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The allowable shear stress in stiffened webs of mild steel beams decreases with
- a)decrease in the spacing of the stiffeners
- b)increase 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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Most Upvoted Answer
The allowable shear stress in stiffened webs of mild steel beams decr...
Explanation:
Stiffened webs are used in steel beams to increase their load-carrying capacity. The stiffeners are provided to prevent buckling of the web under shear stresses. The allowable shear stress in stiffened webs of mild steel beams decreases with an increase in the spacing of the stiffeners. This can be explained as follows:
Spacing of Stiffeners
The spacing of the stiffeners refers to the distance between two adjacent stiffeners. It is usually expressed in terms of the ratio of the spacing to the web depth. The spacing of the stiffeners has a significant effect on the shear stress capacity of the stiffened web.
Effect of Increased Spacing of Stiffeners
When the spacing of the stiffeners is increased, the shear stress capacity of the stiffened web decreases. This is because the buckling stress of the web is directly proportional to the spacing of the stiffeners. When the spacing is increased, the buckling stress decreases, which results in a decrease in the shear stress capacity of the web. The buckling stress depends on the ratio of the effective depth of the web to the spacing of the stiffeners.
Effect of Decreased Spacing of Stiffeners
On the other hand, when the spacing of the stiffeners is decreased, the buckling stress of the web increases, which results in an increase in the shear stress capacity of the web. This is because the stiffeners provide lateral support to the web, and when the spacing is decreased, the lateral support increases, which results in an increase in the buckling stress of the web.
Conclusion
In conclusion, the allowable shear stress in stiffened webs of mild steel beams decreases with an increase in the spacing of the stiffeners. Therefore, it is important to provide an optimum spacing of the stiffeners to achieve the desired shear stress capacity of the stiffened web.
Stiffened webs are used in steel beams to increase their load-carrying capacity. The stiffeners are provided to prevent buckling of the web under shear stresses. The allowable shear stress in stiffened webs of mild steel beams decreases with an increase in the spacing of the stiffeners. This can be explained as follows:
Spacing of Stiffeners
The spacing of the stiffeners refers to the distance between two adjacent stiffeners. It is usually expressed in terms of the ratio of the spacing to the web depth. The spacing of the stiffeners has a significant effect on the shear stress capacity of the stiffened web.
Effect of Increased Spacing of Stiffeners
When the spacing of the stiffeners is increased, the shear stress capacity of the stiffened web decreases. This is because the buckling stress of the web is directly proportional to the spacing of the stiffeners. When the spacing is increased, the buckling stress decreases, which results in a decrease in the shear stress capacity of the web. The buckling stress depends on the ratio of the effective depth of the web to the spacing of the stiffeners.
Effect of Decreased Spacing of Stiffeners
On the other hand, when the spacing of the stiffeners is decreased, the buckling stress of the web increases, which results in an increase in the shear stress capacity of the web. This is because the stiffeners provide lateral support to the web, and when the spacing is decreased, the lateral support increases, which results in an increase in the buckling stress of the web.
Conclusion
In conclusion, the allowable shear stress in stiffened webs of mild steel beams decreases with an increase in the spacing of the stiffeners. Therefore, it is important to provide an optimum spacing of the stiffeners to achieve the desired shear stress capacity of the stiffened web.
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Community Answer
The allowable shear stress in stiffened webs of mild steel beams decr...
For unstiffened webs the permissible shear stress,Tva = 0.4 fy
For stiffened web:
(i) For webs where distance between vertical stiffeners (c) is less than 'd'
(ii) For webs where distance between vertical stiffeners (c) is more than 'd'
Thus, with increased spacing between vertical stiffeners,Tva decreases.
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The allowable shear stress in stiffened webs of mild steel beams decreases witha)decrease in the spacing of the stiffenersb)increase 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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