This week, construction at Queen Richmond Centre reached a significant milestone with the first of three delta-frames set in place.  Interest in this exciting project has been intensifying with the hoisting of the delta-frame components, the nodes being the largest piece of cast structural steel ever used on a North American construction site.  Architectural firm &Co utilized delta-frames with Stephenson Engineering to create a voluminous atrium that will measure an incredible 70-feet in height.  As reported this week by Matthew Lavoie of Urban Toronto, the three delta-frame structures provide lateral stiffness and carry the gravity load of the columns associated with the 11-storey office sitting atop the existing heritage structure.  Each delta-frame has been designed to support 80-meganewtons of axial compression exerted by the building above (a force of roughly 18 million pounds).

Photos and details, courtesy of &Co, can be found at http://eepurl.com/HySFD.

The article by Urban Toronto can be found at http://bit.ly/1ahJkt6.