Title:
Shear Strengths of Prestressed Concrete Beams Part 2: Comparisons with ACI and AASHTO Provisions
Author(s):
Thomas T. C. Hsu, Arghadeep Laskar, and Y. L. Mo
Publication:
Structural Journal
Volume:
107
Issue:
3
Appears on pages(s):
340-345
Keywords:
beams; prestressed concrete; shear design; shear strength.
DOI:
10.14359/51663699
Date:
5/1/2010
Abstract:
In the previous Part 1 paper, an accurate, yet simple, equation for the shear strengths of prestressed concrete beams was developed. This new equation is a function of the shear span-depth ratio (a/d or M/Vd), the strength of concrete vfc', the web area bwd, and the ?t ratio. New formulas are also proposed for maximum shear strength and for the minimum stirrup requirement. In this Part 2 paper, the new shear design method was compared with the shear provisions of ACI 318-08 and the AASHTO LRFD Specifications using 148 test beams. The proposed method does not take into account the two variables, prestress force, and angle of failure crack, that are involved in the ACI and AASHTO shear provisions. Nevertheless, the proposed method is shown to be not only simple but also more accurate.