Deflection of Partially Prestressed Beams Under a Combination of Long-Time and Short-Time Loading

ABOUT THE 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.

International Concrete Abstracts Portal

  


Title: Deflection of Partially Prestressed Beams Under a Combination of Long-Time and Short-Time Loading

Author(s): E. W. Bennett and K. H. Lee

Publication: Special Publication

Volume: 86

Issue:

Appears on pages(s): 185-214

Keywords: beams (supports); cracking (fraturing); cyclic loads; deflection; loads (forces); partial prestressing; prestressed concrete.

Date: 8/1/1985

Abstract:
A series of nine partially prestressed concrete beams was tested by a combination of a long-time load with intermittent cycles of short-time load over a total period of about one month. Additional tests were made of three of the beam types under the long-time load alone. The load-deflection-time relationships are discussed and a method of calculation of deflection is described which takes account of the "tension stiffening" effect of the concrete between the cracks. The ACI 318-83 recommendations are also checked against the results and found to be satisfactory for initial short-time loading but unconservative for a combination of long-time and intermittent cyclic loading.