Abstract:
In order to reduce the unloading resistance, a self-centering (SC) concrete-filled square steel tubular column and steel beam joint with slotted energy dissipation plates was designed. Low cyclic reversed loading tests of five full-scale joints were conducted to study the aseismic behavior. The mechanical properties were analyzed and the restoring force model was established. The results show that the self-centering joint with slotted energy dissipation plates has good bearing capacity, self-centering capacity and energy dissipation with the "double flag" shape hysteresis curve. The residual deformation is small under 4.00% drift, and the components remain elastic except energy dissipation plates which can be quickly repaired by replacing the plates. The wider the individual slat, the weaker the self-centering ability and the stronger the energy dissipation capability. The larger the width and thickness of the plates, the stronger the bearing and energy dissipation capacity, but the self-centering ability becomes weaker. The prestress of strands has significant influence on the initial stiffness, bearing capacity and self-centering ability, but has little influence on energy dissipation. The restoring force model agrees well with the experimental results.