Tube In Tube Structure

Also know as hull and core

  • Has a real core
  • Majority of the gravity and lateral loads through outer tube
  • Concrete shear walls for bracing.

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Also known as hull and core, these structures have a core tube inside the structure, holding the elevator and other services, and another tube around the exterior. The majority of the gravity and lateral loads are normally taken by the outer tube because of its greater strength. 780 Third Avenue, a 50-story concrete frame office building in Manhattan, uses concrete shear walls for bracing and an off-center core to allow column-free interiors.