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Corten Steel Arches Bridging Tectonic Forces in Iceland's Dynamic Landscape

Author:
Wil Hershner
Corten Steel Arches Bridging Tectonic Forces in Iceland's Dynamic Landscape
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Weathering steel arches interact dynamically with shifting tectonic plates at Grjótagjá, creating a resilient structure that serves as a bridge between natural forces and human experience.
5 key facts about this project
01
Weathering steel structures adapt to the shifting landscape over time.
02
Pivot points in select arches allow for dynamic movement as tectonic forces interact.
03
Notched plates visually document the passage of time through wear and tear.
04
The design features a ribcage-like form, symbolizing strength and vulnerability.
05
Located at a unique tectonic divide, the project highlights geological phenomena.

The design at Grjótagjá caverns is located at the tectonic divide between the Eurasian and North American plates. The site features a landscape shaped by constant geological activity. The concept centers on the themes of creation and destruction, exploring how architecture can reflect the natural processes all around. The design utilizes modular arches that resemble a ribcage, representing both the strength and fragility of the structure as it spans the rift created by shifting tectonic forces.

Modular Arches

Each arch in the design adapts to its surroundings. The modularity allows for flexibility in response to the shifting landscape over time. These arches are not static; rather, they engage with the geological phenomena present at the site. This thoughtful integration highlights the resilience of the structure while also acknowledging the transformations that the landscape undergoes.

Dynamic Movement

Certain arches feature pivot points, facilitating movement as the chasm between the tectonic plates widens. This design choice supports the architecture's ability to adjust and maintain functionality in a changing environment. The interaction of these structural elements with the geological forces emphasizes the project’s focus on time and adaptability. As the earth shifts, the arches respond, underscoring the ongoing dialogue between built form and nature.

Materiality and Time

Weathering steel is used in the construction of the arches. This material is intentionally selected to illustrate themes of change and decay. Over time, the weathering steel oxidizes, creating a visual record of time on the structure. The choice of material reinforces the idea that the building is alive, engaging with its environment and reflecting the natural processes of erosion that occur in the landscape.

Notched Plates

Notched plates are also part of the arches. These notches serve as indicators of time and movement, marking how the structure evolves as it interacts with geological forces. Each notch captures a moment of transformation, adding to the visual narrative of the architecture. This design detail deepens the connection between the built environment and its surroundings, illustrating how architecture can be a witness to the changes in the landscape over time.

The overall design captures the interplay of movement and stillness, connecting form and function in a cohesive manner. The notched plates elegantly frame the architecture’s relationship with the shifting landscape, creating a structure that is both functional and responsive to its environment.

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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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Competition organisers

The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

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