DuPont: Structural properties of SentryGlas® Plus make glass façade thinner and lighter

The ‘Cologne Triangle’ by architects Gatermann + Schossig is a striking yet slender 103 m- (338 ft)-tall office
tower wrapped in glass that seems to defy traditional laws of aerodynamics and transparency. The tower’s south façade, which is subject to particularly demanding wind load and solar requirements, is double glazed to incorporate laminated glass with DuPont™ SentryGlas® Plus structural interlayer.
Josef Failer of glass laminator Flachglas Wernberg said: “The south façade of the Cologne Triangle owes its great transparency and feeling of lightness, combined with outstanding post-breakage strength, to an entirely new pointfixed glazing system incorporating 2,500 m2 (26,910 ft2) of laminated glass with SentryGlas® Plus, which looks almost ‘frameless’ to the eye. “Using this new-generation architectural laminated glass construction with SentryGlas® Plus interlayer (Flachglas Wernberg has trademarked its new
laminated glass product SiglaPlus®), we have successfully met the structural strength requirements of the architects, the engineers and the local building authorities - including stringent requirements for wind load performance - with a solution that is about 20 percent thinner than traditional laminated glass.
“The outstanding post-breakage performance of SentryGlas® Plus structural interlayer is key to the success of the laminated glass in The Cologne Triangle’s south façade In addition to its rigidity, DuPont’s structural interlayer also contributes to the transparency of the façade because of its excellent edge stability, which means no delamination and no discoloration.”
The glazing consists of 6 mm (0.2 in) fully-tempered Pilkington Optiwhite® glass + 1.52 mm (0.060 mil) SentryGlas® Plus + 8 mm (0.3 in) fullytempered Optiwhite® glass.
Gatermann + Schossig principal, Professor Doerthe Gatermann, said: “The tower takes the form of a triangle with three curved sides. Our concept was to create a contemporary building for the city of Cologne. The city authorities love the very modern form of an ethereal glass tower, and they hope that it will become a new Cologne landmark.” She continued: “The Cologne Triangle’s unusual glass form means that city dwellers and visitors alike still have uninterrupted views of our city’s majestic cathedral, which lies just across the river; it has also enabled us to create an office tower that is highly energy efficient. The glass façades use the sun’s energy to help heat the building in winter.
“As well as providing significant structural strength to the glass façade and helping the Cologne Triangle to obtain planning permission in the face of demanding wind load requirements, the laminated glass with SentryGlas® Plus used in the south façade is intrinsically clear; people inside the office building also benefit from remarkable views over the cathedral and the city.”
This is one of the first installations of a laminated glass façade with SentryGlas® Plus on a new building in Germany - and in Europe. In 2004, Flachglas also used a two-sided supported façade using SentryGlas® Plus for the 5,000 m2 (53,820 ft2) refit of a corporate headquarters in Hamburg, working with façade engineer Strabag AG.

Leave a Reply

You must be logged in to post a comment.