The Arc
  • Height : 16 mtr
  • Floor size : 720 sqm
  • Structural Typology : Arches and Gridshell
  • Location : Sibang, Bali, Indonesia
  • Client : Green School
  • Building : Gymnasium
Awards

The Arc is the newest building on campus at the world-renowned Green School in Bali, Indonesia. The school has a 12-year history of breaking boundaries and expanding horizons and the Arc is the newest benchmark in that history, raising the bar for sustainable education around the world.

The Green School is a promise to the kids of a bountiful future. We chose to build it out of bamboo because bamboo is beautiful, and because we can grow enough of it for everyone, and anything that we dream up and innovate can be built out of it
John Hardy, Green School co-founder

The first building of its kind ever made, The Arc is a feat of engineering, employing one of nature’s greatest strategies for creating large spaces with minimal structure. Within a human ribcage, a series of ribs working in compression is held in place by a tensioned flexible layer of muscle and skin. This creates a thin but strong encasement for the lungs. In the case of The Arc, a series of intersecting bamboo arches, reaching 14 meters tall and spanning 19 meters wide, are held in compression by a series of tensioned anticlastic gridshells, which derive their strength from curving in two opposite directions. These fields of gridshells appear to drape across the spaces between the impossibly thin arches soaring overhead, giving a whimsy, intimacy, and beauty to the space. Although the gridshells appear to hang from the arches, they actually hold them up.

The gridshells use shape stiffness to form the roof enclosure and provide buckling resistance to the parabolic arches. The two systems together create an unique and highly efficient structure, able to flex under load allowing the weight to redistribute, easing localized forces on the arches.
Neil Thomas (atelier.one)
Fifteen different rounds of structural tests were conducted for The Arc in the six months that led up to the final and conclusive Saddle Test. Failures were observed; improvements were considered. From our data, the building was engineered for adverse conditions including storms and earthquakes.
James Wolf, On-Site Consultant for engineering tests & construction strategy

Bamboo Pure collaborated with IBUKU and atelier.one to conduct extensive testing which resulted in a collection of fine-tuned, tailor-made construction details, keeping in mind the opportunities and limitations of bamboo construction.Bamboo Pure collaborated with IBUKU and atelier.one to conduct extensive testing which resulted in a collection of fine-tuned, tailor-made construction details, keeping in mind the opportunities and limitations of bamboo construction.

There is something quite wonderful about ancestral craftsmanship meeting modern construction techniques. Balinese artisans have worked with bamboo for centuries, but rarely around cranes! Following Balinese culture, buildings come to life piece by piece from the ground up, so raising horizontally prefabricated arches was unorthodox.
Jules De Laage, IBUKU On-Site Architect & PT Bamboo Pure Construction Manager

The result is a refined design with unparalleled beauty, which stands as a testament to Bamboo Pure’s commitment to providing creative construction solutions.

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