In considering supplemental damping for a project, immediate questions that the structural engineer must address are: 1) Is the building suitable for supplemental damping; 2) How much damping should be provided; and 3) How should the dampers be distributed in the building? These are issues that need to be resolved irrespective of the type of damper used. The evaluation in this paper shows that supplemental damping is ideally suited for flexible frame buildings, or buildings detailed to accommodate interstory drift ratios of about 0.01 without significant damage. Providing 10% to 20% supplemental damping reduces response significantly for most structures. Providing more damping is difficult to justify from a cost-benefit perspective. Providing less supplemental damping can reduce earthquake response for structures having only small amounts of inherent damping; e.g., 1% to 2%. For most buildings having predominant fundamental mode response, the distribution of dampers in a structure is determined mostly from designing to carry the damper lateral forces. Frame member stresses, plan stiffness regularity, and elevation stiffness regularity are critical design considerations for establishing damper distributions in buildings.

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