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Author:

Harries, Kent A. (Harries, Kent A..) | Liu, Tianqiao (Liu, Tianqiao.) | Shahrooz, Bahram M. (Shahrooz, Bahram M..) | Miller, Richard A. (Miller, Richard A..) | Castrodale, Reid W. (Castrodale, Reid W..)

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EI SCIE

Abstract:

Strand debonding patterns and release (prestress transfer) practices can result in significant local stresses at prestressed girder ends, which are not accounted for in design. This article presents a numerical and analytic study of various single-webbed prestressed concrete girder shapes for which large amounts of prestressing are necessitated by the use of 0.7 in. (17.8 mm) diameter strands. Shapes with wide bottom flanges are shown to potentially exhibit large stresses that effectively pry, or peel, the portions of the flanges extending from the web away from the web. Such peeling stresses can be mostly mitigated by partially debonding strands in the recommended pattern from the outside in. Similarly, releasing or cutting strands in a uniform manner mitigates peeling stresses. While releasing all strands simultaneously is optimal, it is unlikely to be practical for large prestressed components. For conventional release operations, the results presented in this article indicate that a symmetrical top-down method would not result in significant peeling stress. Moreover, prestressed girder end region detailing requirements aimed at providing adequate flange confinement and strand anchorage at the ultimate limit would be adequate to control peeling stresses, including those resulting from the inadvertent use of a poor release sequence. © 2024 Precast/Prestressed Concrete Institute. All rights reserved.

Keyword:

Concrete bridges Anchorages (concrete construction) Concrete beams and girders Prestressing Debonding Prestressed concrete Concrete construction Prestressed beams and girders

Author Community:

  • [ 1 ] [Harries, Kent A.]The University of Pittsburgh, Pittsburgh; Pa, United States
  • [ 2 ] [Liu, Tianqiao]Beijing University of Technology, China
  • [ 3 ] [Shahrooz, Bahram M.]The University of Cincinnati, Cincinnati; OH, United States
  • [ 4 ] [Miller, Richard A.]The University of Cincinnati, United States
  • [ 5 ] [Castrodale, Reid W.]Castrodale Engineering Consultants, Concord; NC, United States

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Source :

PCI Journal

ISSN: 0887-9672

Year: 2024

Issue: 5

Volume: 69

Page: 27-44

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 12

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