Posts tagged with "glass facade":
NBBJ designed a trio of connected glass orbs with living walls at the new Seattle headquarters for online retail giant Amazon. According to an announcement on Amazon’s blog, the spherical design—a project seven years in the making—was “chosen due to its natural occurrence in nature and as a nod to historic conservatories, like Kew Gardens.” This atypical meeting place away from the typical office towers provides a treehouse-like environment for employees, complete with terraces, water features, soaring staircases, and wooden decking.
The construction required more than 620 tons of steel supported by a burly concrete base to buttress the triangular insulated glass units fashioned from modularized Vitro glass. The open floor plan comprised three spherical units enveloped in Ultra-clear Vitro Starphire low-iron glass, which allows for higher visible light transmission, heightening views from multiple angles. “Iron is what makes glass appear green," said Andre Kenstowicz, Vitro Glass manager on the project. "Low iron Starphire glass eliminates the 'green' hue of traditional clear glass so the only green that you see is from the 300 species of tropical plants inside of the Amazon Spheres.” There are around 40,000 plants in the project.
Like all three domes, the largest is glazed by the contractor Enclos with Vitro’s Solarban Solar Control 60 Low-E coating in double laminate, measuring approximately 90 feet tall and 130 feet wide. All 2,643 panels of glass achieve 73 percent visible light transmittance and a solar heat gain coefficient of 0.40 across the visibly sinuous surface. This film beneath the surface limits the amount of radiation entering and consequently helps the interior to remain a stable, cool temperature.
NBBJ designed this biophilic environment to “inspire creativity and even improve brain function," according to the company’s blog. Luckily the public also has year-round access to the stimulating habitat at the base of the garden in the visitor center. There, in the thick of it, Seattleites can experience biodiversity in the heart of the city.
Structural Engineer: Magnusson Klemencic Associates
Glass Manufacturer: Vitro Architectural Glass, Northwestern Industries, Kuraray
Glass Fabricator: Northwestern Industries, Inc.
Glazing Contractor: Enclos
The glasshouses are comprised of 893 unique laminated glass panels framed by over 1.25 km of steel mullions.Designed by Heatherwick studio and situated on an industrial site of production since 900AD, Bombay Sapphire’s new distilling operations are distributed into a campus of 23 restored buildings, organized around a widened river and central courtyard. The BREEAM 'outstanding' rated project features two bulbous structures that seemingly float on the river, physically connecting Bombay’s distilling operations to their historic site. Eliot Postma, project leader at Heatherwick studio, cites Britain’s history of glasshouse structures as inspiration for the project: “Modernism has a tendency to flatten buildings, in contrast to the Victorian era’s obsession with three-dimensional shapes and curved domed forms, where a combination of glass and steel is omnipresent. We are quite interested in the dynamism that mullions and steel work might give to a glass facade.” A turning point in the design came with the discovery that excess heat was being produced by machinery through the distilling process. Postma and his team were able to capture this heat, pulling it into the new glasshouse buildings where it was used to grow Mediterranean and tropical plants used by Bombay Sapphire in their trademark gin recipe. Postma calls this an “environmental loop” which is formally represented through a linear reading of the steel mullions, flowing outward, through the still house before landing delicately on the river. Heatherwick studios worked with engineers and contractors to design a self-supporting structural system comprised of laminated glass panels clamped to a rolled steel frame. The geometry of the building envelope was continually refined into the construction phase, ultimately arriving at a solution that balanced material properties with structural requirements. One major problem the design team encountered early in the project was formal gesture of a glass dome introduced highly complex doubly curved surfaces. This became a major constructional problem the design team focused on throughout the development of the project, lasting into the construction phase. Through iterative design models, the team was able to enhance the structural performance of the envelope by pleating the dome form. Additionally, the team optimized their design to work within a specific method of laminated glass panel manufacturing, requiring each panel to be rationalized into a singly curved surface. The assembly process began by erecting a patchwork of steel framework and temporary cross bracing from the ground up. Upon completion of the steel structure, the cross-bracing members were removed one by one as the custom glass inserts were installed. The spirit of this project - its integral connection to the land – is evident in Heatherwick’s upcoming planned projects. On the outcomes of this project, Postma concludes, “This is one of the more complex glass structures that has been constructed. The studio is very interested in how glass can be used as an expressive material in its own right, as a way of creating form out of glass. There is a legacy of these glass houses in our studio today. Seeing the potential of curving glass and its limits and how that can be done reasonably cost effectively to really create quite elaborate form is something that we’ll continue to do as the studio progresses.”