In this dissertation, one of major objective is to investigate and asses the effect of the conventional seismic isolation systems, and to determine the main effective parameters on the isolators performance.The dissertation presented a complete design aids to take the environmental bad side effects on the mechanical properties of the isolators, and it presented the numerical analysis of isolators with the different bounding of isolators.This evaluation will be the way to develop a new system. The new system is called by [DISTM], Double Isolation Surfaces with Tuned Mass. In this...