How do fixed and pinned connections between piles and pile caps affect the load carrying capacity of piles?

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The type of connection between piles and pile caps affects the load carrying capacity of pile groups. The fixity of pile head into pile cap, instead of pinning into pile cap, enhances higher lateral stiffness of the pile groups. For instance, for the same deflections, a cap with fixed connected piles can sustain far more loads than that of pinned connected piles. To satisfy the criterion of fixed connection, the minimum embedded length of piles into pile caps should be at least two times the diameter of piles.

Moreover, the fixed connection of piles at pile caps allows significant bending moment to be transmitted through the connections when compared with pinned connections.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Comments
  • droaun June 17, 2012 at 11:43 pm

    what does it mean by embedded by 2 times diameter for fixed pile cap. say if pile diameter is 200mm, embed length would be 400mm. so how deep should the pile cap be?

    in general a depth of pile cap is = Ø pile * 3/2

  • bhola m. sontakke May 22, 2013 at 6:29 am

    i want some idea how to fix diameter of pile &how to fix the depth of pile
    please guide me or please send me data about pile foundation.

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