Locations of isolation system and choice of bearings

Vertical locations of isolation layers are discussed in order to optimize isolation design and encourage development of technique. Isolation system under ±0.00 floor board is different from the base under basement in follow four aspects. First, the part of basement with single-storey upper structure needs not to be isolated in former case. Second, vertical load on isolation system including the cellar itself is much greater in later case. Third, because of irregular plan, deformation of isolation system is much greater in later case. Fourth, in the example project, bearings cost is increased by 37.4% comparing to the former case. For a building structure with large and very unregulated plan, it is an economy isolation design to divide the building structure into several regulated structures and to be isolated each under their first floor.