Axial Tension Fatigue Strength of Anchor Bolts.

摘要

This report presents the results of an experimental investigation to determine the influence of several specification and design parameters on the fatigue behavior of commonly used anchor bolts. The parameters studied include:type of steel,thread series,nominal diameter,thread forming method,and stress range on the tensile stress area. Analysis of the test results showed that the fatigue life of anchor bolts is comparable to a Category E detail in the present AASHTO fatigue specifications. The pitch of the thread and the diameter of the anchor bolt did not influence the fatigue behavior of the bolts studied. The tensile strength of the steel did influence the fatigue life of the anchor bolts. The A36steel bolts gave significantly longer fatigue lives. The test series of anchor bolts with rolled threads yielded fatigue lives comparable to bolts with cut threads except at the lower stress ranges. No cracking of the rolled threaded bars was found for stress ranges of 10and 15ksi. Longitudinal beam ultrasonic inspection of anchor bolts was found to be capable of detecting early stages of fatigue cracking. A method of estimating the remaining fatigue life of a bolt with a fatigue crack was developed.