Important Civil Engineering Formulas From IS 456:2000
There are many important formula in IS:456 & yes it is very difficult to the remember each and every formula in the IS 456:2000. As the civil engineer u must know those useful formula when u work at site. In this article, I will explain some useful formula from IS:456 civil engineer must remember. we also advice u to go through the entire code for once & focus more on these areas.
Nominal Cover to meet the durability requirements.
Not less than
20 mm for the mild exposure.
30 mm for the moderate exposure.
45 mm for the severe exposure.
50 mm for very severe exposure.
75 mm for extreme exposure.
Reference: Table 16 of IS 456:2000
Go through Table 16 A of IS 456:2000 also. (For the fire resistance).
When u start working at the site, the cover that needs to be provided will be main concern.
Know some properties of the materials as per the code.
The nominal maximum size of the course aggregates should not be greater that 1/4th of the thickness of the member. (Refer to the clause 5.3.3 of IS 456:2000 for more details.)
Modulus of elasticity of the steel Es can be taken as 200 Kn/m2 .(Refer to the clause 5.6.3 of IS 456:2000 for more details).
Modulus of elasticity of the concrete Ec = 5000 √fck
where fck is Characteristic compressive strength of the concrete in 28 days.
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deflection angle with theodolite
(Refer to the clause 6.2.1 of IS 456:2000 for more details.)
Unless more accurate calculations are warranted, the unit weights of plain concrete & reinforced concrete made with sand & gravel or crushed natural stone aggregate may be taken as 24 kN/m3 & 25 kN/m3 respectively. (Refer to the clause 19.2 of IS 456:2000 for more details.)
Span to Depth ratio of the beams are very important. (Refer to the clause 23.2.1 of IS 456:2000 for more details.)
Basics of working stress design & Limit stress design are also very important. Just go through those clauses once in the while. You’ll at least know where to find the information required.
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