The Rehabilitation of the Deficient RC Exterior Beam-Column Joints Using Cement Based Composites

Abstract eng:
The beam-column joints that are deficiently detailed and are not built in accordance with seismic codes present a serious hazard from view point of the overall ductility of a structure subjected to severe earthquake shocks. In order to prevent hazards associated with such deficiencies, many existing buildings have to be rehabilitated against severe earthquakes. Four half-scaled exterior beam-column joint specimens were prepared with only one of them conforming to the guidelines of ACI 318-02. The other three specimens were insufficient from view point of joint hoops and main reinforcements of beam and column. The two reinforced concrete (RC) exterior beam-column joints with these deficiencies were rehabilitated using cement based composites with alkali resistant (AR) Glass fabric and Saint Gobain Technical Fabric (SGTF) to improve an alternative and economical rehabilitation method. These rehabilitated RC joints were experimentally studied under the cyclic loads that simulate seismic excitation. In order to strengthen the deficient external beam-column joints, AR Glass and SGTF fabrics were laid out on the tension face of column and beam and then both column and beam were wrapped. Experimental results were compared against the sample designed in accordance to the ACI guidelines. The use of AR Glass and SGTF fabrics mounted by cement paste on the exterior surface of concrete was fairly effective on the ductility, absorbed total, dissipated and recovered energy in addition to ultimate displacement and load carrying capacity

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