Which of the following types of beams is used for lightly loaded beams such as roof purlins and sheeting rails?

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RRB JE CE 22 Apr 2025 Shift 2 CBT 2 Official Paper

Answer 1

Explanation:

Angle Sections:

Lightweight: Angle sections are often used for lightly loaded beams like roof purlins, making them cost-effective for smaller, less demanding structures.
Versatile: They can be used in various configurations, including horizontal, vertical, or sloped, providing flexibility in design.
Economical: Due to their shape and material efficiency, angle sections are cheaper compared to more complex beam designs, making them ideal for non-heavy duty applications.

Additional Information Castellated Beams:

Lightweight with High Strength: Castellated beams are designed with a web that is cut and rejoined, making them lighter while maintaining strength, ideal for longer spans.
Aesthetic Appeal: The design is often chosen for its aesthetic value, as it allows for architectural uniqueness in larger buildings or structures.
Not Ideal for Light Loads: Castellated beams are typically used for medium to heavy loads, making them unsuitable for lightly loaded applications like roof purlins.

Box Girders:

High Load-Bearing Capacity: Box girders are typically used for bridges or heavy-duty structures due to their ability to bear significant loads.
Complex Design: They are more complex in design and fabrication, making them costlier and less suited for light applications like roof purlins.
Durable: Box girders offer good resistance to torsional forces, making them suitable for situations where rotational forces are present, but not for lightly loaded beams.

Plate Girders:

Strong Load-Bearing Capacity: Plate girders are used for supporting large loads and are common in bridges, large buildings, and industrial structures.
Costly and Heavy: Due to their large size and the heavy material used in their construction, plate girders are more expensive and unsuitable for light-load applications.
Complex Fabrication: Plate girders require specialized fabrication, which makes them less efficient and practical for simpler structures like roof purlins and sheeting rails.