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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: Dynamic Response of Unbonded Prestressing Tendons Cut During Demolition
Author(s): Martin S. Williams and Peter Waldron
Publication: Structural Journal
Appears on pages(s): 686-696
Keywords: cutting; damping; demolition; dynamic characteristics; post-tensioning; prestressed concrete; prestressing steels; stress waves; unbonded prestressing; Structural Research
Abstract:Numerous concrete structures employ modern construction techniques that may result in demolition problems. A number of such concerns have been highlighted in the field of prestressed concrete, including the cutting of elements post-tensioned by unbonded tendons. Since the tendons are not restrained along their length by bond with the concrete, the sudden energy release due to cutting may cause dangerous movement of the tendon and its end anchorage. A laboratory-based research project has examined movement of tendons cut in this way. Results are presented from a series of tests on unbonded tendons, together with a number of subsidiary tests in whichindividual parameters were studied in detail. The nature of tendon movement is discussed and the various restraints to motion are assessed. Displacements of released tendons are shown to be small, due mainly to the damping effect of the grease layer around the tendon.
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