CYCLIC TESTING OF NO. 6 REBAR DOWELS POST BONDED IN A REINFORCED CONCRETE BRIDGE DECK OVERHANG

The purpose of this research was to determne what maximum tensile strength of bonded rebar dowels used to anchor a replacement concrete bridge barrier sound wall system to bridge deck overhangs could be provided during the seismic loading of a several earthquake. In this report, the results of fatigue tests performed on thiry-one #6 rebar dowels bounded using either portland cement grout or magnesium phosphate concrete in a simulated bridge deck overhang are presented and discussed. Important parameters considered in this study included dowel embedment depth, type of bonding material, edge distance, magnitude of the peak cyclic load, dowel displacement, and the influence of a positive moment in the deck overhang on tensile strength of bonded dowels under cyclic loading. Sixteen exterior dowels, installed att a 5-inch embedment depth and an edge diistance of 3-1/2 to 4-1/2 inches, and fifteen interior dowels bonded in 6-inch-deep holes, and whose fatigue strengths were limited by a large bending moment in the deck overhang, were evaluated by cyclic loading. Following cyclic loading, the ultimate strength of each was determined by a short-term tensile test. It was found that after 15 cycles of fatigue loading with a maximum allowable dowel displacement of 0.02 inch, dowels bonded using magnesium phosphate concrete withstood at least twice the magnitude of peak cyclic load as those bonded with portland cement grout. Exterior and interior dowels bonded with magnesium phosphate concrete withstood peak cyclic loads of 15.8 kips and 26.4 kips respectively, while those bonded with portland cement grout withstood only 7.9 kips and 10.6 kips. (Author) grout withstood only 7.9 kips and 10.6 kips. (Author)

• Corporate Authors:

  California Department of Transportation

  Transportation Laboratory
  5900 Folsom Boulevard
  Sacramento, CA  United States  95819

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Dusel Jr, J P
  • Bon, V D
  • Stoughton, R L
  • Folsom, J J
• Publication Date: 1985-4

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 72 p.

Subject/Index Terms

• TRT Terms: Bonding; Bridge decks; Concrete; Dowels (Fasteners); Fatigue (Mechanics); Frequency (Electromagnetism); Grout; Luminosity factor; Phosphates; Portland cement; Reinforced concrete; Repeated loads; Seismicity
• Uncontrolled Terms: Overhang; Seismic response
• Old TRIS Terms: Luminosity
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Materials; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00450593
• Record Type: Publication
• Report/Paper Numbers: FHWA/CA/SD-85-04, 53314-624221
• Contract Numbers: F84SDI8
• Files: TRIS, USDOT, STATEDOT
• Created Date: Mar 31 1987 12:00AM