TRANSFER OF LOAD BETWEEN PRECAST BRIDGE SLABS

PROCEDURES FOLLOWED AND RESULTS OBTAINED ARE GIVEN OF A SERIES OF STATIC LOAD TESTS TO STUDY THE MECHANISM OF LOAD TRANSFER BETWEEN ADJACENT PRECAST BRIDGE-SLAB SECTIONS. THESE TESTS WERE UNDERTAKEN AS ONE PHASE OF A GENERAL STRUCTURAL AND ECONOMIC STUDY OF PRECAST BRIDGE UNITS UNDER THE SPONSORSHIP OF THE MISSOURI STATE HIGHWAY COMMISSION AND THE BUREAU OF PUBLIC ROADS. THE APPLICABLE LOAD REDUCTION COEFFICIENTS FOR THE TEST SERIES WERE: SLOPE OF STRAIN CURVE 0.41, EQUIVALENT-YIELD DEFLECTION 0.42, INITIAL-YIELD STRAIN 0.50, SECONDARY-YIELD STRAIN 0.42, WORKING-LOAD STRAIN 0.38, ULTIMATE LOAD 0.54, AND END REACTIONS 0.37. THE LOAD REDUCTION COEFFICIENTS BASED ON YIELD STRAINS AND DEFLECTIONS AFTER LOAD DISTRIBUTION ARE SLIGHTLY MORE CONSERVATIVE THAN THE COEFFICIENTS BASED ON WORKING-LOAD STRAINS. THE FAILURE MODES AT ULTIMATE LOAD WERE INCOMPATIBLE AND THEREFORE ULTIMATE LOAD CAPACITY SHOULD NOT BE USED AS A METHOD OF COMPARISON. BECAUSE OF THE RESERVE CAPACITY DEVELOPED BY LOAD REDISTRIBUTION, THE SECONDARY YIELDING OF THE PRINCIPAL REINFORCEMENT APPEARS TO OFFER THE MOST RATIONAL BASIS FOR THE DETERMINATION OF A SUITABLE LOAD REDUCTION COEFFICIENT.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/279/279-001.pdf
• Supplemental Notes:
  • No 279, pp 1-17, 25 FIG, 2 TAB Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Pauw, Adrian
  • Breen, John E
• Conference:
  • 39th Annual Meeting of the Highway Research Board
  • Location: Washington DC, United States
  • Date: 1960-1-11 to 1960-1-15
• Publication Date: 1961

Media Info

• Media Type: Digital/other
• Pagination: 17p
• Monograph Title: Bridge design studies and piling tests, 1960
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 279
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Concrete bridges; Deflection; Load tests; Load transfer; Precast concrete; Slabs; Static loads; Strain (Mechanics); Structural design
• Old TRIS Terms: Concrete bridge structures; Static loading; Strains
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208807
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 12 1994 12:00AM