New Standard from Last Update.

1. SCOPE

1.1 This standard provides requirements for base isolated buildings, which shall be designed and constructed to resist earthquake induced effects (namely displacements and forces) as specified herein. The provisions of this standard are applicable only to:

a) Conventional monolithic RC buildings and steel frame buildings, excluding those with pure flat slabs or with precast elements based lateral load resisting systems that are, not covered by IS 1893 (Part 1); and

b) Buildings with base-isolation devices, such as elastomeric and sliding systems, all of which are located at the same level only, along the height of the building (and not at multiple levels).

1.2 Buildings with base-isolation devices are expected to perform better than the conventional fixed-base buildings, especially in terms of damage in the structural and non-structural elements in the superstructure above the isolation level.

1.3 The underlying principles of the provisions of this standard are:

a) Base-isolated buildings designed using this standard shall perform better than the corresponding fixed-base buildings when subjected to ground motions expected in the applicable the Seismic Zone; and

b) The desired sequence of location of damage is superstructure, isolators, substructure and foundation.

1.4 This standard suggests the estimation of design earthquake lateral forces and displacements to be considered and the method of structural analysis to be adopted, in the design of buildings with base isolation systems, and the specifications and method of testing of the base isolators that are proposed to be used in such buildings.