Several very large ocean structures have been proposed as part of the Office of Naval Research feasibility study of a Mobile Offshore Base (MOB). The MOB platform nominally is about 1500m (lmile) by 129m (400ft), which is unprecedented in size and operations compared to any floating structure to date. The objective of this study was to provide a risk-informedconstruction feasibility assessment for five proposed MOB concepts and quantify their construction cost and schedule. The risk associated with cost and schedule were established by comparing resource requirements to build a MOB with the US industrial capacity. These risks were then modeled and simulated using commercial simulation software to provide cost and schedule estimates that accounted for uncertainty and risks. A decision analysis process is demonstrated that allows a decisionmaker to minimize identified risks. As a risk communication tool constructability guidelines particular to the construction of such a large structure have been developed as a useful tool for future designers and builders of a MOB. The guidelines are developed within the framework of risk management and specific applications are applied to general conditions, design for production, construction, and special topics in construction management that control or reduce construction risk. The scope of this study was limited to the construction of the hull.
Aself powered military platform called a Mobile Offshore Base (MOB) has been proposed by the US Navy for long term deployments and force projection. The MOB is a revolutionary structure due to its extremely large size and unique functions, thus building such a platform is a high risk venture. The objective of this study is to assess the construction feasibility of a MOB by applying risk analysis techniques to obtain optimum costs and schedules for the following five proposed MOB concepts:
