Fatigue Tests of Reinforcing Bars-Tack Welding of Stirrups

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Title: Fatigue Tests of Reinforcing Bars-Tack Welding of Stirrups

Author(s): Kenneth T. Burton and Eivind Hognestad

Publication: Journal Proceedings

Volume: 64

Issue: 5

Appears on pages(s): 244-252

Keywords: beams (structural);fatigue (materials);high strength steels;reinforced concrete; reinforcement;reinforcing steel;research;stirrups;structural design;testing; welding

Date: 5/1/1967

Abstract:
This paper reports fatigue tests of concrete beams with tied stirrups and with stirrups tack welded to the main tension reinforcement. The beams were reinforced with #8 in-termediate grade and ASTM A 432 high strength bars of one deformation pattern. Test results of 68 beams indicate that careless tack welding of stirrups can reduce fatigue life of the longitudinal bars at a given stress range by 75 percent. Similarly, stress range at 5 million cycles can be reduced by 35 percent. Bar yield strength had only minor influence on fatigue strength for comparable stress ranges at 5 million repetitions.