REX Piles

REX Piles is an extension for Autodesk® Robot™ Structural Analysis that allows more effective analysis and design of structures partially or completely supported on piles. Thanks to quick and simple including of elastoplastic pile-soil interaction, a user can analyze structures supported on piles in a more precise and cost-effective way.

  • More accurate and reliable analysis of structures supported on plies.

Internal forces and displacements in the structure supported on piles significantly differs depending on whether the structure’s supports are defined as piles in the model or not. Thanks to this add-on, a user can better optimize a model of the structure supported on piles in Autodesk Robot Structural Analysis.

  • Optimization of further piles design.

More accurate results of internal forces in piles and piles displacements can be used in another software dedicated to an overall piles design. In result, further piles design is optimized and more cost effective.

  • Analysis of a wider range of options how the structure could be supported

Thanks to combination of features offered by REX Piles and Autodesk Robot Structural Analysis, a user can consider more alternative options how the structure could be supported taking into account a combination of several elements (piles, spread footings, continuous footings, foundation slabs, etc.) He has more comprehensive data to choose the best solution according to given requirements.

  • Cost estimation of piles

Having information about an approximate pile’s geometry (its length and diameter) and values of internal forces, a user can design its reinforcement just like for an RC column. Then he can use roughly calculated reinforcement and concrete volume for further cost estimation.


REX Piles lets a user account for pile-soil interaction by calculating the distribution of horizontal and vertical ground reaction moduli along the pile shaft and by specifying elastic characteristics of the pile base support. Distributions of ground reaction moduli are then changed to characteristics of supports and generated in Autodesk Robot Structural Analysis as a system of elastic supports distributed along the member axis.

After sending detailed data about elastic supports back to Autodesk Robot Structural Analysis, a user can generate a calculation model of a pile which accurately represents real work of the pile in the defined ground, then verify real structure displacements in foundations and optimize design of piles.

Key features

  • a wide range of pile types and pile manufacturing technologies
  • analysis of single piles and pile groups
  • definition of an arbitrary soil profile
  • graphic presentation of data and results
  • generation of calculation documentation
  • model and a soil profile saving
  • elastic supports definition in Autodesk Robot Structural Analysis
  • several language versions: English, French and Polish

Scope of Calculations

REX Piles is used to analyze the pile-soil interaction for different pile types with the shaft diameter from 0.2 to 1.8 m. Calculations are performed for a single pile or a group of piles, vertical or inclined (at an angle up to 45 degrees).

Definition of the pile parameters is based on geometrical data of a member selected in Autodesk Robot Structural Analysis: length, cross-section shape (circular, square, rectangular or composed) and cross-section dimensions (such as radius and side dimensions).

Afterwards, a user specifies parameters of the type and technology of pile manufacturing and defines layers of soil where the pile is situated. After the required parameters are defined, REX Piles calculates variability of the reaction moduli Kx(z) and Kt(z) along the pile shaft and the characteristics of the elastic support of the pile base Kp, Kb and Kr.

The pile-soil interaction is represented in the calculation model by a system of elastic supports distributed along the member axis and elastic supports of the pile base. Elastic supports perpendicular to the pile shaft (with the stiffness kx) express the soil reaction to lateral displacements of a pile, while tangent supports (with the stiffness kt) - the soil reaction to longitudinal displacements. The pile-soil interaction through the pile base (pressed piles) is represented by the elastic supports: axial (with the stiffness Kp), perpendicular to the axis (with the stiffness Kb) and rotational (with the stiffness Kr).

Finally, REX Piles sends information about a number, distribution and characteristics of elastic supports to Autodesk Robot Structural Analysis. As a result, a user obtains a calculation model of a pile which accurately represents real work of the pile in the ground.


European Funds – for development of innovative economy
Project co-financed by the European Union under the European Regional Development Fund


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