Civil Engineering March 2022 | Vol 30 No 2

Civil Engineering March 2022 13 structure is lighter and more transparent than a typical free-form grid. However, it introduced an additional challenge for the glazing, as the large structural grid exceeded the maximum width of a single glass panel. To solve this problem, four triangular glass panels were used in each triangular structural grid opening. The middle glass panel is point supported at each corner via stainless steel rotules, while the surrounding three panels are supported on two sides with edge clamps. To transfer load between the adjacent glass panels, “floating” edge clamps were used. A total of 521 laminated glass panels, each consisting of two fully tem- pered 10 mm clear glass lites with a low-e coating and 50% coverage dot frit were used on this project. To account for various loading condi- tions on the glass, a series of nonlinear finite element calculations were carried out on selected glass panels. MAIN CONTRACTOR AND ROOF INSTALLATION While the collaborative design phase put this project on the path to success, the on-site collaboration and attention to de- tail by Haw & Inglis (general contractor) and LEAF’s installation teams were Atrium gridshell structure under construction Typical one-way sliding pinned connection Typical gridshell node connection (using Novum FF-System)