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| dc.contributor.author | DESALEGN, AMARE FETENE | |
| dc.date.accessioned | 2021-10-21T07:15:03Z | |
| dc.date.available | 2021-10-21T07:15:03Z | |
| dc.date.issued | 2020-06-25 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12838 | |
| dc.description.abstract | 3D ABAQUS model has been conducted to investigate the effect of negative skin friction on piles installed through soft clay .Coulomb frictional model built in ABAQUS can be selected to depict the interaction at the pile-soil interface condition which has frictional coefficient . NSF is a common problem if a pile is designed in a highly compressible soil. A grid configuration of 3 x 3, 4 x 4 and 5 x 5 piles was considered for this research. The effects of pile tip, pile shaft friction, pile socket length, and magnitude of applied load and load variation on the pile were studied. The pile cap selection was done by considering formation of constant pile cap settlement and uniform distribution of loads throughout the pile cap length. In the case of a short pile, the negative skin friction may cover the most entire length, and accordingly, the down-drag force is transmitted to the pile’s tip in the form of penetration to the underlying strata, whereas for a long pile, the down-drag force is mainly taken by the compression of the pile’s material and little or none is transmitted to the pile’s tip. The maximum mobilized negative shaft resistance developed at the entire depth of the pile and this value changed to zero at the neutral point. At the working load level, the drag force may be large enough to reduce the pile capacity or to overstress the pile’s material, causing fractures or perhaps structural failure of the pile, or possibly pulling out the pile from the cap when L/D become small. For similar axial load application into the model with and without pile cap, the negative skin friction distribution made visible difference. | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | CIVIL AND WATER RESOURCE ENGINEERING | en_US |
| dc.title | THREE-DIMENSIONAL NUMERICAL INVESTIGATION OF NEGATIVE SKIN FRICTION ON PILE GROUP FOR VERTICAL LOADING | en_US |
| dc.type | Thesis | en_US |
