PLAXIS 2D Tutorial 08: Cyclic vertical capacity and stiffness of circular underwater footing

01 November 2019

This tutorial illustrates how to calculate the vertical bearing capacity and vertical stiffness of a circular stiff underwater footing (e.g. one of the footings of a jacket structure) exposed to cyclic loading during a storm. The storm is idealised by a distribution of load parcels with different magnitude. The cyclic accumulation tool is used to obtain soil parameters for the UDCAM-S model. The example considers a circular concrete footing with a radius of 11 m, placed on an over-consolidated clay layer.

UDCAM-S: Cyclic accumulation tookl: Stress-strain curves for total load


  • Obtain the UDCAM-S model input parameters by running the cyclic accumulation procedure, determining the stress-strain curves and optimising the material model parameters.
  • Calculate the total cyclic vertical bearing capacity.
  • Calculate the vertical stiffness accounting for cyclic loading for both the total and the cyclic component.
The attached *.p2dxlog file contains all the commands to generate the model. With a PLAXIS VIP licence, you can use the commands runner to open the *.p2dxlog file and to execute all commands in one go, see also this instruction.

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