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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: Sudden Collapse of Unbonded Underprestressed Structures
Author(s): G. I. N. Rozvany and J. F. Woods
Publication: Journal Proceedings
Appears on pages(s): 129-135
Keywords: beams (supports); concrete slabs;cracking (fracturing) ; dynamic loads; flat plates (concrete) ;flexural strength; live loads; prestressed concrete; research; stability; unbonded prestressing.
Abstract:Discusses the behavior of unbonded prestressed beams and slabs at flexural cracking, which is often accompanied by a sudden decrease of the load capacity. This instability phenomenon is of considerable importance because it can cause a sudden collapse of unbonded prestressed structures when they are subjected to excessive live loads or earthquake loads. A theoretical explanation of the foregoing problem is given, and it is concluded that sudden collapse can be avoided by making the average concrete prestress greater than the modulus of rupture. Experimental verifications of the foregoing proposition are presented. Two worked examples are included to illustrate the proposed method.
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