Assumption for rough hydrodynamic load estimation
1. We consider only the horizontal components of hydrodynamic loads
2. the time variation of the load and the dynamic response of the structure is not taken into consideration
3. We consider only the time moment that generates the maximum horizontal load and/or the maximum overturning moment
4. We assume 100-year wave plus (100 year) current.
5.  The phase differences due to horizontal spatial separation is neglected
6. The spatially distributed horizontal load on individual members is replaced by a number of horizontal point loads at the nodes of the space frame
Fh=ΣFhi    Moh=ΣhiFhi
7. The structure is represented by a collection of vertical members or by just one vertical member (equivalent stick model) FdD