Steel Thickness for Members Not Exposed to Weather

Introduction:
In civil engineering, steel is commonly used as a structural material due to its high strength, durability, and versatility. The thickness of steel members is an important consideration to ensure structural integrity and safety. When steel members are not exposed to weather conditions, certain criteria need to be followed to determine the minimum thickness of the steel.

Factors to Consider:
When determining the thickness of steel members not exposed to weather, several factors should be taken into account:

1. Applied loads: The thickness of steel should be sufficient to resist the applied loads without experiencing excessive deflection or failure. The type and magnitude of the applied loads, such as dead loads, live loads, and environmental loads, should be considered in the design process.

2. Structural configuration: The overall structural configuration, including the shape and size of the steel members, influences the required thickness. Different structural elements, such as beams, columns, and plates, may have different thickness requirements based on their specific functions and load-bearing capacities.

3. Design codes and standards: Design codes and standards provide guidelines and requirements for the design of steel structures. These codes often specify minimum thickness requirements based on factors such as the material properties, loadings, and safety factors. Compliance with these codes ensures that the steel members meet the necessary design criteria.

Minimum Thickness Requirement:
Based on the information provided, the correct answer is option 'B' - 6 mm. This means that for steel members not exposed to weather, the minimum thickness should not be less than 6 mm.

The minimum thickness requirement of 6 mm ensures that the steel members have adequate strength and stiffness to resist the applied loads and maintain structural stability. It provides a safe margin against failure and excessive deflection, considering the specific design criteria and safety factors.

It is important to note that the minimum thickness requirement may vary depending on the specific design parameters, loadings, and design codes applicable to the project. Design calculations and structural analysis should be performed to determine the precise thickness requirement for each steel member based on the project's unique characteristics.

Conclusion:
In summary, when steel members are not exposed to weather, the minimum thickness should be determined based on factors such as applied loads, structural configuration, and compliance with design codes. The correct answer of 6 mm indicates the minimum thickness requirement for these specific conditions. However, it is essential to perform detailed design calculations and analysis to ensure that the steel members meet all necessary criteria for structural integrity and safety.