Gantry girders can be designed

1. As laterally supported beams.

2. As laterally unsupported beams.

3. By using channel sections.

Select the correct answer using the codes given below:

Explanation

Gantry Girders: These are laterally unsupported beams provided in industrial buildings to carry cranes. It is designed by I-section. It can be designed as a laterally supported or laterally unsupported beam.

Types of section

a) ISWB: To resist more lateral Loads

b) Reinforced with Channel section

c) Box girder: For more torsional resistance

These are supposed to carry the following loads due to moving crane:

1) vertical loads or (gravity load)

2) lateral loads (produced due to jerk experienced while loading, unloading, and movement of the cranes)

3) longitudinal loads (produced due to longitudinal movement of the crane)