STUDY OF COMPOSITE BRIDGE STRINGERS - PUSHOUT TESTS WITH HIGH-STRENGTH PRETENSIONED BOLTS

TWELVE STATIC PUSHOUT TESTS USING HIGH STRENGTH PRETENSIONED BOLTS AS SHEAR CONNECTORS WERE PERFORMED. BOLTS WITH DIAMETERS OF 1/2, 5/8, AND 3/4 INCHES WERE TENSIONED BY THE TURN-OF-NUT METHOD AND EMBEDDED IN NORMAL-WEIGHT CONCRETE SLABS. THE LOAD-SLIP CHARACTERISTICS OF BOLTS WERE COMPARED WITH THOSE OF STUDS. COMPANION SPECIMENS WERE TESTED TO DETERMINE THE AMOUNT OF TENSION INDUCED IN A BOLT BY THE TURN-OF-NUT METHOD AND TO DETERMINE THE IMPORTANCE OF EDGE CLEARANCE IN HAUNCHED MEMBERS. MAJOR CONCLUSIONS WERE' /1/ HIGH STRENGTH PRETENSIONED BOLTS EXHIBIT PRACTICALLY ZERO SLIP IN THE WORKING RANGE OF THE LOAD. /2/ BOLTS ATTAIN A CRITICAL LOAD OR USEFUL CAPACITY THAT IS TWICE THAT OF STUDS. /3/ THERE IS APPARENTLY NO LOSS IN PRESTRESS WITH TIME IN HIGH QUALITY CONCRETE. /BPR/

• Record URL:
  • https://spexternal.modot.mo.gov/sites/cm/CORDT/Dallam1966.pdf
• 
• Supplemental Notes:
  • Hpr-1/5/, 63-7
• Corporate Authors:

  Missouri State Highway Commission

  State Highway Building
  Jefferson City, MO  United States  65101

  University of Missouri, Columbia

  1205 University Avenue
  Columbia, MO  United States  65201
• Authors:
  • Dallam, L N
• Publication Date: 1966-8

Subject/Index Terms

• TRT Terms: Alternatives analysis; Bolts; Bridges; Composite structures; Concrete; Fasteners; Laboratory tests; Pretensioning; Shear reinforcement; Slabs; Static tests; Stringers; Studs
• Uncontrolled Terms: Composite bridges; Pushout tests; Shear connectors; Slippage
• Old TRIS Terms: High strength bolts
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207812
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: Dec 12 1994 12:00AM