TESTS OF BOLTED BUTT SPLICES

RESULTS ARE PRESENTED OF EXPERIMENTAL STUDIES OF CONSTRUCTIONAL ALLOY (A514) STEEL BUTT SPLICE FASTENED BY A490 BOLTS. ALSO INCLUDED ARE RESULTS OF EXPERIMENTAL WORK ON HYBRID JOINTS. STATIC TENSION TESTS WERE CONDUCTED ON 15- DOUBLE-SHEAR BUTT JOINTS WITH 4 TO 19 HIGH-STRENGTH BOLTS IN A LINE. EACH BOLT WAS SUBJECTED TO STANDARD CALIBRATION TESTS INCLUDING DIRECT AND TORQUED TENSION CALIBRATIONS AND THE DETERMINATION OF THE SHEAR-DEFORMATION CHARACTERISTICS OF THE BOLTS. THE INSTRUMENTATION OF THE SPECIMENS INCLUDED SR-4 STRAIN GAGES AND DIAL GAGES. THE ELECTRIC RESISTANCE STRAIN GAGES WERE ATTACHED TO THE EDGES OF THE PLATE AT VARIOUS LOCATIONS ALONG THE LENGTH OF THE JOINT. THEY PROVIDED A MEANS OF EVALUATING THE LOAD TRANSFER MECHANISM AND ENABLED A COMPARISON TO BE MADE OF THEORETICAL AND EXPERIMENTAL PLATE LOADS THROUGHOUT THE JOINT. THE JOINTS WERE LOADED IN STATIC TENSION BY MEANS OF A 5,000 KIP UNIVERSAL TESTING MACHINE USING WEDGE GRIPS. THE SLIP COEFFICIENT OF STEEL BLAST CLEANED WITH NO. 50 CHILLED STEEL GRIT WAS DETERMINED TO BE ABOUT 0.34. THEORETICAL SOLUTIONS FOR PREDICTING THE ULTIMATE LOAD OF A514 STEEL JOINTS AND HYBRID STEEL JOINTS WERE CONFIRMED. CONSTRUCTIONAL ALLOY STEEL JOINTS FASTENED BY A325 BOLTS CANNOT PRODUCE YIELDING ON THE CROSS SECTION IF THE ELEMENTS OF THE JOINT ARE DESIGNED ACCORDING TO CURRENT PRACTICE. THE A325 BOLT IS NOT AS SUITABLE A CONNECTOR FOR A514 STEEL AS IS THE A490 BOLT. THE HYBRID JOINT TESTS CONFIRMED THE PREDICTION THAT HYBRID JOINTS BEHAVED SIMILARLY TO HOMOGENEOUS JOINTS AND THAT THEIR STRENGTH IS EQUAL TO OR GREATER THAN THAT OBTAINED FOR SIMILAR HOMOGENEOUS JOINTS. THE USE OF HIGHER ALLOWABLE SHEAR STRESSES FOR A325 AND A490 BOLTS IN VARYING-TYPE CONNECTIONS AS SUGGESTED WAS SUITABLE FOR BOTH HYBRID AND A514 STEEL JOINTS.

• Supplemental Notes:
  • Fritz Lab REPORT NO 317.11, PP 1-23, 6 FIG, 4 TAB, 6 REF
• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015
• Authors:
  • Fisher, J W
  • Kulak, G L
• Publication Date: 1967-12

Subject/Index Terms

• TRT Terms: Alloy steel; Bolted joints; Bolts; Breaking loads; Butt joints; Calibration; Joints; Load transfer; Plate bearing test; Shear stress; Splicing; Static tests; Strain gages; Tension tests
• Uncontrolled Terms: Hybrids
• Old TRIS Terms: Electrical strain gages; University testing machine
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208428
• Record Type: Publication
• Files: TRIS
• Created Date: May 6 1994 12:00AM