Wind turbines are designed and analyzed using simulation tools capable of predicting the coupled dynamic loads and responses of the system. In this paper, an overview of the capabilities of a Computer-Aided Engineering (CAE) tool called FAST or Fatigue, Aerodynamic, Structures, and Turbulence in modeling wind turbines in different depths of water will be presented. Different offshore wind turbine support systems structures will be discussed. These support systems are classified into three categories according to the water depth, namely, shallow water, translational water and deep water depths. This paper will be focusing on the support structures used in translational and deep water depths only. This will also be focusing on incorporating hydrodynamic loading for multimember structures using FAST through its hydrodynamic loading module, Hydrodyn. Also, a quantitative comparison of th*e responses of different floating platforms will be tackled.

Sewage Pipe Renewal (SPR) method rehabilitate pipeline by forming a PVC profile inside the pipe by using a winding machine without excavating the soil above the pipe which lowers the cost of the rehabilitation. This study will investigate the effects of varying the pipe’s diameter to its wall thickness ratio. The dimensions for the diameter and minimum wall thickness of the non-reinforced concrete pipe will be based from ASTM C14. The finite element analysis software, ABAQUS, will be used to model and perform the analysis for the composite pipes. To account for the soil-pipe interaction, soil springs will be used as the bedding support to hold the pipe in place. Additionally, three soil types will be used to compare the behavior of the pipe with different diameter to thickness ratios. The results from the finite element analysis will be shown in tables and plotted into graphs and a concluding remarks will be provided.