By Terri Meyer Boake
Diagrids are load-bearing buildings made up of metal diagonal grids. They have been first utilized in the nice structures of the flip of the millennium, reminiscent of the Swiss Re Tower in London ("The Gherkin") and the Hearst journal Tower in big apple urban. Diagrids owe their resulting recognition not just to their beautiful aesthetic worth, but additionally to their very tangible advantages: an incredible saving of fabric, an important achieve in open, usable ground zone, and elevated flexibility. The publication appears to be like at modern diagrid constructions reminiscent of Capital Gate (Abu Dhabi), Guangzhou IFC (China), Bow Encana (Calgary), CCTV (China) and the Doha Tower (Qatar) to set up an realizing of the method of the layout of this leading edge sort. At its establishing in 2014, The Leadenhall construction in London would be the first skyscraper with no bearing internal core--thanks to a diagrid constitution. This e-book explains comprehensively for the 1st time the entire elements excited about this new bearing constitution. the writer, skilled in educating, study, and perform (recent book: realizing metal layout: An Architectural layout guide, 2011), has tracked the improvement of this expertise from its beginnings and employs thorough photographic documentation of the development levels of many diagrid buildings.
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Additional resources for Diagrid Structures
The round steel sections allowed for the diamond–shaped “boxes” to be rotated in such a way as to make minimal impact on the façade. In tune with the minimal engagement of the diagrid with the curtain wall, only the color of the mullion (silver), not its thickness, is modified on the curtain wall to acknowledge the placement of the diagrid behind the curtain wall mullion system. Swiss Re was important in the establishment of the nowadays rather standardized use of nodes in combination with straight diagrid members.
For structural and aesthetic reasons, the diagrid tower that was to contain the office spaces was stepped back in from the perimeter walls of the existing historic building. This allowed for the construction of a skylight that bridges between the tower and the base building and provides natural light for the lower levels. As the building was looking for (and achieved) LEEDTM Gold Certification, natural light was an important consideration in the design. 43 Access to natural light and a column–free open office plan were also factors that contributed to the choice of the diagrid as the structural system.
In the ultimate detailed design of the structure it was conceived as a concealed system. 44 This Xsteel 3D model of a node illustrates the complexity of the bolted connections. The plates that provide the load transfer from the diagrid members through the node are precisely machined to ensure a full load path. Paddle plates are used to allow the bolting to take place at the sides of the diagrid members, thereby keeping the connecting elements “tight” to suit the architectural lines of the stainless steel cladding.