Accession Number:

AD0271886

Title:

DAMPING CHARACTERISTICS OF PRESTRESSED CONCRETE

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s):

Report Date:

1962-01-01

Pagination or Media Count:

1.0

Abstract:

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE