Floating offshore structure and floating offshore power generation apparatus having same

A floating offshore structure comprising:

• a plurality of columns;
• and
• a plurality of pontoons installed on lower ends of the columns,
• wherein a polygonal shape is formed by a virtual line connecting the columns,
• the pontoons are installed inside the polygonal shape,
• the columns include a first column, a second column, and a third column, and
• a cross-sectional area of the first column parallel to a sea level is greater than a cross-sectional area of each of the second and third columns parallel to the sea level,
• wherein the pontoons are installed on inner side surfaces of the polygonal shape of the columns,
• each of the pontoons has a hollow formed in a direction perpendicular to the sea level, and
• a porous damper is installed in the hollow, and
• wherein the porous damper includes a first porous plate, a second porous plate, and a third porous plate each having a plurality of through holes, and
• the through holes of the first and second porous plates do not overlap each other, and the through holes of the first and third porous plates overlap each other in a plan view.