Top Bar Effects in Prestressed Concrete Piles

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Title: Top Bar Effects in Prestressed Concrete Piles

Author(s): Baolin Wan, Michael F. Petrou, Kent A. Harries, and Aly A. Hussein

Publication: Structural Journal

Volume: 99

Issue: 2

Appears on pages(s): 208-214

Keywords: bar; pile; prestressed concrete; slip.

DOI: 10.14359/11546

Date: 3/1/2002

Abstract:
The top bar effect in reinforced concrete is a widely recognized phenomenon. Currently, the ACI Building Code prescribes a 30% increase in the development length of top cast reinforcing bars. No such provision is required for strands in prestressed concrete members. In this paper, the top bar effect for prestressing strands is introduced. Parameters affecting top bar phenomena in prestressed concrete piles are identified, and strategies for reducing this effect are presented. Finally, for the first time, the application of a top bar effect factor for prestressed concrete development length calculations, similar to the one applied in reinforced concrete structural elements, is proposed.


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Electronic Structural Journal



  

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