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Title: Shear Behavior of Pretensioned High-Strength Concrete Bridge I-Girders

Author(s): Zhongguo (John) Ma, Maher K. Tadros, and Mantu Baishya

Publication: Structural Journal

Volume: 97

Issue: 1

Appears on pages(s): 185-192

Keywords: high-strength concretes; reinforcing steels; shear properties; welded wire fabric.

DOI: 10.14359/848

Date: 1/1/2000

Abstract:
Due to the optimization of I-girder shapes for maximum flexural efficiency and increasing use of high-strength concrete (HSC), shear strength control of member design is becoming more common. AASHTO Standard Specifications require that Vs not exceed 8 bwd (fc¢ in psi), otherwise the section web must be widened or the depth increased. On the other hand, AASHTO LRFD Specifications require a maximum shear limit of 0.25fc¢bwdv. The difference between the two limits may be as high as 100%. The purpose of this research is to theoretically and experimentally establish a limit on shear capacity before member size must be increased. Full-scale experiments have shown that the limit on shear capacity specified in the LRFD Specifications can be reached. A key factor is anchorage of the longitudinal flexural reinforcement at the member end.


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Electronic Structural Journal