Gantry girders are designed to resist A. Lateral loads B. Longitudinal loads and vertical loads C. Lateral, longitudinal and vertical loads D. Lateral and longitudinal loads

The correct answer is: C. Lateral, longitudinal and vertical loads.

Gantry girders are designed to resist all three types of loads: lateral, longitudinal, and vertical. Lateral loads are loads that are applied perpendicular to the long axis of the girder. Longitudinal loads are loads that are applied parallel to the long axis of the girder. Vertical loads are loads that are applied downward, perpendicular to the ground.

Gantry girders are typically used in bridges and other structures that need to support a lot of weight. They are also used in cranes and other industrial equipment.

Here is a brief explanation of each option:

• Option A: Lateral loads. Lateral loads are loads that are applied perpendicular to the long axis of the girder. These loads can be caused by wind, earthquakes, or other forces. Gantry girders are designed to resist lateral loads by being strong in bending.
• Option B: Longitudinal loads. Longitudinal loads are loads that are applied parallel to the long axis of the girder. These loads can be caused by the weight of the structure that the girder is supporting or by the movement of the structure. Gantry girders are designed to resist longitudinal loads by being strong in tension and compression.
• Option C: Lateral, longitudinal and vertical loads. This is the correct answer. Gantry girders are designed to resist all three types of loads.
• Option D: Lateral and longitudinal loads. This is not the correct answer. Gantry girders are designed to resist all three types of loads, not just lateral and longitudinal loads.