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GROUP

GROUP is a well-accepted tool for analyzing the behavior of pile groups subjected to both axial and lateral loadings. The program was developed to compute the distribution of loads (vertical, lateral, and overturning moment up to three orthogonal axes) applied from any multiple locations in the pile cap to piles arranged in a group.

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The program generates internally the nonlinear response of the soil, in the form of t-z and Q-w curves for axial loading, in the form of p-y curves for lateral loading and in the form of T-q curves for torsional loading. A solution requires iteration to accommodate the nonlinear response of each pile in the group model. Program GROUP solves the nonlinear response of each pile under combined loadings and assures compatibility of deformations and equilibrium of forces between the applied external loads and the reactions of each pile head.

Downloads

Demo Version
User’s Manual (PDF)

p-y Curves

Various built-in p-y curves including:

  • Clay

    • Soft Clay (Matlock)

    • Reese Stiff Clay with or without free-water

    • API Soft Clay With User-defined J.

    • Modified Stiff Clay without free-water.

    • Modified soft clay with initial K

  • Sand

    • Liquified sand (Rollins).

    • Reese Sand

    • API O'Neil Sand.

  • Silt (Cemented c-φ).

  • Reese Weak Rock.

  • Strong rock (Vuggy Limestone).

  • User-input p-y curves.

  • Elastic Subgrade.

Output

  • Individual pile bending moment, shear force, mobilized sectional properties, or curvature of piles under each load case, and more are outputted for each example.

  • Optionally print out a text file (response file) with equivalent nonlinear springs along the pile, which is useful for performance of complete soil-structure interaction analyses using other structural software.

  • p-y curves may be automatically generated by the program and printed for review. Points of internally generated p-y curves can be requested for output according to user-defined levels of deflections.

  • Export loading, pile group layout, or graphs directly to MS-Excel.

Pile Sections

User defined piles with circular, rectangular, and wide-flange sections, with option to include nonlinear flexural stiffness for standard reinforced concrete sections for complex composite sections with structural streel inserts

  • Elastic

    • Circular (hollow or full)

    • Rectangular

    • Custom widge flange

    • Predefined AISC sections from built-in library

    • User defined sectional properties

  • Nonlinear

    • Circular section with or without rebar reinforcements

    • Circular sections with casing

    • Circular steel tubes

    • Predefined AISC sections from built-in library

    • Prestressed square sections

    • Presstressed octagonal sections

    • User defined EI

Boundary Conditions

Specify conditions pile-cap connection as

  • Fixed

  • Pinned

  • Elastically restrained with a user-defined rotational spring stiffness

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