ICS 47.020.99;93.140                          CED 39

Reaffirmed 2021

1. Scope

1.1 This standard covers the requirements for designing and detailing of members of reinforced concrete (RC) structures designed to resist lateral effects of earthquake shaking, so as to give them adequate stiffness, strength and ductility to resist severe earthquake shaking without collapse. Even though the general concepts adopted in this standard for structures are also applicable for RC bridge systems, provisions of this standard shall be taken only as a guide for RC bridge piers and wells of large cross-sections, but are not sufficient. This standard addresses lateral load resisting structural systems ofRC structures composed of,

a) RC moment resisting frames,

b) RC moment resisting frames with unreinforced masonry infill walls,

c) RC moment resisting frames with RC structural walls, and

(d) RC structural walls.

1.1.1 Provisions of this standard shall be adopted in all lateral load resisting systems of RC structures located in Seismic Zone 111, IV or V. The standard is optional in Seismic Zone II.

1.1.2 The provisions for RC structures given herein apply speci?cally to monolithic RC construction, and not for precast RC structures. Precast and/or pre stressed concrete members may be used, only if they are designed to provide similar level ofductility as that of monolithic RC structures during or after an earthquake. Likewise, ?at slab structures must have a lateral load resisting system capable of providing similar level of performance as envisioned in this standard and must be designed for drift compatibility as per 11. Specialist literature must be referred to for design and construction of such structures. The adequacy of such designs shall be demonstrated by adequate, appropriate experimentation and nonlinear dynamic structural analyses.

1.1.3 All RC frames, RC walls and their elements in a structure need not be designed to resist lateral loads and the designer can judiciously identify the lateral load resisting system based on relative stiffness and location in the building and design those members for full lateral force. RC monolithic members assumed not to participate in the lateral force resisting system (see 3.7) shall be permitted provided that their effect on the seismic response of the system is accounted for. Consequence offailure ofstructural and non-structural members not part of the lateral force resisting system shall also be considered in design.

2. REFERENCES

The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

456 : 2000 Plain and reinforced concrete - Code of Practice (fourth revision)

1343 : 2012 Code of Practice for prestressed concrete (second revision)

1786 : 2008 High strength deformed steel bars and wires for concrete reinforcement (fourth revision)

1893 Criteria for earthquake resistant design of structures

(Part 1) : 2002 General provisions and buildings (fifth revision)

(Part 2) : 2014 Liquid retaining tanks - Elevated and ground supported

(Part 4) : 2015 Industrial structures including stack like structures (first revision)

4326 : 2013 Earthquake resistant design and construction of buildings - Code of Practice (third revision)

16172 : 2014 Reinforcement couplers for mechanical splices ofbars in concrete - Specification