Calcul des efforts de la houle sur une structure semi-immergée comparaison avec des essais sur maquettes

¹ Ingénieur Ecole Navale et E.I.H. Grenoble, Services d'Etudes Maritimes, SOGREAH.
² Ancien élève de l'Ecole Polytechniques, Département scientifiques, SOGREAH.

Résumé

The development of offshore drilling has brought with it a demand for increasingly large floating rigs. One of the main problems in building such large rigs is how to reduce wave forces and the motion they cause to a minimum. The object of the investigation described was to test an overall mathematical model designed to calculate these wave forces, considering their application to a simple submerged horizontal element with vertical columns emerging above water. A description of the mathematical model was given at the Symposium on research on wave action held in Delft in March 1969(see Proceedings). The calculated results were compared with vertical forces measured on a wave flume model, which showed that the mathematical model accurately rendered wave/force transfer function variations with changing wave period. Some discrepancies occurred in the short period range, but it is hoped to clear these by closer consideration of the free surface. An overall mathematical model based on simple formulation and a few preliminary model tests also gave very satisfactory results in this connection. Thus, a whole range of research facilities are now available for the various design stages for this type of structure, by means of which both local and overall wave forces and motion can be determined.