Numerical Evaluation of Bearing Capacity of Step-Tapered Piles Using PY Curves Analysis

Shafaghat, A; Khabbaz, H

Numerical Evaluation of Bearing Capacity of Step-Tapered Piles Using PY Curves Analysis

Shafaghat, A

Khabbaz, H

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Publisher:: Springer
Publication Type:: Chapter
Citation:: Advancements in Geotechnical Engineering, 2021, pp. 200-212
Issue Date:: 2021-08-22

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Field	Value	Language
dc.contributor.author	Shafaghat, A https://orcid.org/0000-0003-4424-5475
dc.contributor.author	Khabbaz, H
dc.date.accessioned	2023-01-05T02:28:47Z
dc.date.available	2023-01-05T02:28:47Z
dc.date.issued	2021-08-22
dc.identifier.citation	Advancements in Geotechnical Engineering, 2021, pp. 200-212
dc.identifier.isbn	978-3-030-62907-6
dc.identifier.uri	http://hdl.handle.net/10453/164716
dc.description.abstract	Step-tapered piles are those with a larger top diameter, and a smaller diameter at lower sections as the body gets slender stepwise from top to toe in one or some steps. This study aims to investigate the behaviour of step-tapered piles having only one step under axial loading condition. Three series of piles embedded in sand are examined numerically using the three-dimensional finite element method. Each set consists of five piles, including one reference straight sided wall pile and four step-tapered piles having the same volume. Different internal friction angles of 33°, 37°, 41° (to represent loose, medium and dense sands, respectively) and corresponding elastic modulus and lateral earth pressure coefficients are considered to observe their effect on the bearing capacity and settlement of piles. The load-displacement diagram of each pile is obtained, and accordingly, the frictional and end bearing resistances are calculated using conventional methods. A MATLAB code is developed to get the numerical data and carry out the calculations. Moreover, the normal and shear stress states, plastic points, and deformations around the step and toe of piles are computed and compared. According to the results, the advantages of step-tapered piles over their counterpart cylindrical ones in terms of bearing capacity and settlement are discussed. Finally, the optimum stepped length of the pile is determined.
dc.format.extent	16
dc.language	en
dc.publisher	Springer
dc.relation.ispartof	Advancements in Geotechnical Engineering
dc.relation.ispartofseries	Sustainable Civil Infrastructures
dc.relation.isbasedon	10.1007/978-3-030-62908-3_15
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Numerical Evaluation of Bearing Capacity of Step-Tapered Piles Using PY Curves Analysis
dc.type	Chapter
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Teaching and Learning)
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2023-01-05T02:28:44Z
pubs.place-of-publication	Switzerland
pubs.publication-status	Published
dc.location	Switzerland

Abstract:

Step-tapered piles are those with a larger top diameter, and a smaller diameter at lower sections as the body gets slender stepwise from top to toe in one or some steps. This study aims to investigate the behaviour of step-tapered piles having only one step under axial loading condition. Three series of piles embedded in sand are examined numerically using the three-dimensional finite element method. Each set consists of five piles, including one reference straight sided wall pile and four step-tapered piles having the same volume. Different internal friction angles of 33°, 37°, 41° (to represent loose, medium and dense sands, respectively) and corresponding elastic modulus and lateral earth pressure coefficients are considered to observe their effect on the bearing capacity and settlement of piles. The load-displacement diagram of each pile is obtained, and accordingly, the frictional and end bearing resistances are calculated using conventional methods. A MATLAB code is developed to get the numerical data and carry out the calculations. Moreover, the normal and shear stress states, plastic points, and deformations around the step and toe of piles are computed and compared. According to the results, the advantages of step-tapered piles over their counterpart cylindrical ones in terms of bearing capacity and settlement are discussed. Finally, the optimum stepped length of the pile is determined.

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http://hdl.handle.net/10453/164716