New Standard from Last Update.

1. SCOPE

1.1 This standard covers the requirements for designing and detailing of structural components and members of steel buildings designed to resist lateral effects of earthquake shaking, so as to provide them with adequate stiffness, strength and ductility to resist severe earthquake shaking without collapse. The general concepts adopted in this standard for buildings are applicable also for other types of structures; in particular, provisions of this standard may be taken as a guide for design of components of industrial structures and steel bridges.

1.2 Provisions of this standard shall be adopted in the design of the following types of steel buildings located in seismic zones III, IV or V of IS 1893 (Part 1):

a) Residential, educational and institutional buildings;

b) Office and business buildings; and

c) Community, utility and lifeline buildings required for disaster management activities. The use of this standard is optional for design of steel buildings located in seismic zone II.

1.3 The provisions of this standard apply for design and detailing of steel buildings having the following structural systems:

a) Special moment resisting frame (SMRF);

b) Special concentrically braced frame (SCBF); and

c) Eccentrically braced frame (EBF).

In seismic zone V, all steel buildings shall be made of EBF systems; SCBFs shall not be used. In seismic zones IV and V, SMRFs may be used in buildings of height less than 15 m.

1.4 All steel frames in a building need not be designed to resist earthquake induced lateral loads. The designer can identify judiciously select frames to resist together the vertical loads and at least 80 percent of the effects of design earthquake lateral load and designate them as the lateral load resisting system. The other frames shall be designed to resist the effects imposed on them due to vertical loads and the deformation compatibility induced effects of earthquake shaking. Further, moments shall not be transferred to the designated lateral load resisting systems from frames spanning in perpendicular directions. Consequences of failure of structural members that are not part of the lateral load resisting system shall also be considered in design.

2. REFERENCES

The standards listed in Annex A contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standar ds are subject to revision, and parties to agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of these standards.