الفهرس 
Abstract
Thesis overviewOnly 14 pages are availabe for public view
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Abstract
Piles subjected to tensile forces is an expected loading scenario in bridge foundations and abutments. An extensive review of the literature regarding the subject of tensile loading on a pile in sandy soils is presented. Most available methods are only concerned with the pile ultimate tensile capacity. This thesis presents a methodology to predict the pile-head load vs. displacement curve and the associated mobilized stiffness of a pile embedded into sandy soils based on the pile-soil interaction. The mobilized tensile resistance/displacement of the pile shaft is determined up to failure based on soil and pile properties including the soil stress-strain curve. The proposed technique also provides the t-z curves for piles in sandy soils that can be separately utilized in a combined model for a superstructure/substructure complete solution. A parametric study is conducted using the suggested technique to assess the effect of soil parameters on the pile response under axial tension force. To demonstrate the advantages of the proposed method a comparison between its results and the FHWA (O’Neil and Reese 1999) method is presented. A number of comparisons with full-scale load tests at different sites are also presented to validate the suggested technique. A detailed flowchart is presented to describe the proposed methodology that has been compiled into a computer program. In addition, a finite element model has been developed and validated to compare the results of the presented method with those determined from the finite element analysis. Furthermore, the method adopted by The Egyptian code of practice (2001) and the research recommendations to improve this method has also been presented.