This document discusses different lateral load resisting systems and structural designs for tall buildings. It describes framed tube systems which make the entire building act as a hollow tube to maximize strength and stiffness. Bundled tube systems involve several interconnected tubes to resist loads. Tube in tube systems have a core tube inside holding services and an exterior tube that takes gravity and lateral loads. Diagonal bracing systems stabilize structures and distribute load effects. Core and outrigger systems transfer moments from the core to perimeter columns. Examples mentioned include 30 St. Mary Axe (The Gherkin) and Burj Khalifa.