Research Article
Oct 1965
Calibration Tests of A490 High-Strength Bolts
Authors: Gordon H. Sterling, Emile W.J. Troup, AM.ASCE, Eugene Chesson Jr., M.ASCE, and John W. Fisher, M.ASCEAuthor Affiliations
Publication: Journal of the Structural Division
Volume 91, Issue 5
Abstract
Tests were conducted on two lots of A490 bolts at Lehigh University and the University of Illinois to determine if testing procedures constitute a variable. Over 100 calibration tests were conducted of 7/8-in. by 5 l/2-in. and 7/8-in. by 9 1/2-in. ASTM A490 high-strength bolts. These included 40 direct tension tests and 60 torqued-tension tests. The torqued-tension tests were conducted in hydraulic calibrating devices and in solid steel blocks. Data on bolt tension, elongation, turns-of-nut, and general behavior were analyzed. The tests showed no significant difference between the results obtained at the two universities. The tests showed that the direct tensile strength was 10% to 20% greater than the torqued tension strength. Only the shorter bolts (7/8-in. by 5 l/2-in.) reached proof load after one-half turn from snug. Comparisons of bolt behavior when torqued in the hydraulic bolt calibrator and in the solid steel block showed that less load was induced into the bolt at one-half turn in the hydraulic calibrator. This study shows that additional rotation beyond one-half turn is necessary for the longer A490 bolt if the proof load is to be reached.
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Information
Published In
Journal of the Structural Division
Volume 91 • Issue 5 • October 1965
Pages: 279 - 298
Copyright
© 1965 American Society of Civil Engineers.
History
Published in print: Oct 1965
Published online: Feb 1, 2021
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Authors
Affiliations
Gordon H. Sterling
Research Asst., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.
Emile W.J. Troup, AM.ASCE
Lt., Corps of Engrs., Newton Lower Falls, Mass.; formerly, Research Asst., Univ. of Illinois, Urbana, Ill.
Eugene Chesson Jr., M.ASCE
Assoc. Prof., of Civ. Engrg., Univ. of Illinois, Urbana, Ill.
John W. Fisher, M.ASCE
Research Asst. Prof., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.