In this paper, a new arc-surfaced frictional damper (AFD) is proposed and its hysteretic behavior is experimentally studied. Then\nthe device is applied to container crane based on a seesawmechanism.Themajor advantage of the seesawdamping systemis that the\nlong tension cables can be utilized as bracing between the seesawmember and the portal legs to avoid compression and buckling of\nthe cables. A simplified trilinear force-displacementmodel on the basis of experimental results is adopted to represent the hysteretic\nbehavior of AFD. After that, seismic responses of container crane with and without dampers to four earthquakes are studied using\nnonlinear dynamic time-history analysis. Besides this system, a diagonal-brace-AFD system is studied for comparison. A method\nbased on the displacement and energy dissipation ratio is proposed to find the optimum slip force for seesaw damping system.\nPerformance of AFD control system is assessed though various parameters including displacement and maximum portal frame\ndrift angle. Results prove a feasible application of AFD control system to absorb large amounts of seismic energy and significantly\nreduce the structural responses.
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