An Exoskeleton Structural System is a building design approach where the primary load-bearing structural elements, such as columns, braces, and frames, are placed on the exterior of the building envelope rather than within its interior. This external skeleton resists both gravity and lateral loads, such as wind and seismic forces, allowing the interior to remain largely free of columns or shear walls. The system improves structural efficiency by maximizing the building’s moment arm and enables greater architectural flexibility and façade expression. It is commonly used in high-rise buildings to optimize floor space, enhance seismic performance, and create distinctive building forms.
The concept of exoskeleton structures in architecture draws inspiration from biological organisms where strength and support are derived from external skeletons. While some early examples of exposed frames existed in mid-20th century buildings, it was in the late 1990s and early 2000s that the architectural and structural potential of true exoskeletal systems began to be systematically explored.
Notable among early adopters was the design of the 30 St Mary Axe in London (The Gherkin), which introduced a visible diagrid system. Later, the development of complex geometries, high-strength materials, and advanced fabrication techniques enabled wider adoption of exoskeleton-based designs in tall buildings across Asia, the Middle East, and Europe.
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