Question
Download Solution PDFWhat is modular ratio of concrete grade M30 when effect of creep is NOT considered?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Modular ratio:
In the elastic theory for the reinforced concrete structure, concrete and reinforcing steel are converted into one material. This is done by using the modular ratio ‘m’.
It is the ratio of modulus of elasticity of steel and concrete.
However, concrete has varying moduli, as it is not a perfectly elastic material.
Short term modulus of elasticity:
The short-term modulus of elasticity is given by
Long term modulus of elasticity:
The long-term modulus of elasticity is considered to take into account the effect of creep and shrinkage.
The modular ratio is taken as
where σcbc is permissible compressive stress in concrete in bending.
Calculation:
Grade of concrete = M30
Modular ratio ‘m’ (without considering creep effect)
Last updated on May 19, 2025
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