Splices in Tensile Reinforcing Bars. Part I: Static Tests of Splices. Part II: Flexural Beam Tests

摘要

The report provides information on the relative merits of various methods of connecting tensile reinforcing bars in reinforced concrete construction. A series of 122 different bar samples were prepared and tested to failure. A total of eight different splicing systems were studied plus a series of control bars (continuous bars without any splices). Stress-strain diagrams are included for all samples that yielded sufficient data. On the basis of this study, the most promising types of splicing devices were selected for flexural tests. Results of the research indicated that there was no equivalent substitute for a continuous bar in a member without sacrificing some ultimate capacity and stiffness. At points where a splice must be used, greater deflection and reduced ultimate capacity should be recognized by the designer. The lap distance required by the 1961 AASHO specifications should be increased to 25 bar diameters. If a lap splice is not feasible, a splice consisting of a sleeve with metal filler was the next most suitable method for splicing tensile reinforcing bars. The addition of stirrups in the lap zone, at a spacing of not more than one-half the depth of the member adds approximately 60% to the strength of a lap joint without increasing the lap distance required. (Author)