How are the member elastic foundations entered? The question arises for a bored pile that is oriented in the global Z-direction and has different horizontal beddings in the global X- and Y-direction.

The parameters for entering the elastic member foundations are based on the coefficients of the surface foundations.

The coefficients always refer to the local member axes (x, y, z). The coefficients C1, x , C1, y and C1, z thus describe the displacement spring values in the direction of the local member axes (x, y, z).

The value Cφ expresses an obstacle to the rotation of the member about its longitudinal axis.

The values C2, x , C2, y and C2, z allow for consideration of the shear resistance of the soil in the direction of the local member axes (x, y, z).

The input always refers to a width of 1 m. If the member has a smaller width, you have to include it in the coefficients, for example: For example, for a member C1 with a width of 30 cm, z = 10000 kN/m³ x 0.3 m = 3000 kN/m².

To enter different horizontal foundations in the global X- and Y-direction, you should first consider the local axes of the member. Then you can enter the spring constants according to the directions.