Location
Chicago, Illinois
Date
01 May 2013, 2:00 pm - 4:00 pm
Abstract
To achieve engineered designs with consistent levels of reliability, the Federal Highway Administration (FHWA) mandated that all new bridges initiated after October 1, 2007, including those founded upon drilled shafts, be designed according to the Load and Resistance Factor Design (LRFD) approach. As the first step in developing efficient regional LRFD procedures for drilled shafts, the Drilled SHAft Foundation Testing (DSHAFT) database was formulated. DSHAFT was aimed at assimilating high quality, historical drilled shaft test data from Iowa and the surrounding states, and it presently contains data from 41 drilled shaft load tests, 38 of which are O-cell load tests, along with subsurface information and structural details. Following an introduction to DSHAFT, several challenges associated with subsurface investigations, measurement of geomaterial properties, and test methods employed in current practice for drilled shaft capacity estimations are discussed. An improved procedure is then proposed featuring three different cases for establishing the equivalent top load-displacement response of drilled shafts. Using the proposed procedure and LRFD framework, it is shown that robust, more efficient regional LRFD resistance factors can be established for drilled shafts with a target displacement limit.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
7th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2013 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Ng, Kam; Garder, Jessica; Sritharan, Sri; and Ashlock, Jeramy, "An Investigation of Load and Resistance Factor Design of Drilled Shafts Using Historical Field Test Data" (2013). International Conference on Case Histories in Geotechnical Engineering. 5.
https://scholarsmine.mst.edu/icchge/7icchge/session01/5
An Investigation of Load and Resistance Factor Design of Drilled Shafts Using Historical Field Test Data
Chicago, Illinois
To achieve engineered designs with consistent levels of reliability, the Federal Highway Administration (FHWA) mandated that all new bridges initiated after October 1, 2007, including those founded upon drilled shafts, be designed according to the Load and Resistance Factor Design (LRFD) approach. As the first step in developing efficient regional LRFD procedures for drilled shafts, the Drilled SHAft Foundation Testing (DSHAFT) database was formulated. DSHAFT was aimed at assimilating high quality, historical drilled shaft test data from Iowa and the surrounding states, and it presently contains data from 41 drilled shaft load tests, 38 of which are O-cell load tests, along with subsurface information and structural details. Following an introduction to DSHAFT, several challenges associated with subsurface investigations, measurement of geomaterial properties, and test methods employed in current practice for drilled shaft capacity estimations are discussed. An improved procedure is then proposed featuring three different cases for establishing the equivalent top load-displacement response of drilled shafts. Using the proposed procedure and LRFD framework, it is shown that robust, more efficient regional LRFD resistance factors can be established for drilled shafts with a target displacement limit.
