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If wind and earthquake loads are considered then the permissible stress in steel structures are :
  • a)
    increased by 25%
  • b)
    decreased by 33.33%
  • c)
    increased by 20%
  • d)
    increased by 33.33%
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If wind and earthquake loads are considered then the permissible stre...
Increased by 33.33%
When the effect of wind or seismic load is taken into account, the permissible stress in steel are increased by 33.33% percent. For rivets, bolts, and tension rods, the permissible stresses are increased by 25 percent, when the effect of wind or seismic load is taken into account.
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If wind and earthquake loads are considered then the permissible stre...
Permissible Stress in Steel Structures with Wind and Earthquake Loads

In steel structures, the permissible stress is the maximum stress that a material can withstand without experiencing failure. The permissible stress is determined based on various factors, including the type of loading conditions applied to the structure.

When wind and earthquake loads are considered, the permissible stress in steel structures is increased by 33.33%. This means that the steel material is allowed to withstand a higher level of stress when subjected to these specific loading conditions.

Explanation:
The increase in permissible stress for steel structures when wind and earthquake loads are considered can be attributed to the following reasons:

1. Load Distribution: Wind and earthquake loads typically distribute the applied forces more evenly across the structure compared to other types of loads. This results in a more uniform stress distribution on the steel members, allowing them to carry higher loads without failure.

2. Dynamic Loading: Wind and earthquake loads are dynamic in nature, meaning they exert varying forces on the structure over time. Steel, being a ductile material, has the ability to absorb and dissipate energy under dynamic loading conditions. This increased energy absorption capacity allows for higher permissible stress values.

3. Design Considerations: The design of steel structures for wind and earthquake loads takes into account various factors, such as the structural configuration, material properties, and connection details. These design considerations ensure that the structure can safely withstand the applied loads, resulting in higher permissible stress values.

4. Code Provisions: Building codes and standards, such as the International Building Code (IBC), provide guidelines for designing structures to withstand wind and earthquake loads. These codes incorporate safety factors and design criteria that result in increased permissible stress values for steel structures under these specific loading conditions.

It is important to note that the increase in permissible stress for wind and earthquake loads is specific to these loading conditions and does not apply to other types of loads. The permissible stress for other types of loads, such as dead loads or live loads, may be different and will depend on the specific design criteria and safety factors considered.

In conclusion, the permissible stress in steel structures is increased by 33.33% when wind and earthquake loads are considered. This increase is due to factors such as load distribution, dynamic loading behavior, design considerations, and code provisions specific to these loading conditions.
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If wind and earthquake loads are considered then the permissible stress in steel structures are :a)increased by 25%b)decreased by 33.33%c)increased by 20%d)increased by 33.33%Correct answer is option 'D'. Can you explain this answer?
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