Title: Fatigue Tests of Spliced Reinforcement in Concrete Beams
Author(s): E. W. Bennett
Publication: Symposium Paper
Appears on pages(s): 177-194
Keywords: beams (supports); cracking (fracturing); fatigue tests;
-(forces); reinforced concrete; reinforcing stemsplicing.
An account is given of eight fatigue tests on rein-orce concrete beams incorporating two types of mechanical splice, namely a single cold-forged sleeve and a screwed coupler connecting two cold-forged sleeves. The tests enabled the limiting range of bar stress to be found approximately, and the deflection and width of cracks were satisfactory under this range provided that the screwed coupler was fitted with a lock nut. In a comparative test, a beam with conventional splices consisting of straight lapped bars withstood the same fatigue stress as the cold-forged splices, but with increased deflection and maximum crack width. A second beam in which the lapped bars were cranked failed at a lower stress by fatigue fracture at one of the bends.