STRUCTURAL GLASS SANDWICH PANELS
To provide stiffness, shading and privacy with daylight and a feeling of openness for restaurant extensions and an entrance canopy to a London hotel, we used glass sandwich panels with aluminium honeycomb core. Similar construction had been used on smaller scale for interior decorative panels and for some interior floor panels. Exterior glass sandwich panels need durable strength and stiffness with continuing clarity, so we developed a detailed set of tests and acceptance criteria for all aspects of the appearance and performance of the panels with a specialist façade contractor. The panels were over twice the area of previous examples and too large for the established sandwich panel manufacturers so the contractor developed a new production method.
When sealed sandwich panels are exposed to the weather, they experience changes of pressure in the entrained air, so need to be allowed to equalise. We proposed to ventilate the panels through canisters of silica gel desiccant to dry incoming air sufficiently to avoid condensation. The technique is commonly used to condition the expansion airspace above oil in electrical transformers and gearboxes but was not known in the glazing industry. The technique has wide potential for façade applications.
Graham Dodd is charing Facade Engineering Session in GPD Finland 2017.
- Short Bio:Graham Dodd is an engineer who has worked with glass since 1988, designing facades, structural glass assemblies and sculptural installations around the world. He leads a team of materials experts and as an Arup Fellow promotes excellence in design and the use of materials. Graham chairs the Society of Façade Engineering, which supports professional Façade Engineers to advance knowledge and practice.