Strengthening performance of column-beam joint made of recycled aggregate concrete using prestressed metal strapping

Abstract

The purpose of this study was to determine the efficacy of post-tensioned metal strapping (PTMS) on the seismic performance of beam-column joints of low compressive strength reinforced concrete with recycled aggregate concrete. The scope of this study was (1) to determine beam-to-column reinforcement (PTMS) with insufficient reinforcement profiles, and (2) to construct a nonlinear finite element model to determine efficiency of column reinforcement under cyclic loads in the early stages to start the first crack. Test specimens with insufficient reinforcement profile according to ACI 318-05 are subjected to seismic loads cyclic in the second example. The specimens were strengthened using a tensioned metal strapping (PTMS) at the beam and column connection zones.

       PTMS technology has been proven to be particularly effective in concrete reinforcement, it is affordable and practical. and easy to use. The maximum and minimum load applied to the unreinforced specimen are +2.16 and -1.91 tons respectively, and the maximum and minimum rebar loads are +3.10 and -2.72 tons, respectively, with a pitch of 3.70 mm and a 3.70 mm wide, about 1.0–2.0 mm in diameter, the type of crack is unusual. and the width of the crack is comparable.