الفهرس 
BACKGROUND AND LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
Several tall structures like dock-fendering systems, abutments, marine
dolphins, transmission towers, and high-rise platforms that constitute large uplift loads are installed on deep foundations. This research, introduce a pile modification strategy to improve conventional piles and the modified pile is described as finned pile. This modification increases the capacity of tension pile by providing 4 fins welded around the bottom perimeter of the pile. Axial static tension loading for different pile groups and different spacing’s were implemented experimentally. All the sets of tests were performed at constant fin
width, fin length, number of fins, embedment depth, and pile diameter to
evaluate the efficiency of the pile-modification strategy. The experimental study aimed to investigate the uplift capacity and displacement for the pile groups with/without fins. In addition, the effect of the sand relative density (Dr) of 30, 50, and 80%, pile depth, and fin geometry was investigated. The test results for the model were verified using the PLAXIS 3D Foundation as a numerical program. Beside static load, there were parameters varied to evaluate their effects on the uplift capacity of finned pile groups under cyclic tension and compression load. According to the results, the uplift capacities of the finned pile groups compared with conventional piles without fins were significantly increase. The finned pile’s ultimate uplift capacity of group, increases with increasing of the
inter-pile spacing. The finned pile’s ultimate uplift capacity of group, increases with increasing the number of piles. Also, increasing the piles number influenced resistance in both tension and compression cyclic load significantly.