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 Respones to "What is Modular Ratio? Modular Ratio in RCC(Reinforced Cement Concrete)"
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??
March 6, 2016 at 12:15 AM
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.
May 1, 2016 at 1:27 PM
thnQ Mr.Alok Modi
May 2, 2016 at 9:08 AM
What is value of m for rcc beam having m20 and fe 415? ?
February 16, 2017 at 9:41 PM
For m20 value of fcbc is 7 then m=280/(3*7)=13.33
March 13, 2017 at 12:04 AM
What r the Defects.of modular ratio
March 24, 2017 at 12:51 AM
What r the Defects.of modular ratio
March 24, 2017 at 12:52 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.
May 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.
May 4, 2017 at 12:40 AM
How can I get the formula m=280/3(sigma CBC)
August 23, 2017 at 5:43 AM
is the modular ratio different for different type steel?
August 5, 2018 at 8:38 AM
meaning of fcbc
November 14, 2018 at 9:37 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.
August 2, 2019 at 12:01 AM
Both posts ND comments are worth a whole lesson note. Thanks
October 1, 2019 at 3:43 AM
Reciprocal of modular ratio is called what ratio.
January 4, 2020 at 6:48 AM
It's sigma cbc
February 19, 2020 at 9:12 AM
How do we know value of sigma cbc value for different concrete grades
February 19, 2020 at 9:15 AM
How you get 280/3σcbc this derive it
?
July 24, 2020 at 5:19 PM
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