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Maximum stress in concrete by code is restricted to ______.
- a)0.67fck
- b)0.447fck
- c)0.87fck
- d)0.53fck
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Maximum stress in concrete by code is restricted to ______.a)0.67fckb)...
The assumption made according to IS 456 in limit states of collapse are:
- Plane section normal to the axis remains plane after bending.
- The maximum strain in the concrete at the outermost compression fiber can be taken as 0.0035 in bending.
- The tensile strength of the concrete is ignored.
- The relationship between stress-strain distribution in concrete is assumed to be parabolic.
Hence, Maximum stress in concrete by code is restricted to 0.67fck.
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Maximum stress in concrete by code is restricted to ______.a)0.67fckb)...
Maximum stress in concrete by code is restricted to 0.67fck
The maximum stress in concrete is restricted by code to ensure the safety and durability of the structure. The value of 0.67fck is derived from the design codes and standards followed in the field of civil engineering. Let's understand the significance of this value and why it is chosen as the maximum stress limit for concrete.
Understanding the terms:
- Stress: Stress is the force per unit area acting on a material. In the case of concrete, it is the internal resistance experienced by the material when subjected to external loads.
- fck: fck refers to the characteristic compressive strength of concrete. It is the strength of concrete at 28 days curing period. The value of fck is determined through laboratory tests and is specified in the design codes.
Importance of maximum stress limit:
The maximum stress limit is imposed in order to prevent the concrete from reaching its failure point or undergoing excessive deformation. If the stress exceeds the maximum limit, it can lead to various problems such as cracking, failure, and reduced service life of the structure. By restricting the stress within a safe range, the durability and structural integrity of the concrete can be ensured.
Derivation of the 0.67fck value:
The value of 0.67 is derived based on extensive research, testing, and analysis. It is a conservative value chosen to provide an adequate margin of safety for the concrete. The factor of 0.67 takes into account the following factors:
- Variability in concrete strength: Concrete is a heterogeneous material, and there can be variations in its strength. The factor of 0.67 accounts for this variability and ensures that even the lower strength concrete can withstand the applied loads.
- Uncertainties in material properties: There are uncertainties associated with the material properties of concrete, such as the strength of aggregates, water-cement ratio, curing conditions, etc. The value of 0.67 provides a safety factor to account for these uncertainties.
- Serviceability and durability requirements: The maximum stress limit also considers the serviceability and durability requirements of the structure. Excessive stress can lead to cracking, deflection, and other serviceability issues. By restricting the stress to 0.67fck, the structure can meet the desired serviceability and durability criteria.
Conclusion:
In conclusion, the maximum stress in concrete by code is restricted to 0.67fck. This value is derived based on considerations of safety, variability in concrete strength, uncertainties in material properties, and serviceability requirements. By adhering to this limit, the concrete can effectively resist the applied loads and ensure the long-term performance of the structure.
The maximum stress in concrete is restricted by code to ensure the safety and durability of the structure. The value of 0.67fck is derived from the design codes and standards followed in the field of civil engineering. Let's understand the significance of this value and why it is chosen as the maximum stress limit for concrete.
Understanding the terms:
- Stress: Stress is the force per unit area acting on a material. In the case of concrete, it is the internal resistance experienced by the material when subjected to external loads.
- fck: fck refers to the characteristic compressive strength of concrete. It is the strength of concrete at 28 days curing period. The value of fck is determined through laboratory tests and is specified in the design codes.
Importance of maximum stress limit:
The maximum stress limit is imposed in order to prevent the concrete from reaching its failure point or undergoing excessive deformation. If the stress exceeds the maximum limit, it can lead to various problems such as cracking, failure, and reduced service life of the structure. By restricting the stress within a safe range, the durability and structural integrity of the concrete can be ensured.
Derivation of the 0.67fck value:
The value of 0.67 is derived based on extensive research, testing, and analysis. It is a conservative value chosen to provide an adequate margin of safety for the concrete. The factor of 0.67 takes into account the following factors:
- Variability in concrete strength: Concrete is a heterogeneous material, and there can be variations in its strength. The factor of 0.67 accounts for this variability and ensures that even the lower strength concrete can withstand the applied loads.
- Uncertainties in material properties: There are uncertainties associated with the material properties of concrete, such as the strength of aggregates, water-cement ratio, curing conditions, etc. The value of 0.67 provides a safety factor to account for these uncertainties.
- Serviceability and durability requirements: The maximum stress limit also considers the serviceability and durability requirements of the structure. Excessive stress can lead to cracking, deflection, and other serviceability issues. By restricting the stress to 0.67fck, the structure can meet the desired serviceability and durability criteria.
Conclusion:
In conclusion, the maximum stress in concrete by code is restricted to 0.67fck. This value is derived based on considerations of safety, variability in concrete strength, uncertainties in material properties, and serviceability requirements. By adhering to this limit, the concrete can effectively resist the applied loads and ensure the long-term performance of the structure.
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