A floatable frame structure has concatenated frame modules, each formed of columns arranged substantially vertically. Neighboring columns are interconnected by upper and lower tie bars and form module sections. The connections between the tie bars and columns have rotary joints arranged at upper and lower nodes on the columns. At least one horizontal rotation joint is arranged for each column in the connection to an associated tie bar, and at least one spherical rotary joint or elastic rotary joint is arranged for each tie bar. Each module section is provided with elastic tensile elements secured to diagonally opposite upper and lower nodes, nodes lying diagonally opposite each other in the same horizontal plane and in the same frame module being connected by elastic tensile elements. Some columns form containers with submersible portions with positive buoyancy, and adjacent frame modules sharing at least one column.