Building: 5 Broadgate, City of London
Architect: Make architects
Engineer: Buro Happold
Contractor: Mace
Element:Perforated metal beams, roughly 4m long and 40cm deep, joint with other beams and metal slabs.
Material: Steel, prefabricated in factory and transported to the construction site. Cross section is shaped as an I and optimised with circle cuts on the thinnest part to take some weight away. This type of optimised beam is called cellular beam: it can be either fabricated in two parts, which are welded together, or a single part from which the circles are cut off.
