Prestressed Concrete Designer's Handbook
Prestressed Concrete Designer's Handbook

Author: P.W. Abeles

Publisher: CRC Press

Published: 1981-01-01

Total Pages: 600

ISBN-13: 9780721012278

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The third edition of this authoritative handbook provides the structural designer with comprehensive guidance on prestressed concrete and its effective use, covering materials, behaviour, analysis and design of prestressed elements. It includes numerous examples, design charts and details of post-tensioning systems.

Damping Characteristics of Prestressed Concrete
Damping Characteristics of Prestressed Concrete

Author: Joseph Penzien

Publisher:

Published: 1962

Total Pages: 144

ISBN-13:

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Under steady state conditions, internal damping in prestressed concrete members may be less than 1% of critical if the initial prestress is sufficient to prevent tension cracks from developing. If tension cracks are allowed to develop, but on a miscroscopic scale, damping can be expected of the order of 2% of critical. If larger (visible) cracks are permitted to develop, higher damping would result. Under transient conditions, the amount of internal damping present in prestressed concrete members depends to a great extent on the past history of loading and on the amplitude of displacements produced. For those cases where members have been dynamically loaded only a few times to a given stress level which produces considerable cracking, damping can be expected anywhere in the range of 3 to 6% of critical. Magnitude and type of prestress in concrete members have an indirect influence on internal damping only because these parameters control the amount of cracking which can take place. (Author).

Construction Vibration Attenuation with Distance and Its Effect on the Quality of Early-age Concrete
Construction Vibration Attenuation with Distance and Its Effect on the Quality of Early-age Concrete

Author: John Siwula

Publisher:

Published: 2011

Total Pages: 470

ISBN-13:

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Damage to structures due to vibrations from pile driving operations is of great concern to engineers. This research has stemmed from the need to address potential damage to concrete-filled pipe piles and recently placed concrete structures that could be affected by pile driving vibrations. The study will focus on two topics: (1) The attenuation of potentially damaging pile driving vibrations with distance from the source, and (2) The effects of distance and curing time of concrete on the quality (unconfined compressive strength) of recentlyplaced concrete exposed to pile driving vibrations. The effects of pile driving vibrations did not cause problems with concrete compressive strength except for the case where concrete had only cured for 4 to 6 hours before vibration.