Pile Cap Design Excel Sheet

It usually forms part of the foundation of a building, typically a multi-story building, structure or support base for heavy equipment. The cast concrete pile cap distributes the load of the building into the piles. 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.

  • As per IS 2911 (Part I/ Sec 3) -2010, the pile cap may be designed by assuming
  • that the load from column is dispersed at 45° from the top of the cap up to the mid
  • depth of the pile cap from the base of the column or pedestal. The reaction from
  • piles may also be taken to be distributed at 45° from the edge of the pile, up to the
  • mid depth of the pile cap. On this basis the maximum bending moment and shear
  • forces should be worked out at critical sections.

ASSUMPTIONS INVOLVED

  • (i) Pile cap is perfectly rigid.
  • (ii) Pile heads are hinged to the pile cap and hence no bending moment is
  • transmitted to piles from pile caps.
  • (iii) Since the piles are short and elastic columns, the deformations and stress distribution are planer.

DESIGN PARAMETERS


  • (i) Shape of pile cap.
  • (ii) Depth of pile cap.
  • (iii) Amount of steel to be provided.
  • (iv) Arrangement of reinforcement.

DESIGN PROCEDURE

  • DETERMINE NUMBER OF PILE
  • PILE CAP ARRANGEMENT AND PLANE DIMENSION
  • PILE CAP PRELIMINARY DEPTH
  • CHECK FORCES IN PILES
  • CHECK FOR PUNCHING SHEAR
  • CHECK FOR SHEAR
  • DESIGN OF MOMENT
  • CHECK FOR BOND
  • DETAILS FOR REINFORCEMENT

 

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