New ACI publication aids in the design of
structural concrete using strut-and-tie models
FARMINGTON HILLS, Mich.—With the addition of the new Appendix A on strut-and-tie models in ACI 318-02,
"Building Code Requirements for Structural Concrete," engineers have an alternative code procedure to design
structural concrete members where the usual sectional design assumptions for flexure and shear do not apply.
Now there's a new publication that can help engineers apply this valuable design tool in daily practice.
Examples for the Design of Structural Concrete with Strut-and-Tie Models (SP-208) contains selected
papers presented at the 2002 ACI Fall Convention in Phoenix by members of ACI Subcommittee 445-A, Shear
and Torsion: Strut-and-Tie Models. The publication's primary purpose is to show engineers how to apply
strut-and-tie modeling according to Appendix A. These papers will also give you insight into the development
of Appendix A of ACI 318-02 and summarize important tests that confirm strut-and-tie modeling as a rational
basis for the design of structural concrete.
"Strut-and-tie models are an excellent analysis tool for many design problems in concrete
structures, and especially for discontinuity regions (D-regions)," says Karl-Heinz Reineck,
editor of SP-208 and Chair of Subcommittee 445-A. "Where not properly analyzed and detailed,
these regions can show damage or even result in brittle failure of the structure, as demonstrated by many cases."
SP-208 presents examples ranging from classical D-regions to unusual design situations, including:
- Deep beams (with and without openings)
- Dapped-end T-beam supported by an inverted T-beam
- Corbels (double and at column)
- Beam with indirect support and loading
- Prestressed beams
- Cable-stayed bridge pier table
- High wall with two openings
- Pile caps
Most of the examples have been taken from practice. In addition to explaining the
approach of determining a model, they point out where problems can occur in dimensioning
or in detailing and anchoring of the reinforcement and how the design could be improved.
The implementation of strut-and-tie-models in ACI 318-02 is a significant step toward more
consistent design of structural concrete. SP-208 expands on the rules and guidelines
given in the commentary to Appendix A by showing engineers how to apply these models in a
variety of situations. The cost of this 244-page special publication is $32 for
ACI members ($53.50 for nonmembers). For more information or to order, call 248-848-3800 or
visit ACI's online bookstore at www.concrete.org.
Developing and disseminating information on the best use of concrete has been the mission of
ACI International for nearly a century. Founded in 1904, the international technical and
educational society, headquartered in Farmington Hills, Mich., has 30,000 members and 94
chapters in 30 countries. ACI offers 14 certification programs for concrete practitioners,
conducts more than 200 educational seminars annually, and produces more than 400 technical
documents for improving the design, construction, maintenance, and repair of concrete structures.
### Contact:
Dale Thomas
American Concrete Institute
38800 Country Club Drive
Farmington Hills, MI. 48331
Phone: 248.848.3716
Fax: 248.848.3825
E-mail: dale.thomas@concrete.org
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