IS 456:2000 — Clause Reference

Grades of Concrete

Clause 6.1 classifies concrete by its 28-day characteristic compressive strength (fck) tested on 150 mm cubes. Grades ra…

Exposure Conditions & Durability Requirements

Clause 8 covers durability requirements. Clause 8.2 classifies the environment into five exposure conditions — Mild, Mod…

Formwork — Stripping Time & Requirements

Clause 11 specifies requirements for formwork design, construction, and removal. Table 11 gives the minimum period befor…

Effective Span of Beams and Slabs

Clause 23.2 defines the effective span used for analysis and design of beams and slabs. The effective span depends on th…

Development Length of Bars

Clause 26.2.1 specifies the development length (Ld) required to develop the design stress in reinforcement through bond …

Lap Length & Splicing of Reinforcement

Clause 26.2.5 specifies requirements for lapping (splicing) reinforcement bars. Lap length depends on the development le…

Nominal Cover to Reinforcement

Clause 26.4 specifies the minimum concrete cover (clear distance from the nearest surface of concrete to the surface of …

Spacing of Reinforcement

Clause 26.5 specifies minimum and maximum spacing limits for reinforcement. Minimum spacing ensures proper concrete comp…

Limit State of Collapse — Flexure

Clause 38.1 gives the theory and design procedure for flexural members (beams and slabs) under the limit state of collap…

Limit State of Collapse — Short Column Under Axial Load

Clause 39.3 gives the design formula for short columns subjected to axial compression. A column is 'short' when the effe…

Nominal Shear Stress

Clause 40.1 defines the nominal shear stress τv as Vu/(b·d) for beams. This is compared against the design shear strengt…

Design of Shear Reinforcement

Clause 40.4 covers the design of shear reinforcement (stirrups and bent-up bars) to carry the shear force exceeding the …

Limit State of Serviceability — Deflection

Clause 43.1 (read with Clause 23.2.1) provides the deemed-to-satisfy span-to-depth ratio method for controlling deflecti…

Permissible Stresses — Working Stress Method

Annex B (Clause 46) covers the Working Stress Method (WSM), which was the primary design method before IS 456:2000 intro…

Effective Length of Columns

Annex E provides the effective length (le) of compression members based on end restraint conditions. The effective lengt…