Behaviour of equipment mounted over a torsionally coupled structure with sliding support

摘要

Behaviour of a ligh equipment system mounted over a torsionally coupled and sliding primary system, is studied under bidirectional ground excitation. A fictitious spring model is considered in the analysis to deal with the discontinutiy nautre of the sliding sturcutral system. The rigid friction-froce deformation characteristics of a sliding base are modelled as elasto-plastic with high elastic stiffness. The sliding strucutre behaves as an elastic system during the sliding phase and as a plastic system during the non-sliding phase. Responses of the equpment system are calculted by considering interaction and non-interaction between the primary system and the equipment system as well as non-interaction between the lateral and torsional resistnaces at the sliding support. The results presented here are of itnerest in the area of vibration isolation of important structural systems.