This research aims to examine the application of Steel-Concrete-Steel sandwich composite structure in Arctic platform construction by examining the feasibility of the composite structure in terms of materials, structural form, fabrication, transportation and field installation. A composite cone is made up of an outer steel cone, a concrete infill, and an inner steel cone, with shear connectors on the inner faces of the steel cones. The construction sequence is to build the steel cones empty of concrete, to launch and tow the structure to site, and then to ballast it to the seabed and fill the cones with concrete. This paper also presents the latest research breakthrough of ultra-lightweight high strength cement composite for marine and offshore application. The use of this new material enables novel Steel-Concrete-Steel sandwich composite structures to be developed with lower self-weight, which will provide an alternative Arctic platform construction. Novel shear connectors have been developed to improve the composite action between the steel face plate and the concrete.
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