Design of UHPC prestressed girders for shear

Breakthrough technology of ultra‐high‐performance concrete (UHPC) introduced in the 1990s exhibits several exceptional mechanical properties that are advantageous in elements of bridge applications. Extensive research has aimed to industrialize UHPC and develop design models. This paper investigates...

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Bibliographic Details
Published in:Structural concrete : journal of the FIB 2024-04, Vol.25 (2), p.780-795
Main Authors: Foster, Stephen J., Bentz, Evan
Format: Article
Language:English
Subjects:
design
Design factors
Field theory
Girders
Mechanical properties
Model accuracy
Prestressed concrete
Reliability analysis
Safety factors
Shear
steel fiber
Structural reliability
UHPC
Ultra high performance concrete
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Summary:Breakthrough technology of ultra‐high‐performance concrete (UHPC) introduced in the 1990s exhibits several exceptional mechanical properties that are advantageous in elements of bridge applications. Extensive research has aimed to industrialize UHPC and develop design models. This paper investigates several design models for shear, including a unified approach with that of conventional concrete based on the modified compression field theory (MCFT). An experimental database of UHPC prestressed concrete girders subjected to shear failure is compiled to evaluate model accuracy and a reliability study is conducted to establish appropriate safety factors. The analysis demonstrates that the proposed MCFT‐based model aligns well with experimental results, exhibiting a suitable level of conservatism for design. A reliability assessment of a typical prestressed girder designed according to Canadian Standards Association building and bridge loadings is performed, resulting in a structural reliability evaluation against a target reliability index. The study recommends specific strength reduction and safety factors for design approaches using UHPC.
ISSN:1464-4177
1751-7648
DOI:10.1002/suco.202300738