Plain Concrete Underreams for Drilled Shafts

by J. Steven Farr, (A.M.ASCE), Engr.; Kentucky Foundation Drilling Co., Louisville, Ky.,
Lymon C. Reese, (F.ASCE), T.U. Taylor Prof. of Civ. Engrg.; Coll. of Engrg., Univ. of Texas, Austin, Tex.,

Serial Information: Journal of the Structural Division, 1980, Vol. 106, Issue 6, Pg. 1329-1341

Document Type: Journal Paper


Model studies were performed and the finite element method was used to develop preliminary design curves for plain concrete underreams. The factors considered in developing the curves were: the strength of concrete, the geometry of the bell, and the assumed distribution of bearing stress. The curves are designated as preliminary because an empirical correlation had to be made between analysis and experiment; however, in the absence of any previous design procedure the curves should be useful as a guide to the design of underreams.

Subject Headings: Curvature | Concrete | Drilled shafts | Shafts | Finite element method | Stress distribution | Strength of materials | Geometrics

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