Title:
Design of Deep Beams Using Strut-and-Tie Models--Part II: Design Recommendations
Author(s):
Michael D. Brown and Oguzhan Bayrak
Publication:
Structural Journal
Volume:
105
Issue:
4
Appears on pages(s):
405-413
Keywords:
efficiency factor; structural concrete, strut-and-tie modeling
DOI:
10.14359/19854
Date:
7/1/2008
Abstract:
Based on the findings of Part I of this study, the use of current strut-and-tie modeling provisions of both ACI 318-05 and AASHTO LRFD can lead to an unconservative calculation of nominal capacities for some test specimens. New provisions were developed based on the lower bound to a database of 596 published test results. These new provisions incorporate the effects of strut inclination, concrete strength, geometry of a bottleshaped strut, and shear reinforcement while increasing levels of conservatism relative to ACI 318 and AASHTO LRFD provisions. The use of the new design method results in unconservative nominal capacities for only 5% of the specimens in the database.