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The allowable shear stress is stiffened webs of mild steel beams decreases with
- a)decreases in the spacing of the stiffeners
- b)increases in the spacing of the stiffeners
- c)decrease in the effective depth
- d)increase in the effective depth
Correct answer is option 'B'. Can you explain this answer?
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The allowable shear stress is stiffened webs of mild steel beams decre...
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The allowable shear stress is stiffened webs of mild steel beams decre...
Explanation:
The allowable shear stress in stiffened webs of mild steel beams decreases with increases in the spacing of the stiffeners.
Reason:
The stiffeners in a steel beam are typically used to increase its resistance to shear forces. They are attached to the web of the beam to provide additional support and prevent buckling.
When the spacing of the stiffeners is increased, the effectiveness of the stiffeners in resisting shear forces decreases. This is because the load is spread out over a larger area between the stiffeners, reducing the overall contribution of each stiffener. As a result, the shear stress on the web increases, and the allowable shear stress decreases.
Effect of Decreasing Stiffener Spacing:
- When the spacing of the stiffeners is decreased, the load is concentrated on a smaller area between the stiffeners.
- This increases the contribution of each stiffener in resisting shear forces.
- As a result, the shear stress on the web decreases, and the allowable shear stress increases.
Effect of Decreasing the Effective Depth:
- The effective depth of a beam is the distance between the extreme compression fiber and the centroid of the tensile reinforcement.
- When the effective depth is decreased, the lever arm for the resisting moment decreases.
- This leads to an increase in the bending stress on the beam and can result in failure due to bending, not shear.
- Therefore, the decrease in effective depth does not directly affect the allowable shear stress.
Conclusion:
In summary, the allowable shear stress in stiffened webs of mild steel beams decreases with increases in the spacing of the stiffeners. This is because the effectiveness of the stiffeners in resisting shear forces decreases when the spacing is increased. The decrease in the effective depth of the beam does not directly affect the allowable shear stress.
The allowable shear stress in stiffened webs of mild steel beams decreases with increases in the spacing of the stiffeners.
Reason:
The stiffeners in a steel beam are typically used to increase its resistance to shear forces. They are attached to the web of the beam to provide additional support and prevent buckling.
When the spacing of the stiffeners is increased, the effectiveness of the stiffeners in resisting shear forces decreases. This is because the load is spread out over a larger area between the stiffeners, reducing the overall contribution of each stiffener. As a result, the shear stress on the web increases, and the allowable shear stress decreases.
Effect of Decreasing Stiffener Spacing:
- When the spacing of the stiffeners is decreased, the load is concentrated on a smaller area between the stiffeners.
- This increases the contribution of each stiffener in resisting shear forces.
- As a result, the shear stress on the web decreases, and the allowable shear stress increases.
Effect of Decreasing the Effective Depth:
- The effective depth of a beam is the distance between the extreme compression fiber and the centroid of the tensile reinforcement.
- When the effective depth is decreased, the lever arm for the resisting moment decreases.
- This leads to an increase in the bending stress on the beam and can result in failure due to bending, not shear.
- Therefore, the decrease in effective depth does not directly affect the allowable shear stress.
Conclusion:
In summary, the allowable shear stress in stiffened webs of mild steel beams decreases with increases in the spacing of the stiffeners. This is because the effectiveness of the stiffeners in resisting shear forces decreases when the spacing is increased. The decrease in the effective depth of the beam does not directly affect the allowable shear stress.
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The allowable shear stress is stiffened webs of mild steel beams decreases witha)decreases in the spacing of the stiffenersb)increases in the spacing of the stiffenersc)decrease in the effective depthd)increase in the effective depthCorrect answer is option 'B'. Can you explain this answer?
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