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Regularity and optimisation practice in steel structural frames in real design cases

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Dunant, CF 
Drewniok, MP 
Eleftheriadis, S 
Cullen, JM 
Allwood, JM 

Abstract

Large amounts of energy and carbon are embodied in the frames of buildings, making efficient structural design a key aspect of reducing the carbon footprint of buildings. Similarly to a previous study which analysed real structures had observed that the unused mass of steel framed building could amount to nearly 46 % of the total mass due to over-specification of the sections, we find a value of 36 %. We observe that this value correlates with the design method, with software-aided design bringing significant improvements and with the design stage, where most of the optimisation seem to occur between the preliminary and tender stage.

We find that neither the regularity of the structure nor the cost, independent of the measure used, correlate with the mean utilisation ratio (ur). Conversely, we observe an apparent reluctance to design beams above a 0.8 capacity ur. This reluctance explains most of the unused mass in buildings. The rest of unused mass consists in cores, trimmers and ties (6 %), some of which bear loads not captured in this analysis but are otherwise necessary for stability reasons, and in edge secondary beams (3 %) which design is constrained, and should not necessarily be considered as ‘unused’ mass.

Description

Keywords

Efficiency, Design, Steel frames, Optimisation, Design practice, Regularity

Journal Title

Resources, Conservation and Recycling

Conference Name

Journal ISSN

0921-3449
1879-0658

Volume Title

134

Publisher

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