Ultimate Strength of Prestressed Concrete Piles and Columns

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Title: Ultimate Strength of Prestressed Concrete Piles and Columns

Author(s): Arthur R. Anderson and Saad E. Moustfa

Publication: Journal Proceedings

Volume: 67

Issue: 8

Appears on pages(s): 620-635

Keywords: axial loads; bending; bridge foundations;columns (supports) ; compressive strength;computer programs; concrete piles.

Date: 8/1/1970

Abstract:
This paper deals with the ultimate strength of prestressed concrete prismatic sections subjected to axial loads and bending. Although the techniques developed are applicable to prestressed concrete columns in general, the potential for practical application is mainly related to the design of prestressed concrete piles, which function structurally as a special case of reinforced concrete columns. The full potential of prestressed concrete piles has not been recognized by structural designers because readily applicable criteria based on ultimate loads and moments for design have not been available. This paper contains interaction diagrams for the ultimate capacity of a series of standard prestressed concrete piles produced in the Pacific Northwest. These piles are furnished in concrete strengths of 6000, 7000, and 8000 psi, all stressed to an effective prestress level of 1200 psi. Applications of the interaction diagrams to design are included, and a comparison of the ultimate strength of prestressed concrete piles predicted by the authors’ method is made with previously published work. The construction of the interaction diagrams is explained, and the computer program used for the construction is included in the paper.