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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: Role of Shear Reinforcement in Large-Deflection Behavior
Author(s): Sam A. Kiger, Stanley C. Woodson, and Frank D. Dallriva
Publication: Structural Journal
Appears on pages(s): 664-671
Keywords: blast-resistant structures; concrete slabs; deflection; ductility; reinforced concrete; reinforcing steels; shear strength; stirrups; supports; ties (reinforcement); Structural Research
Abstract:Shear reinforcement in the form of lacing or stirrups is required by applicable design manuals for almost all blast-resistant structures. In blast-resistant designs, the primary purpose of this type of reinforcement is not to resist shear forces but rather to improve performance in the large deflection region by tying the two principal reinforcement mats together. The data reviewed in this paper indicate that the requirements of the design manuals for shear reinforcement may be much more restrictive (and expensive) than necessary. Several examples of dynamic and static tests on structures using stirrups demonstrated that support rotations exceeding 20 deg without failure are possible. In one case, for both static and dynamic tests, rotations of over 14 deg were incurred with no shear reinforcement at all. In particular, a widely used manual requiring the use of laced reinforcement for all designs with rotations in excess of 8 deg seems overly restrictive. Additional research should be conducted to quantify the relative advantages of using stirrups versus lacing or possibly no shear reinforcement.
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