Title: Shear Design of Stemmed Bridge Members: How Complex Should It Be?
Date: September-October, 1997
Volume: 42
Issue: 5
Page number: 88-93
Author(s): Zhongguo (John) Ma, Mohsen A. Saleh, Maher K. Tadros
https://doi.org/10.15554/pcij.09011997.88.93

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Abstract

Shear design methods for prestressed concrete beams are becoming unnecessarily complicated because of the complex procedures to determine the concrete contribution, Vc Using a two-span l-beam and a  single span box beam example bridge, it is shown that varying the Vc value from the simplest 1979 AASHTO Interim method of calculating Vc to the most complicated AASHTO LRFD iteration procedure  changes the cost of the beam by not more than 1 percent.

References

1. Shahawy, Mohsen A., and Batchelor, B., "Shear Behavior of Full-Scale Prestressed Concrete Girders: Comparison Between AASHTO Specifications and LRFD Code," PCI JOURNAL, V. 41 , No. 3,  May-June 1996, pp. 48-62. See also Reader Comments by Kri s G. Bassi, Michael P. Collins, John M. Kulicki , Scott R. Eshenaur, and Andrew L. Thomas, PCI JOURNAL, V. 42, No. 3, May-June  1997, pp. 72-93. 

2. AASHTO, Interim Specifications for Bridges, American Association of State Highway and Transportation Officials, Washington, D.C., 1979.

3. AASHTO LRFD, Bridge Design Specifications, First Edition, American Association of State Highway and Transportation Officials, Washington, D.C., 1994.

4. AASHTO, Standard Specifications for Highway Bridges, 16th Edition, American Association of State Highway and Transportation Officials, Washington, D.C., 1996.

5. Collins, M. P. , and Mitchell, D., Prestressed Concrete Structures, Prentice Hall, Englewood Cliffs , NJ, 1991, 766 pp.

6. Collins, M. P., and Mitchell, D., "Shear and Torsion Design of Prestressed and Non-Prestressed Concrete Beams," PCI JOURNAL, V. 25, No. 5, SeptemberOctober 1980, pp. 32-100.

7. AASHTO, Guide Specifications for Design and Construction of Segmental Concrete Bridges, American Association of State Highway and Transportation Officials, Washington, D.C., 1989.