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RAM | STAAD | ADINA Wiki Difference between Y and Y-ONLY type foundation support
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    Difference between Y and Y-ONLY type foundation support

       
      Applies To 
       
      Product(s): STAAD.Pro
      Version(s): All
      Environment:  N/A
      Area:  Modeling Solutions
      Subarea:  Supports
      Original Author: Bentley Technical Support Group
       

    When using the foundation support, I am required to give the subgrade modulus and supply a direction. I have always used Y as the direction. However, I am interested in knowing what would occur if I choose Y-only. Is there some type of weak spring placed in X & Z directions, is it completely restrained, or is it somewhere in between?

    If X or Y or Z is specified for direction, then,

    a) a spring support is generated in that direction 
    b) the other two translational directions are fully restrained
    c) the associated rotational degre of freedom is fully restrained
    d) the other 2 rotational degrees of freedom are treated as unrestrained

    Example :

    plate-list PLATE MAT DIR Y SUBGRADE 0.4

    FX is fixed
    FY gets a spring
    FZ is fixed
    MX is free
    MY is fixed
    MZ is free

    If XONLY or YONLY or ZONLY is specified, then, a spring support is generated in that direction. All the remaining 5 degrees of freedom are treated as unrestrained.

    Example :

    plate-list PLATE MAT DIR YONLY SUBGRADE 0.4

    FX is free
    FY gets a spring
    FZ is free
    MX is free
    MY is free
    MZ is free

    • subgrade modulus
    • Supply a Direction
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    • Steve Crabtree Created by Steve Crabtree
    • When: Tue, Jun 21 2016 5:09 PM
    • Modestas Last revision by Bentley Colleague Modestas
    • When: Fri, May 5 2023 6:51 AM
    • Revisions: 5
    • Comments: 0
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