Cyclic Loading Test for Reinforced-Concrete-Emulated Beam-Column Connection of Precast Concrete Moment Frame

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Title: Cyclic Loading Test for Reinforced-Concrete-Emulated Beam-Column Connection of Precast Concrete Moment Frame

Author(s): Hyeong-Ju Im, Hong-Gun Park, and Tae-Sung Eom

Publication: Structural Journal

Volume: 110

Issue: 1

Appears on pages(s): 115-126

Keywords: connections; ductility; energy dissipation; precast concrete; seismic tests; stiffness

Date: 1/1/2013

Abstract:
An experimental study was performed to investigate the earthquake resistance of beam-column connections developed for a precast concrete (PC) moment frame. In the moment frame, PC is used for the columns and U-shaped beam shells, and cast-in-place concrete is used for the beam-column joint and the beam core. Six full-scale cruciform beam-column connections, including a conventional reinforced concrete (RC) connection, were tested under cyclic loading. The test parameters were the reinforcement ratio of the beams and the interface details between the PC column and the PC beam shell. The test results showed that regardless of the test parameters, the RC-emulated beam-column connections exhibited good deformation capacities, which were comparable to that of the conventional RC connection. Because of the diagonal shear cracking and reinforcing bar bond slip at the beam-column joint, however, the stiffness and hysteretic energy dissipation significantly decreased. To prevent the degradation of the stiffness and energy dissipation, a strengthening method using headed reinforcing bars was proposed and tested. The performances of the test specimens were evaluated according to the requirements of ACI 374.1-05. On the basis of the test results, design considerations for the beam-column connection were recommended.