Maximum Permissible Horizontal and Vertical Deflection in Steel Structure

The maximum permissible horizontal and vertical deflection in a steel structure is determined based on various factors such as the span length, the type of structure, and the intended use of the structure. The deflection limit is usually specified to ensure the structural integrity and stability of the building or structure.

Explanation:
The correct answer to the given question is option 'B', which states that the maximum permissible deflection in a steel structure is Span/325.

Reasoning:
The deflection limit in a steel structure is typically expressed as a fraction of the span length. This is because longer spans have a higher tendency to deform under load, and therefore, stricter deflection limits are imposed to ensure the safety and functionality of the structure.

The most commonly used deflection limit for steel structures is Span/325. This means that the maximum deflection allowed is equal to the span length divided by 325. The span length refers to the distance between the supports or the length of the beam or structure.

For example, if the span length of a steel beam is 10 meters, the maximum permissible deflection would be 10/325 = 0.0308 meters or 30.8 mm. This means that the beam can deflect up to 30.8 mm horizontally or vertically without compromising its structural integrity.

This deflection limit ensures that the structure remains stable and does not experience excessive movement or deformation, which could lead to failure or compromise the safety of the building. It also helps to control vibrations and ensure the comfort of occupants within the structure.

It is important to note that the deflection limit may vary depending on the specific design requirements and codes followed in different regions or countries. Therefore, it is essential to consult local building codes and regulations to determine the appropriate deflection limit for a particular steel structure.