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The allowable shear stress in the web of mild steel beams decreases with (where ‘h’ is height and t is thickness)
- a)decrease in h/t ratio
- b)increase in h/t ratio
- c)decrease in thickness
- d)increase in height
Correct answer is option 'B'. Can you explain this answer?
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The allowable shear stress in the web of mild steel beams decreases wi...
"web" refers to the vertical portion of the beam):
1. Increase in the length of the beam: As the length of the beam increases, the shear force acting on the web also increases. This leads to an increase in the bending moment, which in turn increases the shear stress in the web. Therefore, the allowable shear stress decreases with an increase in the length of the beam.
2. Increase in the applied load: When the applied load on the beam increases, the shear force acting on the web also increases. This leads to an increase in the bending moment and subsequently increases the shear stress in the web. Consequently, the allowable shear stress decreases with an increase in the applied load.
3. Decrease in the depth of the beam: The depth of the beam affects its resistance to bending. A decrease in the depth of the beam results in a decrease in the moment of inertia, which leads to an increase in the bending moment and shear stress in the web. As a result, the allowable shear stress decreases with a decrease in the depth of the beam.
4. Increase in the thickness of the web: The thickness of the web affects its ability to resist shear stress. An increase in the thickness of the web leads to a decrease in the shear stress. Therefore, the allowable shear stress increases with an increase in the thickness of the web.
5. Change in the material properties: If the mild steel material used for the beam has different properties, such as a lower yield strength or ultimate strength, the allowable shear stress would decrease. Different grades of mild steel have different mechanical properties, and using a lower grade steel would result in a lower allowable shear stress.
1. Increase in the length of the beam: As the length of the beam increases, the shear force acting on the web also increases. This leads to an increase in the bending moment, which in turn increases the shear stress in the web. Therefore, the allowable shear stress decreases with an increase in the length of the beam.
2. Increase in the applied load: When the applied load on the beam increases, the shear force acting on the web also increases. This leads to an increase in the bending moment and subsequently increases the shear stress in the web. Consequently, the allowable shear stress decreases with an increase in the applied load.
3. Decrease in the depth of the beam: The depth of the beam affects its resistance to bending. A decrease in the depth of the beam results in a decrease in the moment of inertia, which leads to an increase in the bending moment and shear stress in the web. As a result, the allowable shear stress decreases with a decrease in the depth of the beam.
4. Increase in the thickness of the web: The thickness of the web affects its ability to resist shear stress. An increase in the thickness of the web leads to a decrease in the shear stress. Therefore, the allowable shear stress increases with an increase in the thickness of the web.
5. Change in the material properties: If the mild steel material used for the beam has different properties, such as a lower yield strength or ultimate strength, the allowable shear stress would decrease. Different grades of mild steel have different mechanical properties, and using a lower grade steel would result in a lower allowable shear stress.
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The allowable shear stress in the web of mild steel beams decreases wi...
The allowable shear stress in the web of mild steel beams decreases with) increasing beam depth. This is because as the beam depth increases, the web becomes thinner, resulting in a decrease in the cross-sectional area available to resist shear forces. This reduction in cross-sectional area leads to a decrease in the ability of the web to resist shear stress, and therefore, a decrease in the allowable shear stress.
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The allowable shear stress in the web of mild steel beams decreases with (where ‘h’ is height and t is thickness)a)decrease in h/t ratiob)increase in h/t ratioc)decrease in thicknessd)increase in heightCorrect answer is option 'B'. Can you explain this answer?
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