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A platform for research: civil engineering, architecture and urbanism
Shear and Torsion
Abstract The behavior of beams and slabs in flexure is well understood and is generally predicted with satisfactory margin of error as reflected by the strength reduction factor. Flexure is considered on a section basis. The application of principles learned in mechanics of materials with some modification for nonlinear material behavior is more than suitable to obtain a reasonable solution. The modeling of shear behavior in reinforced and prestressed concrete, however, does not lend itself to consideration at the sectional level. Before cracking, as we shall explore in this chapter, the element is analyzed using first principles. After cracking, though, flexure is still analyzed on a sectional basis, but not shear. In fact, shear behavior of cracked concrete beams has historically been idealized as a truss by visualizing a series of concrete diagonals and steel vertical members that transfer stresses through the element. The concrete diagonal members have traditionally been assumed to be at an angle of 45° from the beam axis. The contribution of the concrete tensile strength was customarily ignored, so the method underestimated the shear capacity. Current design practice in both the ACI Building Code and AASHTO LRFD Design Specification utilizes a plastic truss analogy for both reinforced and prestressed concrete.
Shear and Torsion
Abstract The behavior of beams and slabs in flexure is well understood and is generally predicted with satisfactory margin of error as reflected by the strength reduction factor. Flexure is considered on a section basis. The application of principles learned in mechanics of materials with some modification for nonlinear material behavior is more than suitable to obtain a reasonable solution. The modeling of shear behavior in reinforced and prestressed concrete, however, does not lend itself to consideration at the sectional level. Before cracking, as we shall explore in this chapter, the element is analyzed using first principles. After cracking, though, flexure is still analyzed on a sectional basis, but not shear. In fact, shear behavior of cracked concrete beams has historically been idealized as a truss by visualizing a series of concrete diagonals and steel vertical members that transfer stresses through the element. The concrete diagonal members have traditionally been assumed to be at an angle of 45° from the beam axis. The contribution of the concrete tensile strength was customarily ignored, so the method underestimated the shear capacity. Current design practice in both the ACI Building Code and AASHTO LRFD Design Specification utilizes a plastic truss analogy for both reinforced and prestressed concrete.
Shear and Torsion
Dolan, Charles W. (author) / Hamilton, H. R. (Trey) (author)
Prestressed Concrete ; 169-218
2018-11-15
50 pages
Article/Chapter (Book)
Electronic Resource
English
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