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STATIC AND FATIGUE STRENGTH OF TIMBER JOINTS

This investigation was performed to determine the relative static and fatigue strength of bolted timber joints and bolted timber-grid joints used to fasten the sway bracing to the piles or caps in timber pile trestle construction. Full-sized untreated timbers were used. Holes were bored through the sway bracing and piles using the same diameters as the four sizes of fasteners to help eliminate the slip between the sway bracing and the pile. Additional testing was done with single-curve spike grids between the sway brace and the pile. Testing equipment was described. The average data obtained from three tests in the fatigue machine was taken as the static strength of the joint. Repeated-load tests were made on similar specimens. In order to compare the various types of joints under repeated loading, a total movement of 0.25 in between the sway bracing and the pile was arbitrarily selected as the failure point for all the joints. If the joints had not reached the failure point after 500,000 cycles of applied load the test was discontinued .It was indicated that an increase in the fatigue strength of the joints was related to an increase in the size of the fastener and the thickness of the sway brace. Moisture content before and after testing was determined with a moisture meter.

  • Corporate Authors:

    American Railway Engineering Association

    59 East Van Buren Street
    Chicago, IL  United States  60605
  • Publication Date: 1954

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 213-221
  • Serial:
    • AREA BULLETIN
    • Volume: 55
    • Publisher: American Railway Engineering Association

Subject/Index Terms

Filing Info

  • Accession Number: 00052413
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Jul 15 1974 12:00AM