A dynamic structure is a seemingly fixed structure with compression support provided by the deflection of high speed streams of mass. There are many variants for space launch:
vertical, like the space fountain
circular, like Paul Birch's orbital rings
orbiting segment, like Roger Arnold's spaceport
ground anchored loop connected to circular segments, such as the launch loop
These ideas were all developed independently, most "negatively inspired" (that won't work but this might) by Arthur Clarke's science fiction novel "Fountains of Paradise", which was inspired by Yuri Arsutanov's "space railroad", which was inspired by Konstantin Tsiolkovski's "space tower".
Space Fountain by Rod Hyde et. al.