PC鋼素線の引張疲労強度

概要

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In the previous report, the fatigue behavior of 1×7 PC-strand was investigated. In this paper a report is made of the fatigue tests that were on the wire which the said strands composed . The fatigue failure of the test specimen at chucked-off end impends the experiment to find the fatigue strength of the specimen. To meet this difficulty the following method was employed. Several long specimen pieces were used, and at every failure at the chuck rechucking was performed on the shortened specimen. The fatigue test was continued by subjecting the specimens to repetition of failure and rechucking, and replacing one specimen with another when shortest limit was reached. The following conclusions have been obtained : (1) The notch factor β for the strength at chuck is estimated at between about 1.5 and 2.0. (2) The notch factor β for the strength of the strand compared to the wire is estimated at 2.0〜3.0. These values of β are calculated between allowable stress amplitudes at the same mean stress.
1969-07-15