Table of Contents
Where is modular ratio used?
for example in rcc steel and concrete are used so ratio of ES to Ec is modular ratio. in the case of composite section it is used. it affect the ductility of the composite section and behaviour under different loading conditions, such as tension & compression.
Why modular ratio is used in working stress method?
Explanation: Modular ratio: In the case of working stress method of analysis, the composite section of reinforced concrete is transformed into an equivalent section of single material of concrete. For this, we need to define modular ratio which is the ratio of elastic modulus of steel to concrete.
What is the modular ratio in concrete?
In the case of reinforced concrete structure modular ratio is the ratio of elasticity modulus of steel and concrete. The value of of stresses in concrete and steel is related using modular ratio. As the strain in the reinforcing steel and concrete is linear in nature.
What is the modular ratio to be used in the analysis of RC beams using WSM If grade of concrete is M20?
Calculation of Modular ratio values for different grades of concrete
| Grade of concrete | Modular ratio |
|---|---|
| M15 | m = 280/3×5 = 18.66 |
| M20 | m = 280/3×7 = 13.33 |
| M25 | m = 280/3×8.5 = 10.98 |
| M30 | m = 280/3×10 = 9.33 |
What is modular ratio and its significance?
Modular ratio is the ratio of the modulus of elasticity of two different materials. If E1 and E2 are the Young’s modulus of two materials, then the ratio E1/E2 or E2/E1 is known as modular ratio. In structures involving composite materials this modular ratio plays a significant role in the load shared by the materials.
What is the modular ratio to be used in the analysis of RC beams using working stress method if the grade of concrete is M25?
As per IS 456 : 2000, using working stress method, the modular ratio of M25 grade of concrete for permissible compressive strength due to bending in concrete σcbc = 8.5 MPa is: 15.63.
Why modular ratio is not used in LSM?
The real strength of the structure is not completely utilized by the structure. This won’t give the true factor of safety of the structure when it is under failure. The modular ratio design will end up giving a structure with a large percentage of steel and uneconomical design.
What is meant by the modular ratio and Poisson’s ratio give approximate values for concrete?
Most materials have Poisson’s ratio values ranging between 0.0 and 0.5….Poisson’s ratio values for different materials.
| Material | Poisson’s ratio |
|---|---|
| concrete | 0.1–0.2 |
| glass | 0.18–0.3 |
| metallic glasses | 0.276–0.409 |
| foam | 0.10–0.50 |
What is modular ratio formula?
In the reinforced concrete structure, concrete and reinforcing steel are, therefore, converted into one material. This is done by transformation using the modular ratio m which is the ratio of modulus of elasticity of steel and concrete. Thus, m = Es/Ec.
What is the effect of creep on modular ratio?
Long term modulus of elasticity: The long-term modulus of elasticity is considered to take into account the effect of creep and shrinkage. where σcbc is permissible compressive stress in concrete in bending. ∴ Modular ratio increases if the creep effect is considered.
What do you mean by modular ratio Mcq?
linear stress to linear strain. shear stress to shear strain. their modulus of elasticity’s. their modulus of rigidity.