ACI 445.1R-12: Report on Torsion in Structural Concrete


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Students Click Here. Related Projects. Home Forums Structural Engineers Activities Structural engineering general discussion Forum Length of a concrete grade beam with torsion. I have an existing pile supported grade beam with no apparent interior resistance to torsion along its feet of length.


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The grade beam has steel pipe pile supports centered with the grade beam and spaced at approximately At each end of the foot grade beam length there are large multi pile, pile caps. The grade beams are 42 inches wide x 60 inches deep including the pile embedment. The bottom steel is about 7. Vehicles intended to be moved over the grade beam can exert as much as K of factored vertical force spread over 2 closely spaced axles with 4 wheels each. The factored torsion is as high as ft-kips, and torsion stirrups as well as longitudinal torsion reinforcement must be considered.

I have difficulty believing that the piles can resist the torsional forces with such little embedment in the grade beam, and the details of the pile installation do not indicate development bars from the piles into the grade beam.

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Soils in other areas of the building have settled several inches below the pile supported concrete. Is there any information that limits the length of a grade beam when torsion is considered. Is the grade beam connected to a structural concrete slab at the top?

10- (Beams) Design of Beams due to Torsion (2016) page 009

Seems like it might be if vehicles are to drive over it. Seems to me that the presence of a slab would constitute torsional restraint, if it exists. I really don't fully understand your problem but probably is my fault Could you please provide a sketch? Where do the torsional loads on the beam come from?

Which other loads are acting on the beam? Is the torsional resistance really required for equilibrium or is it just a torsional compatibility problem? If there is indeed torsion to be contended with, I believe that your concerns regarding the pile to grade beam are quite valid. I've explored a similar issue in this thread that may interest you: Link.

L’ACI pubblica il “ Manual of Concrete Practice”

I know of no maximum length limitation. Abstract: A clear understanding of the effects of torsion on concrete members is essential to the safe, economical design of reinforced and prestressed concrete members.

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This report begins with a brief and systematic summary of the year history of torsion of structural concrete members, new and updated theories and their applications, and a historical overview outlining the development of research on torsion of structural concrete members. The behavior of members subjected to torsion combined with bending moment, axial load, and shear is discussed.

International Concrete Abstracts Portal

This report deals with design issues, including compatibility torsion, spandrel beams, torsional limit design, open sections, and size effects. The final two chapters are devoted to the detailing requirements of transverse and longitudinal reinforcement in torsional members with detailed, step-by-step design examples for two beams under torsion using ACI ACI , European EC , and Canadian Standards Association CSA-A Two design examples are given to illustrate the steps involved in torsion design.

Design Example 1 is a rectangular reinforced concrete beam under pure torsion, and Design Example 2 is a prestressed concrete girder under combined torsion, shear, and flexure. ACI Materials Journal.

ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete
ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete
ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete
ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete
ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete
ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete
ACI 445.1R-12: Report on Torsion in Structural Concrete ACI 445.1R-12: Report on Torsion in Structural Concrete

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