to the bottom of the pile - ground system for $2{\times}2$ group pile, single pile and $5{\times}5$ group pile, single pile in dry sandy soil, and the pile spacing was changed to 2.5 and 5.0 times of the pile diameter. By establishing and comparing the dynamic p-y curves of the single pile and group piles, the dynamic group pile effect of the piles according to the pile center spacing and row position of the group pile piles is analyzed. $5{\times}5$ showed symmetry of the dynamic P-multiplier value around the pile origin coordinate. The dynamic p-multiplier value at the single pile, $5{\times}5$ pile (pile spacing: 2.5D) is 0.26 ~ 0.30 at the pile number 3, pile number 23, 0.14 pile number 13, and 0.14 ~ 0.38 at the pile number 5, pile number 18. These values differed from the static p-multiplier, especially due to the different loading conditions. The dynamic p-multiplier ($P_{dm}$) estimation through various types of input dynamic loads is expected to be used for dynamic design and analysis of group pile-ground systems of civil foundation structures. |