Experimental investigation of a self-centering precast concrete beam-to-column connection with top and bottom friction energy dissipaters

摘要

The new friction material, non-asbestos organic, and Belleville springs are applied to the friction energy dissipaters (FEDs) to improve its friction performance. The new high-performance FEDs are placed in the top and bottom parts of the self-centering precast concrete (SCPC) beam-to-column connections, which have inherently reduced residual deformation caused by posttensioned tendons, to enhance energy dissipation efficiency. Besides, the reasonable design of the connection between FEDs and backbone members makes it easy for the disassembly of all members, which significantly enhances the repair efficiency after a major earthquake. Theoretical analyses and 14 tests were performed on a full-scale specimen, which were assembled two times, and the friction pads were replaced one time, to investigate the effects of various parameters on the performance of such FED-SCPC beam-to-column connections. The influence of key design parameters on the hysteretic behaviors, such as stiffness, loss of posttensioned tendons force, self-centering capacity, and energy dissipation capacity, has been analyzed. The test results indicate that the FED-SCPC beam-to-column connections can achieve significant and reliable energy dissipation levels while maintaining self-centering capabilities. The experimental and theoretical results can provide certain references for the seismic design and assembly of such structures.