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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Investigation of Strut Strength Using a
Author(s): N. Bahen and D.H. Sanders
Publication: Special Publication
Appears on pages(s): 385-404
Keywords: crack control; deep beams; strut-and-tie model; strut strength.
Abstract:Data from 360 deep beam tests was collected from available literature to
perform a strut-and-tie model analysis on each of the beams using a simple deep beam strut-and-tie model. The capacities of bottle-shaped struts in the deep beam strut-and-tie models determined from experimental testing were compared with predicted strut strengths specified by ACI 318-08 and AASHTO LRFD Bridge Design Specifications (AASHTO 2007). For AASHTO LRFD, the comparisons showed that the strut stress provisions are unconservative for concrete strengths greater than 7000 psi (48 MPa). For ACI 318-08, the comparisons showed that the strut stress provisions are unconservative for concrete strengths less than 6000 psi (41 MPa) when used with the minimum amount of crack control reinforcement specified by ACI 318-08 and for concrete strengths greater than 6000 psi (41 MPa) for any amount of
crack control reinforcement. Based on these findings, new strut strength provisions were developed for ACI 318-08 and AASHTO LRFD that provided increased conservatism.
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