Sunday, August 14, 2011

What is Modular Ratio? Modular Ratio in RCC(Reinforced Cement Concrete)


Modular Ratio is defined as the Ratio between Modulus of Elasticity of Steel and Modulus of Elasticity of Concrete. This is because, a Reinforced Concrete is made up of Both Steel and Concrete. In this case, Steel is a Tension member and Concrete is a Compression Member. When Load is applied, a Rcc member seem to carry same load but strain produced in it is different. As per IS456:2000

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20 comments:

  1. songsMarch 6, 2016 at 12:15 AM

    modular ratio is a ratio of two different materials of elastic moduli.so it has no units.But, according to is456:2000 the formula is m=280/(3fcbc).the units for fcbc is N/mm^2..from this m get the units mm^2/N.. right??

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    Replies
    1. UnknownMay 1, 2016 at 1:27 PM

      No,m has no unit because 280/3 comes out by using elastic modulii in steel(2000MPa or N/mm2)& max allowable strain in concrete(unitless quantity).that's why 280/3 has unit of N/mm2 which will cancel out by unit of elasticity of concrete . Finally m is constant value no unit.

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    2. UnknownJuly 24, 2020 at 5:19 PM

      How you get 280/3σcbc this derive it
      ?

      Delete
  2. songsMay 2, 2016 at 9:08 AM

    thnQ Mr.Alok Modi

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  3. AnonymousFebruary 16, 2017 at 9:41 PM

    What is value of m for rcc beam having m20 and fe 415? ?

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  4. UnknownMarch 24, 2017 at 12:51 AM

    What r the Defects.of modular ratio

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  5. UnknownMarch 24, 2017 at 12:52 AM

    What r the Defects.of modular ratio

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  6. UnknownMay 4, 2017 at 12:39 AM

    By using m=280/3fcbc for m25 grade of concrete is 10.98 but by ratio of higest elastic moduli is 8. Is this correct, Because both the way is should be same,else which value should be taken while solving problems.

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  7. UnknownMay 4, 2017 at 12:40 AM

    By using m=280/3fcbc for m25 grade of concrete is 10.98 but by ratio of higest elastic moduli is 8. Is this correct, Because both the way is should be same,else which value should be taken while solving problems.

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  8. Deepak Kumar KeshriAugust 23, 2017 at 5:43 AM

    How can I get the formula m=280/3(sigma CBC)

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  9. UnknownAugust 5, 2018 at 8:38 AM

    is the modular ratio different for different type steel?

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    Replies
    1. Er. Avijit MandalAugust 2, 2019 at 12:01 AM

      modular ratio is the ratio of Modulus of Elasticity of steel to that of concrete.. i.e. m=Es/Ec , for all type of steel Es = 2×10^5 MPa..
      But Ec varies on Grade of concrete. So m depends only on Ec, Not on Es...
      For different type of steel m is same if Concrete grade is same.

      Delete
  10. Er. Avijit MandalAugust 1, 2019 at 11:59 PM

    This comment has been removed by the author.

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  11. blu penOctober 1, 2019 at 3:43 AM

    Both posts ND comments are worth a whole lesson note. Thanks

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  12. UnknownJanuary 4, 2020 at 6:48 AM

    Reciprocal of modular ratio is called what ratio.

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  13. Information provider @📳February 19, 2020 at 9:15 AM

    How do we know value of sigma cbc value for different concrete grades

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