A grillage foundation A. Is provided for heavily loaded isolated columns B. Is treated as spread foundation C. Consists of two sets of perpendicularly placed steel beams D. All the above

Is provided for heavily loaded isolated columns
Is treated as spread foundation
Consists of two sets of perpendicularly placed steel beams
All the above

The correct answer is D. All of the above.

A grillage foundation is a type of foundation that is used to support heavily loaded isolated columns. It is made up of two or more layers of steel beams that are placed perpendicular to each other. The beams are then connected by cross-bracing, which helps to distribute the load evenly. Grillage foundations are often used in areas with poor soil conditions, as they provide a more stable base for the column than a traditional footing.

Here is a brief explanation of each option:

  • Option A: Grillage foundations are provided for heavily loaded isolated columns. This is because they are able to distribute the load of the column more evenly than a traditional footing. This is important in areas with poor soil conditions, as it helps to prevent the column from sinking into the ground.
  • Option B: Grillage foundations are treated as spread foundations. This is because they spread the load of the column over a larger area of soil. This helps to reduce the pressure on the soil and prevents it from sinking.
  • Option C: Grillage foundations consist of two sets of perpendicularly placed steel beams. This is because this configuration provides the most strength and stability. The beams are then connected by cross-bracing, which helps to distribute the load evenly.

I hope this helps!