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Research Reports

Design of Prestressed Concrete Girders Without End Blocks

Description:

This report investigates the feasibility of removing end blocks from the Washington State series 10 and 14 simply supported prestressed girders. These girders are characterized by their 5" webs and are pretensioned using both harped and straight 1/2" grade 27 strands.

A series 14 girder, 48 ft. long, is manufactured without end blocks and destructively tested. Based on the results of this test, a 100 ft. series 10 girder was manufactured without end blocks and monitored in a bridge under actual service conditions.

Results from these tests show that the modified ends performed effectively under both prestress transfer and service loads. Accordingly, a recommendation is made to remove end blocks from such girders.

  • Date Published: February, 1986
  • Publication Number: WA-RD 81.1
  • Last Modified: June 23, 2007
  • Authors: Rafik Y. Itani, Ronald L. Galbraith.
  • Originator: Washington State University. Dept. of Civil and Environmental Engineering.
  • # of Pages: 139 p., 12,666 KB (PDF)
  • Subject: Bearing capacity, Blocks, Breaking loads, Girders, Prestressed concrete, Prestressing, Pretensioning.
  • Keywords: Concrete, girders, beams, prestressed, pretensioned, end blocks, stresses.
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This abstract was last modified April 29, 2008