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Steel and Composite Structures
  Volume 21, Number 2, June10 2016 , pages 443-460

An innovative experimental method to upgrade performance of external weak RC joints using fused steel prop plus sheets
Ali Kheyroddin, Ali Khalili, Ebrahim Emami and Mohammad K. Sharbatdar

    In this paper, the efficiency and effectiveness of two strengthening methods for upgrading behavior of the two external weak reinforced concrete (RC) beam-column joints were experimentally investigated under cyclic loading. Since two deficient external RC joints with reduced beam height and low strength concrete were strengthened using one-way steel prop and curbs with and without steel revival sheets on the beam. The cyclic performance of these strengthened specimens were compared with two another control external RC beam-column joints, one the standard RC joint that had not two mentioned deficiencies and another had both. Therefore, four halfscale RC joints were tested under cyclic loading.The experimental results showed that these innovative strengthening methods (RC joint with revival sheet specially) surmounted the deficiencies of weak RC joints and upgraded their performance and bearing capacity, stiffness degradation, energy absorption, up to those of standard RC joint. Also, results exhibited that the prop at joint acted as a fuse element due to adding steel revival sheets on the RC beam and showed better behavior than that of the specimen without steel revival sheets. In other words by stiffening of beam, the prop collected all damages due to cyclic loading at itself and acted as the first line of defense and prevented from sever damages at RC joint.
Key Words
    RC beam-column joints; strengthening; steel prop and curb; revival sheets; cyclic loading
(1) Ali Kheyroddin, Ali Khalili, Mohammad K. Sharbatdar:
Civil Engineering Faculty, Semnan University, Semnan,Daneshgah Sq, I.R of Iran;
(2) Ebrahim Emami:
Department of Civil Engineering, Payame Noor University,Tehran, I.R of Iran.

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