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# Some vital points in IS 456:2000 Plain and Reinforced Concrete - Code of Practice

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It is too troublesome to understand each and every formula in IS 456:2000. It refers to Indian Standard code of practice for general structural utilization of plain and reinforced concrete.

The code applies the limit state design approach and working stress design approach.

It is very vital for a civil engineer to have clear ideas on these formulas while working on the construction site.

Explore through the entire code for one time and focus more on the following regions.

Minimal cover to match the necessities for strength: Not under -

20 mm for mild exposure.
30 mm for moderate exposure.
45 mm for severe exposure.
50 mm for very severe exposure.
75 mm for extreme exposure.

Reference: Table 16 of IS 456:2000

Explore through Table 16 A of IS 456:2000 also. (For fire resistance).

While performing at site, the cover should be the main concern to placed.

Given below, some properties of materials in line with the code.

The minimal & maximum size of course aggregates should not surpass1/4th of the thickness of member. (Follow the clause 5.3.3 of IS 456:2000 for more details.)

Modulus of elasticity of steel Es is considered as 200Kn/m2 (Following the clause 5.6.3 of IS 456:2000 for more details.)

Modulus of elasticity of concrete Ec = 5000 √fck
Here fck denotes Characteristic compressive strength of concrete in 28 days.
(Following the clause 6.2.1 of IS 456:2000 for more details.)

Usually, the unit weights of plain concrete and reinforced concrete developed with sand and gravel or crushed natural stone aggregate are considered as 24 kN/m3 and 25 kN/m3 correspondingly.
(Following the clause 19.2 of IS 456:2000 for more details.)

Span to Depth ratio of beams are very crucial.
(Following the clause 23.2.1 of IS 456:2000 for more details.)

Fundamental of Limit stress and working stress design are very crucial. Just get through those clauses once in a while.

Article Source : onlinecivilforum.com