Hysteretic Performance of Floor-by-Floor Assembled Steel Frames with Cover-Plates Slip Friction Joint at Column Ends
The floor-by-floor assembled steel frame represents a novel structural form that fully em-bodies rapid assembly characteristics.Based on the low-damage seismic concept,experimental studies and numerical analyses have been conducted on the hysteresis performance of floor-by-floor assembled steel frames with Cover-Plates Slip Friction Joints(CPSFJ)at column ends.It is found that by instal-ling CPSFJ at the column ends,it is possible to effectively replace the energy dissipation through plas-tic damage of structural members with sliding friction under significant seismic activities,thereby pro-tecting the main structural components from damage.The experimental results indicate that under low-cycle reciprocal loading,the hysteresis curves exhibit a full bow shape and the skeleton curves display a three-stage flat-top form,demonstrating good energy dissipation capacity and stable hysteresis per-formance.To solve the issue of insufficient local stiffness of the beam ends,a reinforced rib arrange-ment improvement plan for the beam ends was proposed,which can significantly mitigate stress con-centration at the beam ends and reduce the likelihood of plastic damage.This study provides a new seismic energy dissipation scheme for the design of layered prefabricated steel frame structures,which has significant theoretical and practical value.
floor-by-floor assembledlow-damageslip friction jointcolumn end energy dissipationhysteretic performance
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