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A doubly reinforced beam is considered less economical than a singly reinforced beam because:
- a)Shear reinforcement is more
- b)Compressive steel is under stressed
- c)Tensile steel required is more than that for balanced section
- d)Concrete is not stressed to its full value
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A doubly reinforced beam is considered less economical than a singly r...
Explanation
- The correct answer, "Compressive steel is under stressed," is considered the crux of why a doubly reinforced beam is less economical than a singly reinforced beam because, in this configuration, the additional steel provided on the compression side does not contribute as effectively as the tensile reinforcement.
- The compressive steel, being under-stressed, implies that it does not work to its full potential, leading to an inefficient use of material which makes the beam design less cost-effective compared to a singly reinforced beam where materials are generally utilized more efficiently.
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A doubly reinforced beam is considered less economical than a singly r...
Compressive Steel is Under Stressed in Doubly Reinforced Beams
In a doubly reinforced beam, both the tension and compression zones of a beam have reinforcement, while in a singly reinforced beam, only the tension zone has reinforcement. Here are the reasons why a doubly reinforced beam is considered less economical than a singly reinforced beam:
1. Shear Reinforcement is More
Since doubly reinforced beams have more reinforcement, they also require more shear reinforcement. This increases the cost of materials and construction.
2. Tensile Steel Required is More than that for Balanced Section
In a doubly reinforced beam, the amount of tensile steel required is more than that for a balanced section, where the steel is just enough to resist the tension forces. This means more steel is used, which increases the cost.
3. Concrete is Not Stressed to its Full Value
In a doubly reinforced beam, the compression steel is not stressed to its full value, which means that the concrete is not stressed to its full value either. This reduces the efficiency of the beam and increases the cost of materials.
4. Compressive Steel is Under Stressed
The main reason why a doubly reinforced beam is considered less economical than a singly reinforced beam is that the compressive steel is under stressed. Since the compression steel is not stressed to its full value, it is not being utilized efficiently. This means that more steel is required to achieve the required strength, which increases the cost.
Conclusion
In summary, a doubly reinforced beam is considered less economical than a singly reinforced beam because it requires more shear reinforcement, more tensile steel, and the concrete is not stressed to its full value. However, the main reason is that the compressive steel is under stressed, which increases the amount of steel required and the cost of materials.
In a doubly reinforced beam, both the tension and compression zones of a beam have reinforcement, while in a singly reinforced beam, only the tension zone has reinforcement. Here are the reasons why a doubly reinforced beam is considered less economical than a singly reinforced beam:
1. Shear Reinforcement is More
Since doubly reinforced beams have more reinforcement, they also require more shear reinforcement. This increases the cost of materials and construction.
2. Tensile Steel Required is More than that for Balanced Section
In a doubly reinforced beam, the amount of tensile steel required is more than that for a balanced section, where the steel is just enough to resist the tension forces. This means more steel is used, which increases the cost.
3. Concrete is Not Stressed to its Full Value
In a doubly reinforced beam, the compression steel is not stressed to its full value, which means that the concrete is not stressed to its full value either. This reduces the efficiency of the beam and increases the cost of materials.
4. Compressive Steel is Under Stressed
The main reason why a doubly reinforced beam is considered less economical than a singly reinforced beam is that the compressive steel is under stressed. Since the compression steel is not stressed to its full value, it is not being utilized efficiently. This means that more steel is required to achieve the required strength, which increases the cost.
Conclusion
In summary, a doubly reinforced beam is considered less economical than a singly reinforced beam because it requires more shear reinforcement, more tensile steel, and the concrete is not stressed to its full value. However, the main reason is that the compressive steel is under stressed, which increases the amount of steel required and the cost of materials.
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A doubly reinforced beam is considered less economical than a singly reinforced beam because:a)Shear reinforcement is moreb)Compressive steel is under stressedc)Tensile steel required is more than that for balanced sectiond)Concrete is not stressed to its full valueCorrect answer is option 'B'. Can you explain this answer?
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A doubly reinforced beam is considered less economical than a singly reinforced beam because:a)Shear reinforcement is moreb)Compressive steel is under stressedc)Tensile steel required is more than that for balanced sectiond)Concrete is not stressed to its full valueCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A doubly reinforced beam is considered less economical than a singly reinforced beam because:a)Shear reinforcement is moreb)Compressive steel is under stressedc)Tensile steel required is more than that for balanced sectiond)Concrete is not stressed to its full valueCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A doubly reinforced beam is considered less economical than a singly reinforced beam because:a)Shear reinforcement is moreb)Compressive steel is under stressedc)Tensile steel required is more than that for balanced sectiond)Concrete is not stressed to its full valueCorrect answer is option 'B'. Can you explain this answer?.
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