How do you calculate pile cap size?

Worked Example: Design of Pile Cap consider 150mm offset from the pile and space between piles as 2.5 times pile diameter. Effective depth, d = 1000-50-20/2 = 940 mm > 750mm; (2.5×600/2) Ok. The critical section of the pile shall be considered as 20% of the diameter of the pile inside of the face of the pile.

What should be the depth of pile cap?

The overall depth of pile cap shall also be selected such that the effective depth of bottom reinforcement is at least 12 inches. Consider a uniform distribution of column load to the provided piles.

Is pile cap required for single pile?

IMHO, it is not needed because the transfer of load from column to pile is basically a direct transfer with pilecap being a mere intermediary. IMHO, for a single pile pilecap, the size is fixed based on pile size and column size (6″ on all sides from pile and 2″ on all sides from column – whichever is more critical).

How do you calculate the number of piles?

Both the dynamic and static formulas indicate that an allowable load of 15 tons per pile is reason- able. The number of piles required to support the load is 180/15 = 12 piles.

How do pile caps work?

Pile caps are constructed by excavating an area around the group of piles to enable formwork to be inserted. The pile tops may be trimmed to ensure they are at the same height. A reinforcement cage is then built and positioned in the formwork cast box and fastened to the piles.

Is a pile cap a footing?

It usually forms part of the deep foundation of a building, typically a multi-story building, structure or support base for heavy equipment, or of a bridge. A similar structure to a pile cap is a “raft”, which is a concrete foundation floor resting directly onto soft soil which may be liable to subsidence.

How do you calculate moment in pile cap?

The calculation of the moment at the face of column is as follows: Thus, the program uses the factored pile forces multiplied by their horizontal distance to the face of column and subtracts the self-weight of the pile cap and overburden in this area multiplied by its moment arm.

Why are pile caps used?

Pile caps create a stable foundation and offer a larger area for the distribution of the building load onto the piles. They act in a similar way to piled raft foundations, where a concrete slab rests on soil which may be susceptible to movement, above a group of piles. Rectangular (for all other number of piles).