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123456789_123456789_1123456789Wind Turbine Gravity Base Foundation

Analysis model
ICDAS WTF 2017.00R

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WTF Model Examples

Model description


Geometry model

Analysis model

Landscape model

ICDAS Basis of Design


Additional features

Rendering & Animation 

Trial Version

Case Study 



































































Loads on full model


Detailed knowledge of loads must be available for

definition and assignment on LUSAS FEM model.

They are:  


- Wind load (velocity and direction)

- Wave load (height and period)

- Water level

- Flow load (velocity and direction) 

The external loads can be simplified to single concentrated

actions on the foundation as show to the right. It yields the

following considerations, cf. [2]


§       Vertical, shear forces and significant overturning moments

       are transmitted to foundation by tower

§       Must be resisted within tolerances for foundation settlement

       and tilt

§       Manufacturers typically specify horizontal and rotational

       foundation stiffness criteria

§       Loading direction changes with wind direction and nacelle


§       Circular foundation shape is therefore optimal, but

       straight-sided (e.g. octagonal, hexagonal) is easier to


§       Anchors can be used to add rotational strength

Analysis of the results

List of task for full static documentation is outlined in 

ICDAS Basis 

of Design

. In short, they are:


- Phases analyse using LUSAS 15.2-3 new features

- Stresses in two directions in concrete cylindrical shaft element


- Verification of reinforcement and concrete thickness in SLS and

  ULS after Eurocode

- Natural mode shapes and frequencies

- Wave-induced seabed response around the foundation

Additional dynamic analysis


- Natural mode shapes and frequencies of the wind turbine

   (including the foundation and the tower) depended on the

   selected type of foundation and the assumed properties of

   the subsoil.


- Passive/Active damper installation on top of the turbine tower

  related to the lowest natural mode shapes of the entire model.



FigureLoads on wind turbine and gravity base foundation,
Source [1]

FigureLoads on gravity base foundation,
Source [2]



[1] Concepts of gravity base foundations, Univ.-Prof. Dr.-Ing Steffen Marx, Institute of Concrete Construction, Leibniz University Hannover.

[2] Foundation for Wind Turbines, ENGR 340 - Fall 2011, Prof. Vern Schaefer & Jeramy C, Ashlock, Iowa State University CCEE Dept.

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Updated 05-09-2016

123456789_123456789_1123456789ICDAS  •  Hans Erik Nielsens Vej 3  •  DK-3650 Ølstykke  •   E-mail: th@icdas.dk   •  Tel.: +45 29 90 92 96  •  CVR no.: 34436169