ACI-445.1R-12 Report on Torsion in Structural Concrete
ACI-445.1R-12 Report on Torsion in Structural Concrete offers a clear understanding that the effects of torsion on concrete members is essential to the safe, economical design of reinforced and prestressed concrete members. This report begins with a brief and systematic summary of the 180-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. Historical theories and truss models include classical theories of Navier, Saint-Venant, and Bredt; the three-dimensional (3-D) space truss of Rausch; the equilibrium (plasticity) truss model of Nielson as well as Lampert and Thürlimann; the compression field theory (CFT) by Collins and Mitchell; and the softened truss model (STM) by Hsu and Mo.
This report emphasizes that it is essential to the analysis of torsion in reinforced concrete that members should: 1) satisfy the equilibrium condition (Mohr’s stress circle); 2) obey the compatibility condition (Mohr’s strain circle); and 3) establish the constitutive relationships of materials such as the “softened” stress-strain relationship of concrete and “smeared” stress-strain relationship of steel bars. The behavior of members subjected to torsion combined with bending moment, axial load, and shear is discussed. This report deals with design issues, including compatibility torsion, spandrel beams, torsional limit design, open sections, and size effects.
OVERVIEW
1—INTRODUCTION AND SCOPE
2—NOTATION AND DEFINITIONS
3—HISTORICAL OVERVIEW OF TORSION THEORIES AND THEORETICAL MODELS
4—BEHAVIOR OF MEMBERS SUBJECTED TO PURE TORSION
5—ANALYTICAL MODELS FOR PURE TORSION
6—MEMBERS SUBJECTED TO TORSION COMBINED WITH OTHER ACTIONS
7—ADDITIONAL DESIGN ISSUES RELATED TO TORSION
8—DETAILING FOR TORSIONAL MEMBERS
9—DESIGN EXAMPLES
10—REFERENCES
DETAILS
Author: Joint ACI-ASCE Committee 445
Publication Year: 2013
Pages: 92
ISBN: 9780870318108
Categories: Torsion
Formats: Printed Document, PDF
LINKS
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Building Code Requirements for Structural Concrete, 2014
Metric Building Code Requirements for Structural Concrete, 2011
Metric Building Code Requirements for Structural Concrete, 2014
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Building Code Requirements for Structural Concrete, Spanish, Inch-Pound, CD 2011
Residential Code Requirements for Structural Concrete, 2014
Metric Residential Code Requirements for Structural Concrete, 2010
Design and Construction of Structural Concrete Reinforced, 2015
Shear Design of Structural Concrete, R2009
Structural Concrete Behavior, Implementation
Structural Concrete in Performance-Based Seismic Design of Bridges CD