3D Strut-and-Tie Modeling for Design of Drilled Shaft Footings Under Biaxial Eccentric Loading

Yi, Yousun; Hyunsu, Kim; Wang, Hwa-Ching; Webb, Zachary D; Bayrak, Oguzhan; University of Texas at Austin. Center for Transportation Research

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3D Strut-and-Tie Modeling for Design of Drilled Shaft Footings Under Biaxial Eccentric Loading

2022-08-01
By Yi, Yousun ; Hyunsu, Kim ; Wang, Hwa-Ching ; ...

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Creators:

Yi, Yousun ; Hyunsu, Kim ; Wang, Hwa-Ching ; Webb, Zachary D ; Bayrak, Oguzhan

Yi, Yousun ; Hyunsu, Kim ; Wang, Hwa-Ching ; Webb, Zachary D ; Bayrak, Oguzhan Less -
Corporate Creators:

University of Texas at Austin. Center for Transportation Research
Corporate Contributors:

Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration

Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Bearings Biaxial Eccentric Load Biaxial Stress Drilled Shaft Footings Footings Strength Of Materials Strut-and-Tie Modeling Strut And Tie Method
Publication/ Report Number:

FHWA/TX-22/0-6953-01-1
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Technical Report, October 2021 – June 2022
Corporate Publisher:

University of Texas at Austin. Center for Transportation Research
Abstract:

This project establishes a series of design guidelines for drilled shaft footings subjected to biaxial eccentric loading by refining the design recommendations of TxDOT Project 0-6953. The refined guidelines include the single strut– and single tie–based equivalent force system, development of 3D strut-and-tie models for biaxial eccentric loading scenarios, and definitions of the 3D nodal geometry of the CCC node. The refinements were carried out from a conservative perspective. Nevertheless, they maintained most of the approaches of the previous design recommendations for a consistent design of drilled shaft footings under different loading conditions. The design of the drilled shaft footing developed in TxDOT Project 0-6953 was further updated with two additional biaxial eccentric load cases, applied to footings in use by TxDOT... • Load Case VI: Axial compression combined with moderate biaxial flexure. The load combination induces tension at one corner of the column and non-uniform compression in drilled shafts • Load Case VII: Axial compression combined with large biaxial flexure. The load combination induces tension at one corner of the column and one of four drilled shafts. The updated drilled shaft footing design example was also confirmed to be safe for the selected biaxial eccentric design load cases through the refined design recommendations of this research. The design example from this research, which was safe even for extreme biaxial load cases, validates the conservativeness of the proposed refinements.
Format:

PDF
Funding:

0-6953-01
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:4a6d499b5f43f98e1dc07455cbcb7e2cc0d3b296e85b4d03acd2e88310388d13
Download URL:

https://rosap.ntl.bts.gov/view/dot/64200/dot_64200_DS1.pdf
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3D Strut-and-Tie Modeling for Design of Drilled Shaft Footings Under Biaxial Eccentric Loading

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