Wave theory effects on behaviour of a 3D truss offshore structure

Abstract

Wave theory effects on behaviour of a 3D truss offshore structure Dynamic analysis of a four legged offshore truss structure under the effect of wave forces is conducted in this study. The structure is a three-storey space frame system formed of cylindrical members whose legs are supported by lateral bracings and vertical diagonals. The structure and its environment are numerically modelled by the finite elements method with the fluid-structure interaction. Due to climatic reasons, various wave theories may be applied to the structure. Therefore, the offshore environment is modelled in numerical analysis by the Linear, Stokes 2, and Stokes 5 wave theories, separately. Utjecaji teorije valova na ponašanje izvanobalne prostorne rešetkaste konstrukcije U radu je provedena dinamička analiza izvanobalne rešetkaste konstrukcije s četiri pojasa pod utjecajem sila valova. Konstrukcija je prostorni rešetkasti sustav s tri etaže formirana od cilindričnih elemenata, a čiji su pojasi osigurani uzdužnim spregovima s vertikalnim dijagonalama. Konstrukcija i njezin okoliš su numerički modelirani metodom konačnih elemenata uz interakciju fluida i konstrukcije. Zbog klimatskih razloga, konstrukcija može biti izložena različitim teorijama valova, pa je izvanobalni okoliš modeliran pomoću zasebnih teorija valova i to linearne, Stokes 2 i Stokes 5 teorije.