Abstract
Results of fatigue tests on bolted connections in high strength structural steel conducted at the University of Illinois are presented. The principal parameter varied was the bolt type; one additional variation was included also. Constant amplitude fatigue tests were conducted at various stress ratios, with particular emphasis on zero-to-tension testing. The results indicate improved fatigue strength for high strength structural steel (yield strength = 50.0 ksi) compared to A36 steel. Connections with A325 bolts exhibit approximately the same fatigue strength as those in which A490 bolts are used. A comparison of results of present study with those from other sources indicates that stress based on gross section area gives a better correlation with the number of load cycles to failure of steel in bolted connections than net section stress.
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