The computer program CGI-DFSAP provides direct assessment of the three-dimensional / rotational spring stiffnesses of an isolated short, intermediate or long pile/shaft or similar stiffness of a pile / shaft group with or without cap. Accordingly, the bridge engineer will be able to assess the various springs of the foundation stiffness matrix with disregard for the complexity of the soil profile, the type and arrangement of piles/shafts, and nonlinear material behaviour. Soil liquefaction and the associated induced pore water pressures are considered in the assessed foundation stiffness. Lateral spreading of the soil is an important phenomenon and is also handled by the CGI-DFSAP program. The CGI-DFSAP program is based on the well established concepts of the Strain Wedge model for laterally loaded piles/shafts and pile groups.

CGI-DFSAP also develop p-y curves (as output) that account for, 1) Pile Bending Stiffness (EI); 2) Pile Head Conditions (Free/Fixed); 3) Pile Cross-Section Shape (Square/Circular/H-Shape); 4) Pile-Head Embedment below Ground; 5) Soil Profile Continuity.

The current CGI-DFSAP computer program has the following capabilities and features:

  • Effect of vertical side shear resistance on the lateral response of piles and large diameter shafts

  • Analysis of pile group (mobilized group interaction) with no need for p-multipliers

  • Effect of full and limited soil liquefaction (water pressure) in the free- and near-field

  • Effect of lateral soil spreading on pile foundations

  • Lateral response of isolated piles and piles in a group that includes (lateral deflection, bending moment, shear force and soil-pile reaction)

  • Lateral resistance and displacement/rotational stiffnesses of a pile group with or without pile cap

  • Excess porewater pressure along the pile in liquefied soil

  • Effect of lateral soil spreading on the pile response

  • p-y curves at different points on the isolated pile

  • Pile load-transfer (t-z) curve for each soil layer along the pile length

  • Pile lateral, axial and rotational (spring) stiffnesses

  • Axial response of the pile (Load-settlement curve), and skin and tip axial resistance>

  • Moment-curvature relationship for the pile/shaft cross section(s)

  • Moment vs. pile bending stiffness (EI) relationship for the pile/shaft cross section(s)

  • Curvature vs. pile bending stiffness (EI) relationship for the pile/shaft cross section(s)

  • Linear and nonlinear modeling for pile/shaft materials.


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