Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings

This paper presents a practical, accurate, and reasonably conservative procedure for the design and analysis of drilled shaft footings, also referred to as pile caps. A database of drilled shaft footing tests was compiled from the literature to evaluate the accuracy of an existing design guide based...

ver descrição completa

Detalhes bibliográficos
Autores: Yi, Yousun, Kim, Hyunsu, Choi, Jongkwon, Murcia Delso, Juan|||0000-0001-6424-7262, Hrynyk, Trevor, Bayrak, Oguzhan
Tipo de documento: artigo
Data de publicação:2025
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositório:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglês
OAI Identifier:oai:upcommons.upc.edu:2117/455195
Acesso em linha:https://hdl.handle.net/2117/455195
https://dx.doi.org/10.1061/JSENDH.STENG-13976
Access Level:Acceso aberto
Palavra-chave:Drilled shaft footings
3D strut-and-tie method (STM)
Strength estimation
Design conservatism
Design method enhancements
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
id ES_62bbb2b956d6b60d97e58e1241f847d9
oai_identifier_str oai:upcommons.upc.edu:2117/455195
network_acronym_str ES
network_name_str España
repository_id_str
spelling Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footingsYi, YousunKim, HyunsuChoi, JongkwonMurcia Delso, Juan|||0000-0001-6424-7262Hrynyk, TrevorBayrak, OguzhanDrilled shaft footings3D strut-and-tie method (STM)Strength estimationDesign conservatismDesign method enhancementsÀrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigóThis paper presents a practical, accurate, and reasonably conservative procedure for the design and analysis of drilled shaft footings, also referred to as pile caps. A database of drilled shaft footing tests was compiled from the literature to evaluate the accuracy of an existing design guide based on the three-dimensional (3D) strut-and-tie method (STM). It was concluded that strength estimations obtained with the existing 3D STM-based design guidelines were excessively conservative, and the accuracy of the method varied with key design parameters such as strut inclination and drilled shaft size. Key enhancements to the 3D STM are proposed to resolve existing limitations and ambiguities, including the definition of tie area for bottom mat reinforcement, 3D nodal geometry, nodal strength, concrete efficiency factor, and tie anchorage checks. These recommendations are supported by experimental evidence, including data from large-scale footing tests recently conducted by the authors, and are consistent with current design code provisions. The proposed method provides more accurate (less conservative) and less scattered (more reliable) strength estimations as compared to the existing recommendation. Lastly, a complete design example of a drilled shaft footing subjected to different loading scenarios is provided in the Supplemental MaterialsThe Texas Department of Transportation (TxDOT), which provided funding for this research through Project 0-6953, is acknowledged and gratefully appreciated by the authors. The conclusions and recommendations presented in this study are those of the authors and may not represent TxDOT’s perspectives.Peer ReviewedAmerican Society of Civil Engineers (ASCE)20252025-07-0120262026-02-13journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/455195https://dx.doi.org/10.1061/JSENDH.STENG-13976reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4551952026-05-27T15:37:01Z
dc.title.none.fl_str_mv Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
title Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
spellingShingle Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
Yi, Yousun
Drilled shaft footings
3D strut-and-tie method (STM)
Strength estimation
Design conservatism
Design method enhancements
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
title_short Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
title_full Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
title_fullStr Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
title_full_unstemmed Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
title_sort Evaluation and proposal of Strut-and-Tie Method for the design of drilled shaft footings
dc.creator.none.fl_str_mv Yi, Yousun
Kim, Hyunsu
Choi, Jongkwon
Murcia Delso, Juan|||0000-0001-6424-7262
Hrynyk, Trevor
Bayrak, Oguzhan
author Yi, Yousun
author_facet Yi, Yousun
Kim, Hyunsu
Choi, Jongkwon
Murcia Delso, Juan|||0000-0001-6424-7262
Hrynyk, Trevor
Bayrak, Oguzhan
author_role author
author2 Kim, Hyunsu
Choi, Jongkwon
Murcia Delso, Juan|||0000-0001-6424-7262
Hrynyk, Trevor
Bayrak, Oguzhan
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Drilled shaft footings
3D strut-and-tie method (STM)
Strength estimation
Design conservatism
Design method enhancements
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
topic Drilled shaft footings
3D strut-and-tie method (STM)
Strength estimation
Design conservatism
Design method enhancements
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
description This paper presents a practical, accurate, and reasonably conservative procedure for the design and analysis of drilled shaft footings, also referred to as pile caps. A database of drilled shaft footing tests was compiled from the literature to evaluate the accuracy of an existing design guide based on the three-dimensional (3D) strut-and-tie method (STM). It was concluded that strength estimations obtained with the existing 3D STM-based design guidelines were excessively conservative, and the accuracy of the method varied with key design parameters such as strut inclination and drilled shaft size. Key enhancements to the 3D STM are proposed to resolve existing limitations and ambiguities, including the definition of tie area for bottom mat reinforcement, 3D nodal geometry, nodal strength, concrete efficiency factor, and tie anchorage checks. These recommendations are supported by experimental evidence, including data from large-scale footing tests recently conducted by the authors, and are consistent with current design code provisions. The proposed method provides more accurate (less conservative) and less scattered (more reliable) strength estimations as compared to the existing recommendation. Lastly, a complete design example of a drilled shaft footing subjected to different loading scenarios is provided in the Supplemental Materials
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-07-01
2026
2026-02-13
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/455195
https://dx.doi.org/10.1061/JSENDH.STENG-13976
url https://hdl.handle.net/2117/455195
https://dx.doi.org/10.1061/JSENDH.STENG-13976
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Society of Civil Engineers (ASCE)
publisher.none.fl_str_mv American Society of Civil Engineers (ASCE)
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869409519403008000
score 15.812429

Registros relacionados