Investigation on Effect of Water Depth into Dynamics Behavior of Fixed Offshore Platforms Equipped With Shape Memory Alloy Elements

In this research، the response of fixed offshore platforms equipped with shape memory alloy elements at the different depths under extreme wave loading are taken into account. For this purpose platforms located in different water depths 70، 110 and 150 has been considered. At first for evaluation of the nonlinear behavior of three platforms، pushover analysis using SACS has been engaged. Then nonlinear time history analysis under storm environmental condition using ANSYS finite element program has been performed on platforms situated in each water depths for two cases of with and without SMA. Based on results of this study، platform located in 70 meter water depth under storm wave has linear behavior and use of SMA doesn’t have any effect on it، while with equipped SMAs on 110 and 150 meters water depth platforms، SMA can be used such as a damper in structure because they have re-centering and energy dissipation capabilities. Applying the SMA damper in the jacket bracing، topside displacement and energy dissipation is controllable via mechanical properties of SMA selected by designer judgment as well re-centering capability of related damper prevents to generate residual strain in structure joint cans and members.