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CONTROLLED DAMPER ASSEMBLIES FOR PROTECTING BASE ISOLATED STRUCTURES FROM THE EFFECTS OF SEISMIC DISTURBANCES: DAMPERS TRANSFORM DIRECTION OF FORCES AND DISPLACEMENT INTO CORRESPONDING OPPOSITELY DIRECTED FORCES AND DISPLACEMENT
CONTROLLED DAMPER ASSEMBLIES FOR PROTECTING BASE ISOLATED STRUCTURES FROM THE EFFECTS OF SEISMIC DISTURBANCES: DAMPERS TRANSFORM DIRECTION OF FORCES AND DISPLACEMENT INTO CORRESPONDING OPPOSITELY DIRECTED FORCES AND DISPLACEMENT
A damping subsystem protects a structure from the effects of seismic disturbances and employs at least a first pair of first and second damping and transformation mechanisms including respective, associated first dampers oriented in parallel relationship in a first direction and oppositely disposed relatively to the center of gravity of the structure and mechanically connected between respectively corresponding portions of the structure and the foundation in relatively inverse relationship. Each mechanism transforms a force transferred to the associated first damper from the foundation in the first direction and/or any lateral, relative displacement of the corresponding structure and foundation portion in the first direction to a corresponding force and/or displacement, respectively, in a second direction perpendicular to the first direction, each also performing the reverse transformation. A mechanical interconnection between the first and second damping and transformation mechanisms transfers any such transformed force and/or displacement of the second direction from one to the other of the pair of first and second damping and transformation mechanisms, thereby to impede rotation of the structure relatively to the foundation. The respective, associated first dampers of the pair of mechanisms provide individually controllable damping of lateral displacement between the corresponding structure and foundation portions in the first direction.
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