The structural framework of the building relies on three fundamental elements: an X-bracing system along the outer facade, the central staircase as a load-bearing component, and the core featuring reinforced concrete walls. The staircase, constructed from triangulated concrete surfaces, not only facilitates movement but also bears loads for the ceiling.

The X-bracing system on the outer facade operates as a large truss, enabling generous cantilevers at the two entrances without compromising the existing underground car park entrances. The supports of this system, comprising a reinforced concrete composite with a 40x40cm cross-section, are prefabricated, streamlining construction and minimizing on-site formwork work.

The floor slabs, spanning relatively long distances at 45cm thickness, forego traditional joists. This innovation is made possible through Bubble-Deck technology, a patented integration technique that links air, steel, and concrete in a two-way structural slab. Hollow plastic balls, held in place by reinforcing steel, replace non-structural concrete, maintaining biaxial strength. This approach can reduce up to 35% of structural concrete. When combined with the reduced floor thickness and facade, as well as smaller foundations and columns, this system has the potential to cut construction costs by as much as 10%. The structural ingenuity employed not only ensures efficiency in construction but also contributes to the overall sustainability of the building.

Efficient use of natural light was at the core of our energy strategy. We aimed to reduce reliance on artificial lighting by harnessing sunlight, introducing zenith light into the library through daylight transport systems equipped with shading mechanisms.

In the pursuit of sustainable temperature control, the perforated facade panels play a dual role. They diffuse direct sunlight to protect sensitive media elements and provide effective shading to prevent excessive heat buildup during the summer months.

Geothermal energy takes center stage in our heating and cooling approach. Groundwater heat pumps will be employed to generate a significant portion of the energy needed for climate control, contributing to a more eco-friendly energy profile.

Component activation adds another layer of efficiency to our strategy. Rather than relying solely on traditional heating methods, we'll integrate a water-carrying pipe system into the building components for surface heating, ensuring a balanced and comfortable room climate.

Ventilation is approached innovatively through the atrium and stair core, acting as a natural chimney for air circulation. Controllable air outlets in the facade facilitate the intake of fresh air, while ventilation openings in the atrium roof expel stale air. This design creates a ventilation loop through a chimney effect, minimizing the need for mechanical support and enhancing the overall sustainability of the building's energy systems.

Heidenheim Library (DE)

International Competition in Two Stages, 2nd Prize

Office: NAU (http://nau2.com/)

Details:

Heidenheim, a town in southern Germany, made a significant move in 2013 when NAU secured the second prize in an international competition organized by the City of Heidenheim. What made NAU's design noteworthy was its forward-thinking approach, surpassing the typical boundaries of architectural projects.

In contrast to the usual library and cafe setup, NAU aimed higher—a comprehensive cultural center. Their plan included not just a library but also a media center, versatile function rooms, and a city archive. The primary goal was to redefine Heidenheim, transforming it into a vibrant cultural hub to meet the diverse needs and interests of its residents.

The community responded positively to the concept, and I played a crucial role in turning it into reality. From conceptualizing ideas to designing and managing practical elements like layouts, 3D models, and diagrams, I was involved throughout the entire process.

What's impressive about NAU's design isn't just about constructing buildings; it's about reshaping Heidenheim into a more dynamic and culturally rich place. This endeavor wasn’t just design work; it was a collaborative effort to make Heidenheim a lively and culturally diverse community.

The fusion of the city’s library and media center in one new facility embodies the spirit of the information age by bringing together the range of contemporary media under one roof. It recasts the library not as a place where knowledge is simply stored, but primarily as a place of discovery and communication. Through its compact and efficient form placed at the north end of the site, the design energizes the urban character of the bustling Brenzstrasse to the north. Simultaneously this location opens the opportunity to create a new park to the south, connecting to the greenery around the Paulus church and extending a green axis all the way to the train station and Georges-Levillain Square.

The interior of the library revolves around a striking and well-lit stairway that seamlessly connects all levels. Beyond its role as a circulation route, this stairway serves as informal seating and integrates with the building's structural system, making it both the literal and metaphorical heart of the structure.

To achieve optimal interior lighting, the exterior of the design is enveloped in a woven aluminum skin. This innovative exterior not only diffuses light but also provides effective sun shading, endowing the building with a monumental presence. The undulating facade design facilitates the creation of outdoor terraces across various floors, contributing to the building's sculptural character.

The inspiration behind this woven design draws from Heidenheim's historical association with the weaving industry. Additionally, it reflects the town's contemporary production of high-tech paper products, employing intricate folding techniques. In essence, the design pays homage to Heidenheim's industrial heritage while embracing modern technologies, creating a seamless blend of the town's past and present in the architectural fabric of the library.