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The spacing between two vertical stirrups in a rectangular RCC beam is:
- a)Minimum near the supports
- b)Decreased towards the centre of the beam
- c)Maximum near the supports
- d)Minimum near the centre
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The spacing between two vertical stirrups in a rectangular RCC beam is...
The correct answer is option 'A': The spacing between two vertical stirrups in a rectangular RCC beam is minimum near the supports. This is because the maximum shear force occurs near the supports, and stirrups are provided to resist shear forces in a beam.
Explanation:
1. Importance of stirrups in RCC beams:
- In reinforced concrete beams, stirrups are used to provide lateral support and prevent the shear failure of the beam.
- They help in resisting the diagonal tension forces that develop in the beam due to the presence of shear forces.
2. Shear force distribution in a rectangular RCC beam:
- In a simply supported rectangular RCC beam, the shear force is maximum at the supports and gradually decreases towards the center of the beam.
- This variation in shear force is due to the load transfer mechanism and the bending moment distribution in the beam.
3. Role of stirrups in resisting shear forces:
- Stirrups are designed to resist the shear forces that occur along the length of the beam.
- They provide confinement to the concrete in the region where diagonal tension forces are developed.
- By providing adequate spacing between stirrups, the shear capacity of the beam is enhanced.
4. Determining the spacing of stirrups:
- The spacing between stirrups is determined based on the maximum shear force in the beam.
- Near the supports, where the shear force is maximum, the spacing between stirrups needs to be minimum to effectively resist the shear forces.
- As we move towards the center of the beam, where the shear force decreases, the spacing between stirrups can be increased.
5. Design considerations:
- The minimum spacing between stirrups is governed by practical considerations such as the diameter of the stirrup bars, the size of the aggregate used, and the ease of construction.
- The maximum spacing between stirrups is determined by the code provisions and the desired level of safety.
- The spacing between stirrups is usually kept constant within a particular region of the beam, except for special cases where the shear force distribution is non-uniform.
In conclusion, the spacing between two vertical stirrups in a rectangular RCC beam is minimum near the supports to effectively resist the maximum shear forces.
Explanation:
1. Importance of stirrups in RCC beams:
- In reinforced concrete beams, stirrups are used to provide lateral support and prevent the shear failure of the beam.
- They help in resisting the diagonal tension forces that develop in the beam due to the presence of shear forces.
2. Shear force distribution in a rectangular RCC beam:
- In a simply supported rectangular RCC beam, the shear force is maximum at the supports and gradually decreases towards the center of the beam.
- This variation in shear force is due to the load transfer mechanism and the bending moment distribution in the beam.
3. Role of stirrups in resisting shear forces:
- Stirrups are designed to resist the shear forces that occur along the length of the beam.
- They provide confinement to the concrete in the region where diagonal tension forces are developed.
- By providing adequate spacing between stirrups, the shear capacity of the beam is enhanced.
4. Determining the spacing of stirrups:
- The spacing between stirrups is determined based on the maximum shear force in the beam.
- Near the supports, where the shear force is maximum, the spacing between stirrups needs to be minimum to effectively resist the shear forces.
- As we move towards the center of the beam, where the shear force decreases, the spacing between stirrups can be increased.
5. Design considerations:
- The minimum spacing between stirrups is governed by practical considerations such as the diameter of the stirrup bars, the size of the aggregate used, and the ease of construction.
- The maximum spacing between stirrups is determined by the code provisions and the desired level of safety.
- The spacing between stirrups is usually kept constant within a particular region of the beam, except for special cases where the shear force distribution is non-uniform.
In conclusion, the spacing between two vertical stirrups in a rectangular RCC beam is minimum near the supports to effectively resist the maximum shear forces.
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The spacing between two vertical stirrups in a rectangular RCC beam is...
Assuming a simply supported reinforced concrete beam carrying uniformly distributed load of intensity w kN/m over the span length 'L'.
The maximum shear force would be produced at the supports and the shear force at the center of the span is zero.
∴ The maximum shear resistance is required at the ends of the supports and the minimum at the center of the span.
Shear reinforcement shall be provided in any of the following forms:
a) Vertical stirrups
b) The bent-up bar along with stirrups
c) Inclined stirrups
The maximum shear force would be produced at the supports and the shear force at the center of the span is zero.
∴ The maximum shear resistance is required at the ends of the supports and the minimum at the center of the span.
Shear reinforcement shall be provided in any of the following forms:
a) Vertical stirrups
b) The bent-up bar along with stirrups
c) Inclined stirrups
Important Points
- Stirrups are provided to take up the shear stress in the rectangular beam.
- Spacing is the distance between each consecutive stirrup.
- And we know from earlier that the shear force acts more near the support
- So to take up that shear stress, more stirrups need to be present at the support rather than the middle of the beam.
Note that, the shear reinforcement increases as the spacing among the stirrups decreases and vice versa.
As the shear strength requirement is more at the supports than the center, the spacing of stirrups decreases towards the end of the beam.
As the shear strength requirement is more at the supports than the center, the spacing of stirrups decreases towards the end of the beam.
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The spacing between two vertical stirrups in a rectangular RCC beam is:a)Minimum near the supportsb)Decreased towards the centre of the beamc)Maximum near the supportsd)Minimum near the centreCorrect answer is option 'A'. Can you explain this answer?
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