مهندسی عمران شریف (Feb 2021)
EXPERIMENTAL STUDY OF MECHANICAL SPLICES OF TENSILE REINFORCED CONCRETE BEAMS UNDER BENDING
Abstract
In order to investigate into the performance of mechanical splices, 6 RC beams with the same dimensions and materials whose only difference is type and location of splicing, have been tested. This study aims to assess the effect of spacing between the splices with respect to their type. Indeed, the results of this paper are intended to provide a proper understanding from location of splices and its effect on the performance of the reinforced concrete (RC) beams. The results indicated that splices do not cause remarkable change in load-carrying capacity of the specimens. In addition, after applying loads and fracture of specimens, none of the mechanically-spliced rebars was ruptured at the location of splice and coupler remained undamaged. Further, it was observed that the reference beam and mechanically spliced beam (tension rebar in the mid-span and 2 other tension rebars with spacing of 60cm from mid-span and symmetrically distributed along the beam) exhibited minimum effective moment of inertia and thus, the same trend regarding flexural rigidity that is in direct relation to the moment of inertia, was attained. Accordingly, the reference beam and specimen L100 offered minimum displacement ductility. Specimen L33 and M33-60 exhibited 6\% increase and 10\% decrease in their strength respectively, experiencing maximum and minimum load-carrying capacity.
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