Proposal of Applications of Brace-type Damper in Hinge Relocation RC Beam
By Y. Maida, S. Kishiki, Z. Qu and H. Sakata
Concrete Journal, Vol.58, No.8, Aug. 2020
- Synopsis
- In this paper, it is proposed to use an unconstrained gusset plate and a hinge relocation technique to control the damage to RC beam-column joints. The structural behavior of RC beams with BRB connections and relocated plastic hinges is investigated by cyclic loading tests. In the tests on RC beams with BRB connections, the BRB axial force was simulated by a force controlled actuator to simplify the boundary condition of the test setup. Two diff erent details of BRB gusset connections were examined. In one method, the gusset plate was fastened to the end of the RC beam by posttensioned steel rods, whereas it was embedded in the RC beam and anchored there by a stud group in the other method. The test results confi rmed that the proposed hinge relocation scheme is eff ective in controlling the locations of plastic hinges in RC beams so as to prevent the BRBs from being dislocated from the entire structural system as a result of the beam end failure at extreme earthquake scenarios. Both gusset connection details performed satisfactorily by providing suffi cient strength and large stiff ness to minimize the deformation loss in the BRB connections.
- Keywords:
- RC beam, Hinge relocation, Brace-type damper, PC rod, Stud
