One Day Seminar on Proposed Revision of IS 456:2000 Plain and Reinforced Concrete and IS 1343:2012 Prestressed Concrete - Codes


Venue: Nehru Science Centre, Mumbai


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Organised by: SEFI
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Price: Rs.2,000.00

IS:456 Seminar Mumbai, 28 March 2020

 Note from the Code Drafting Team



Revision of

IS 456 Code of Practice for Plain and Reinforced Concrete

IS 1343 Code of Practice for Prestressed Concrete




The proposed Fifth Revision of the Indian Standard IS456 aims to addresses advances made in the state-of-the-art internationally and in the state-of-the-practice in India in design and construction of structural concrete. In particular, it is expected to addresses the significant developments that have taken place over the last two decades in the fields of concrete technology and the durability of concrete structures. Also, over the last four decades, design engineering has seen major changes. Hence, this revision attempts to bring in an improved understanding of structural behavior, some of which have been raised regularly during structural design, peer review and proof-checking of concrete structures in India. This revision is expected to incorporate a number of important changes.



The salient changes in the draft under consideration are:


(1) The provisions now are required to address three types of concretes, namely PlainReinforced and Prestressed Concretes. As a consequence, the title of the unified standard is proposed to be revised as the Indian Standard Code of Practice for Structural Concrete.

(2) The basis of design will be elaborated. The draft standard now requires concrete structures to be designed for 6 limit states, namely SafetyServiceability, DurabilityRobustnessIntegrity, and Restorability. Each limit state is deemed to have been designed for if the structural design is demonstrated to meet the requirements laid down in the standard.

(3) High strength concretes and reinforcing steels have been considered in the drafting of the provisions in this revision.

(4) In general, the basic principles of design are proposed to be retained. Axial and flexural capacities are based on strain considerations, and shear and torsion capacities on strength considerations.

(5) In the Limit State of Safety, the definition of design strength in flexure of a concrete member is proposed to be revised from that corresponding to secondary compression failure of the member to that corresponding to reaching limiting strains.

(6) The concept of design life is expected to be introduced quantitatively.

(7) Provisions related to serviceabilitydurability and fire resistance are expected to be harmonized and rationalized.

(8) The drafting is completely new with different and additional chapters. Also, the nomenclature is being changed now to reflect the unfactoredfactored and overstrength demands and capacities of concrete members.

(9) The commentaries of the clauses of the fifth revision are being prepared alongside to give insights into the bases of the new provisions.