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Which of the following is a primary cause of flexural collapse in over-reinforced beams?
- a)Relative movement between steel and concrete
- b)Failure of bond
- c)Primary compression failure
- d)Primary tension failure
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Which of the following is a primary cause of flexural collapse in over...
When the stress in concrete reaches its permissible value before steel, then the section is fail with sudden collapse of the structure. The resulting beam is known as over-reinforced beam.
The primary failure (occurs first) in an over reinforced beam is compression failure, as the crushing of concrete occurs before yielding of the tension reinforcement.
Primary compression failure means first concrete will fail in compression, secondary compression failure means first steel will fail in tension and after that concrete will fail in compression because it will reach its permissible value first than steel, that’s why it is primary compression failure.
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Which of the following is a primary cause of flexural collapse in over...
Primary Compression Failure as the Cause of Flexural Collapse in Over-reinforced Beams
Primary compression failure is the primary cause of flexural collapse in over-reinforced beams. It occurs when the concrete in the compression zone reaches its ultimate compressive strength before the steel reinforcement in the tension zone reaches its yield strength. This results in the concrete crushing and the steel yielding, leading to a sudden collapse of the beam.
Factors Contributing to Primary Compression Failure
There are several factors that contribute to primary compression failure in over-reinforced beams, including:
1. Excessive Reinforcement: When the amount of steel reinforcement is too high, it can cause the concrete to fail in compression before the steel yields in tension.
2. High Concrete Strength: If the concrete used in the beam has a high compressive strength, it will be more resistant to failure in compression, causing the steel to yield before the concrete fails.
3. Short Span Length: A shorter span length will result in higher shear and bending stresses, which can cause the concrete to fail in compression before the steel yields in tension.
4. Low Ductility of Steel: If the steel used in the beam has low ductility, it will not be able to withstand the high stresses that occur during primary compression failure.
Conclusion
In summary, primary compression failure is the primary cause of flexural collapse in over-reinforced beams. It occurs when the concrete in the compression zone reaches its ultimate compressive strength before the steel reinforcement in the tension zone reaches its yield strength. Factors such as excessive reinforcement, high concrete strength, short span length, and low ductility of steel can contribute to primary compression failure.
Primary compression failure is the primary cause of flexural collapse in over-reinforced beams. It occurs when the concrete in the compression zone reaches its ultimate compressive strength before the steel reinforcement in the tension zone reaches its yield strength. This results in the concrete crushing and the steel yielding, leading to a sudden collapse of the beam.
Factors Contributing to Primary Compression Failure
There are several factors that contribute to primary compression failure in over-reinforced beams, including:
1. Excessive Reinforcement: When the amount of steel reinforcement is too high, it can cause the concrete to fail in compression before the steel yields in tension.
2. High Concrete Strength: If the concrete used in the beam has a high compressive strength, it will be more resistant to failure in compression, causing the steel to yield before the concrete fails.
3. Short Span Length: A shorter span length will result in higher shear and bending stresses, which can cause the concrete to fail in compression before the steel yields in tension.
4. Low Ductility of Steel: If the steel used in the beam has low ductility, it will not be able to withstand the high stresses that occur during primary compression failure.
Conclusion
In summary, primary compression failure is the primary cause of flexural collapse in over-reinforced beams. It occurs when the concrete in the compression zone reaches its ultimate compressive strength before the steel reinforcement in the tension zone reaches its yield strength. Factors such as excessive reinforcement, high concrete strength, short span length, and low ductility of steel can contribute to primary compression failure.
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Which of the following is a primary cause of flexural collapse in over-reinforced beams?a)Relative movement between steel and concreteb)Failure of bondc)Primary compression failured)Primary tension failureCorrect answer is option 'C'. Can you explain this answer?
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