Database Calibration of Design Methods and LRFD Resistance Factors for Auger Cast-in-Place and Drilled Displacement Piles.
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| Title: | Database Calibration of Design Methods and LRFD Resistance Factors for Auger Cast-in-Place and Drilled Displacement Piles. |
|---|---|
| Authors: | Tang, Chong1 (AUTHOR) ceetc@dlut.edu.cn, Peng, Zhongzheng2 (AUTHOR) pengzhongzheng@mail.dlut.edu.cn, Phoon, Kok-Kwang3 (AUTHOR) kkphoon@sutd.edu.sg, Samtani, Naresh C.4 (AUTHOR) naresh@ncsgeoresources.com |
| Source: | Journal of Geotechnical & Geoenvironmental Engineering. Jul2026, Vol. 152 Issue 7, p1-26. 26p. |
| Subject Terms: | *Bored piles, *Load factor design, *Soil-structure interaction, *Bearing capacity of soils, *Bridge design & construction |
| Company/Entity: | American Association of State Highway & Transportation Officials |
| Abstract: | Auger cast-in-place (ACIP) and drilled displacement (DD) piles are routinely considered as an alternative to drilled shafts or driven piles. However, their acceptance to support bridges has been lagging. The load and resistance factor design (LRFD) procedures in the bridge design specifications of the American Association of State Highway and Transportation Officials (AASHTO) do not address ACIP and DD piles. To fill this gap, a load test database DUT/CFA/836 is developed in this paper, including 615 ACIP piles and 221 DD piles. The load tests in DUT/CFA/836 are analyzed from three aspects: (1) determine the bearing capacity of piles (Qfi) based on the measured load-displacement (Qt-w) curves by three methods in the International Building Code for comparison purposes; (2) calculate the bearing capacity of piles (Ruc) by 23 methods based on soil parameters (indirect) or in situ test data (direct); and (3) predict the Qt-w curves by seven sets of nonlinear t-z and q-w models to account for the load transfers in shaft shearing and end bearing, respectively. For each quantity of interest—bearing capacity, permissible load, and displacement at a service load—the bias and scatter of the predictions are characterized by the mean and coefficient of variation (COV) of the ratio of measured (or interpreted) to calculated values (called model factor). Following the AASHTO LRFD methodology, the values of the mean and COV of the capacity model factor are used to calibrate the LRFD resistance factors for ACIP and DD piles at the Strength I limit state. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 193805207 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Database Calibration of Design Methods and LRFD Resistance Factors for Auger Cast-in-Place and Drilled Displacement Piles. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Tang%2C+Chong%22">Tang, Chong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ceetc@dlut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Peng%2C+Zhongzheng%22">Peng, Zhongzheng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> pengzhongzheng@mail.dlut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Phoon%2C+Kok-Kwang%22">Phoon, Kok-Kwang</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> kkphoon@sutd.edu.sg</i><br /><searchLink fieldCode="AR" term="%22Samtani%2C+Naresh+C%2E%22">Samtani, Naresh C.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> naresh@ncsgeoresources.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geotechnical+%26+Geoenvironmental+Engineering%22">Journal of Geotechnical & Geoenvironmental Engineering</searchLink>. Jul2026, Vol. 152 Issue 7, p1-26. 26p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Bored+piles%22">Bored piles</searchLink><br />*<searchLink fieldCode="DE" term="%22Load+factor+design%22">Load factor design</searchLink><br />*<searchLink fieldCode="DE" term="%22Soil-structure+interaction%22">Soil-structure interaction</searchLink><br />*<searchLink fieldCode="DE" term="%22Bearing+capacity+of+soils%22">Bearing capacity of soils</searchLink><br />*<searchLink fieldCode="DE" term="%22Bridge+design+%26+construction%22">Bridge design & construction</searchLink> – Name: SubjectCompany Label: Company/Entity Group: Su Data: <searchLink fieldCode="DE" term="%22American+Association+of+State+Highway+%26+Transportation+Officials%22">American Association of State Highway & Transportation Officials</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Auger cast-in-place (ACIP) and drilled displacement (DD) piles are routinely considered as an alternative to drilled shafts or driven piles. However, their acceptance to support bridges has been lagging. The load and resistance factor design (LRFD) procedures in the bridge design specifications of the American Association of State Highway and Transportation Officials (AASHTO) do not address ACIP and DD piles. To fill this gap, a load test database DUT/CFA/836 is developed in this paper, including 615 ACIP piles and 221 DD piles. The load tests in DUT/CFA/836 are analyzed from three aspects: (1) determine the bearing capacity of piles (Qfi) based on the measured load-displacement (Qt-w) curves by three methods in the International Building Code for comparison purposes; (2) calculate the bearing capacity of piles (Ruc) by 23 methods based on soil parameters (indirect) or in situ test data (direct); and (3) predict the Qt-w curves by seven sets of nonlinear t-z and q-w models to account for the load transfers in shaft shearing and end bearing, respectively. For each quantity of interest—bearing capacity, permissible load, and displacement at a service load—the bias and scatter of the predictions are characterized by the mean and coefficient of variation (COV) of the ratio of measured (or interpreted) to calculated values (called model factor). Following the AASHTO LRFD methodology, the values of the mean and COV of the capacity model factor are used to calibrate the LRFD resistance factors for ACIP and DD piles at the Strength I limit state. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1061/JGGEFK.GTENG-13451 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 26 StartPage: 1 Subjects: – SubjectFull: Bored piles Type: general – SubjectFull: Load factor design Type: general – SubjectFull: Soil-structure interaction Type: general – SubjectFull: Bearing capacity of soils Type: general – SubjectFull: Bridge design & construction Type: general – SubjectFull: American Association of State Highway & Transportation Officials Type: general Titles: – TitleFull: Database Calibration of Design Methods and LRFD Resistance Factors for Auger Cast-in-Place and Drilled Displacement Piles. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Tang, Chong – PersonEntity: Name: NameFull: Peng, Zhongzheng – PersonEntity: Name: NameFull: Phoon, Kok-Kwang – PersonEntity: Name: NameFull: Samtani, Naresh C. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 10900241 Numbering: – Type: volume Value: 152 – Type: issue Value: 7 Titles: – TitleFull: Journal of Geotechnical & Geoenvironmental Engineering Type: main |
| ResultId | 1 |
