SURFACE TREATMENT OF HIGH-STRENGTH BOLTED JOINTS

THE EFFECT OF GALVANIZING ON THE ASTM A 325 AND A 490 HIGH -STRENGTH BOLTS AND THE PERFORMANCE OF BOLTED JOINTS UNDER STATIC LOADS IN WHICH THE FAYING SURFACES WERE GALVANIZED, COLD ZINC PAINTED, METALLIZED, TREATED WITH VINYL WASH OR WITH ANOTHER RUST-PREVENTING PAINT, WERE STUDIED. COMPARISONS WERE MADE WITH NONGALVANIZED BOLTS AND WITH JOINTS WITH UNTREATED MILL-SCALE SURFACES. THE TORQUE NECESSARY TO TIGHTEN THE HIGH-STRENGTH BOLTS IS INCREASED BY GALVANIZATION, BUT THIS EFFECT MAY BE ALMOST ELIMINATED BY THE USE OF POWER TORQUING, OR BY LUBRICATION. THE HOT DIP GALVANIZING GAVE AN AVERAGE COEFFICIENT OF FRICTION OF 0.23. THE OTHER SURFACE TREATMENTS GAVE VALUES BETWEEN THAT OF DRY MILL-SCALE AND THAT OF SANDBLASTED METAL SURFACES. /ASCE/

• Supplemental Notes:
  • Vol 94, No ST 3, PROC PAPER 5851, PP 671-681, 6 FIG, 4 TAB,
• Authors:
  • Brookhart, G C
  • Siddiqi, I H
  • Vasarhelyi, D D
• Publication Date: 1968-3

Media Info

• Serial:
  • Journal of the Structural Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Bolted joints; Bolts; Friction; Galvanizing; Joints; Static loads; Structural engineering; Surface treating
• Old TRIS Terms: High strength bolts; Hot dip galvanizing; Joint
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208441
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 15 1994 12:00AM