Graduate Thesis Or Dissertation
 

Biaxial bending of concrete members with applications to prestressed concrete power poles

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  • A method of analysis of arbitrarily shaped prestressed concrete members for biaxial bending is given. The stress-strain curve of the concrete is represented by two parabolic segments, and the effects of strain hardening of the steel are included in the analysis. An iterative numerical procedure is used to solve for the position of the neutral axis and the curvature corresponding to a given axial force and bending moment. This procedure is used as a basis for calculating the deflections of a cantilever member by Newmark's method. No consideration is given to time dependent effects nor to the possibility of failure other than in pure flexure. Theoretical curvatures, deflections and ultimate moments are compared with results obtained from the testing of three I-shaped prestressed concrete power poles. Good correlation was obtained between computed and measured behavior of the specimens tested. Ultimate moments were extremely well predicted. Listings of the computer programs used in the analysis are included.
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