Modeling of a piled foundation in a Femap with NX Nastran

Cover Page


Relevance. The underground part of the building (foundation and soil) has a significant impact on its stress-strain state and behavior under the influence of operational loads. Therefore, the existing regulatory and technical documentation regulates the design of buildings (structures), taking into account the joint work of their aboveground and underground parts. In practice, such accounting becomes possible on the basis of a comprehensive engineering analysis of the building as a large mechanical system “building - foundation - soil”, which today can be carried out using the finite element method. In the case of pile foundations, the correctness of the result depends largely on the reasonable choice of the design model of the pile-soil subsystem. The article analyzes three design models of piles operating in an array of soil foundation. The first model is discrete. In it, the pile is modeled by bars and is based on elastic supports (Spring) with generalized stiffnesses. Second model - spatial, in which the pile and soil are typed in by volumetric elements (Solid). Third model - spatial-bar or combined, in which the bar pile is embedded in the mesh of the soil mass using a rigid substructure formed by bars of high rigidity. The aim of the work - to determine a rational calculation model of the “pile - soil” subsystem, which allows, on the one hand, to reduce the general order of the system of resolving equations, and, on the other hand, to maintain the accuracy of the assessment of the stress-strain state of the calculation model of “pile - soil” and the building as a whole. Materials and methods. The numerical results of the analysis of the pile foundation statics using the three “pile - soil” calculation models were performed in the CAE software package - the Femap with NX Nastran class, which implements the finite element method. Results. Comparative-numerical analysis of the stress-strain state of the “pile foundation - soil” subsystem made it possible to determine the advantages, disadvantages, and also the areas of rational use of bar, spatial combined calculation models. In the next articles, it is planned to consider the calculation of piles for vertical loads, as well as a comparative analysis of numerical results with experimental data (in the labo-ratory or in field conditions) for horizontal and vertical effects.

About the authors

Elvira R. Kuzhakhmetova

Immanuel Kant Baltic Federal University

Author for correspondence.
SPIN-code: 1949-1140
14 Aleksandra Nevskogo St. Kaliningrad. 236041. Russian Federation

postgraduate student, senior lecturer of the Department of Engineering Science and Technical Systems


  1. Kuzhakhmetova E.R. Stress-strain state cylinder-plate-cable-stayed roof buildings (structures) with various forms of external support contour. Structural Mechanics of Engineering Constructions and Buildings. 2020;16 (2):95–110. (In Russ.)
  2. Kuzhakhmetova E.R. Constructive solutions of cable location in cylinder-plate-cable-stayed roof of building (structures). Bulletin of BSTU named after V.G. Shukhov. 2019; (5):77–89. doi: 10.34031/article_5ce292ca24bc23.91006970. (In Russ.)
  3. Przemieniecki J.S. Matrix Structural Analysis of Substructures. AIAA Journal. 1963;1(1):138‒147. 10.2514/3.1483
  4. Meissner C.J. A Multiple Coupling Algorithm for the Stiffness Method of Structural Analysis. AIAA Journal. 1968;6(11):2184‒2185.
  5. Sapozhnikov A.I. Metody konturnyh i raschetnyh tochek v nelinejnyh raschetah svajnyh estakad, zagruzhennyh gorizontal'nymi nagruzkami [Methods of contour and design points in nonlinear calculations of pile racks loaded with horizontal loads]. Izvestiya vysshih uchebnyh zavedenij. Stroitel'stvo i arhitektura [News of higher educational institutions. Construction and architecture]. 1984;(5):29‒30. (In Russ.)
  6. Kuzhakhmetova E.R. Numerical design of frame buildings taking into account the generalized stiffness and load of soil and foundation (part 1). Bulletin of BSTU named after V.G. Shukhov. 2019;(12):4–36. doi: 10.34031/2071-7318-2019-4-12-34-46. (In Russ.)
  7. Trofimenkov Yu.G., Obodovskiy A.A. Svaynyye fundamenty dlya zhilykh i promyshlennykh zdaniy [Pile foundations for residential and industrial buildings]. Moscow: Stroyizdat Publ.; 1970. (In Russ).
  8. SP 24.13330.2011. Svaynyye fundamenty. Aktualizirovannaya redaktsiya SNiP 2.02.03-85 [Pile foundations. Updated edition of SNiP 2.02.03-85]. Moscow; 2011. (In Russ.)
  9. SP 50-102-2003. Proyektirovaniye i ustroystvo svaynykh fundamentov [Design and construction of pile foundations]. Moscow; 2004. (In Russ.)
  10. Sapozhnikov A.I., Solgalov Yu.V. Raschet svaj na gorizontal'nuyu nagruzku v nelinejno-deformiruemom osnovanii [Calculation of piles for horizontal load in a nonlinearly deformable foundation]. Osnovaniya, fundamenty i mekhanika gruntov [Soil Mechanics and Foundation Engineering]. 1980;(4):9–11.
  11. Sapozhnikov A.I., Abdurakhmanov A. Metodicheskie ukazaniya po raschetu odnoetazhnyh karkasnyh sel'skohozyajstvennyh zdanij na svayah-kolonnah [Methodical instructions for the calculation of one-story frame agricultural buildings on stilts-columns]. Kiev; 1979. (In Russ.)
  12. Sapozhnikov A.I., Shtanko L.F. Rukovodstvo po opredeleniyu gorizontal’noy seysmicheskoy nagruzki, deistvuyushchey na svaynyye pirsy I naberezhnyye [Guidance on the determination of horizontal seismic load acting on pile piers and embankments]. Moscow; 1974. P. 40–74. (In Russ.)
  13. Sapozhnikov A.I. Raschet zhestkih I korotkih svaj na prodol’no-poperechnye nagruzki [Calculation of hard and short piles for longitudinal-transverse loads]: methodical instructions. Astrakhan; 1994. (In Russ.)
  14. Sapozhnikov A.I. Kuzhakhmetova E.R. Sposoby pogruzheniya, prochnostnyye i deformatsionnyye raschoty svay [Immersion methods, strength and deformation calculations of piles]. 2015. Available from: (accessed: 04.04.2020). (In Russ.)
  15. Kuzhakhmetova E.R., Sapozhnikov A.I. Comparative analysis of long and short piles with horizontal uploading. Building materials, equipment, technologies of the XXI century. 2015;(5–6):30–34. (In Russ.)
  16. Kuzhakhmetova E.R. Dipping, calculation and construction of the monolithic reinforced concrete pile of the conical form. Scientific review. Technical sciences. 2017;(2): 57–64. (In Russ.)
  17. Rychkov S.P. Modelirovaniye konstruktsiy v srede Femap with NX Nastran [Structural modeling in Femap with NX Nastran]. Moscow: DMK Press; 2013. (In Russ.)
  18. Shimkovich D.G. Raschet konstruktsiy v MSC/ NASTRAN for Windows [Structural Analysis in MSC/NASTRAN for Windows]. Moscow: DMK Press; 2003. (In Russ.)
  19. Zienkiewich O.C. The finite element method in engineering science. Moscow: Mir Publ.; 1975. (In Russ.)
  20. GOST 19.804.1 Svai zabivnyye zhelezobetonnyye tsel'nyye sploshnogo kvadratnogo secheniya s nenapryagayemoy armaturoy i poperechnym armirovaniyem stvola i s napryagayemoy armaturoy [Reinforced concretedriver square piles. Structure and dimensions]. Moscow: Standartinform Publ.; 1980. (In Russ.)
  21. SP 63.13330.2011. Betonnyye i zhelezobetonnyye konstruktsii. Osnovnyye polozheniya. Aktualizirovannaya redaktsiya SNiP 52-01-2003 s izmeneniyem No. 1 [Concrete and reinforced concrete structures. Fundamental requirements. Updated edition of SNiP 52-01-2003 with amendment No. 1]. Moscow; 2015. (In Russ.)
  22. SP 22.13330.2011. Osnovaniya zdaniy i sooruzheniy. Aktualizirovannaya redaktsiya SNiP 2.02.01-83*. [Soil bases of buildings and structures. Updated edition of SNiP 2.02.01-83*]. Moscow; 2010. (In Russ.)



Abstract - 234

PDF (Russian) - 38




Copyright (c) 2020 Kuzhakhmetova E.R.

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies