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Good early stage design decisions can halve embodied CO2 and lower structural frames’ cost

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Dunant, CF 
Drewniok, MP 
Orr, JJ 
Allwood, JM 

Abstract

Material efficiency is not currently a common driver of building design. Indeed, in previous studies, we estimated that 12% of the mass of steel used in structural frames would be saved by more accurate specification of steel members. However, this inefficiency is not the main reason structural frames are light or heavy. We show here for the case of steel structures that it is the layout of the grid and the choice of the decking which have the largest impact on the embodied carbon of frames. Using a database of real designs, associated to a generative design model, we quantify the impact of grid and decking selections. Using our model, we find that real designs are relatively efficient economically, but less so environmentally: the typical building frame could have 40–60% less embodied carbon, and be approximately 10–20% cheaper with the right selection. We show how more complex frames have higher embodied carbon than simpler grids. From our findings, we establish a list of design considerations that architects and structural engineers should account for when creating an initial design to lower the embodied carbon: the complexity of the layout, the optimisation of the design and the choice of the decking technology.

Description

Keywords

Efficiency, Design, Steel frames, Optimisation, Design practice, Serviceability

Journal Title

Structures

Conference Name

Journal ISSN

2352-0124
2352-0124

Volume Title

33

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/N02351X/1)
Technology Strategy Board (102477)
Engineering and Physical Sciences Research Council (EP/S019111/1)