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Load Sharing in Unconnected Piled Rafts of Different Spacings in Clayey Soils |
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PP: 1401-1416 |
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doi:10.18576/amis/180618
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Author(s) |
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M. Y. Fattah,
Karam. Khalifa,
Mohamed Hafez,
N. M. Salim,
Zakaria Che Muda,
Mahammad Mohie Eldin,
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Abstract |
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| When piles are used to reduce raft settlement, significant shear stresses and bending moments can be created. Separate piles are utilized to alleviate concerns about high tensions in piles and rafts. A structural fill sand-gravel cushion in an unconnected piled raft foundation isolates the piles from the raft (UCPR). The cushion redistributes the load between the raft and the piles. This also prevents transferring moments from the raft to the piles. The effect of pile spacing in the foundation settlement and the load-sharing ratios of piles and raft were investigated by using the PLAXIS-3D finite element analysis software. The findings reveal that pile spacing is an important aspect in achieving a higher load ratio in the raft and a uniform load distribution among the piles. the settlement significantly decreases as the pile spacing increases from 2D to 3D, 4D, and 4.5D. The axial stress in the raft is affected by the pile spacing design. The decrease in pile spacing to 2D and 3D makes the raft carries a small ratio of the applied stresses, and with increase of pile spacing to 4D and 4.5D where the piles will cover all area under the raft, the stresses ratio in the raft increases by 25% and 65%, respectively, as compared with the connected piled raft. The pile load sharing ratio decreases by (90%, 90%, 56%, to 44 %) as the pile spacing varies from (2D to 3D to 4D and 4.5D), respectively.
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