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Two hypothetical bridge designs are presented, one 'lean' and one with significant 'fat'. They are both highway bridges with the same overall geometry. Both are formed from pre-cast beams and in-situ fill using the same concrete mixes and beam types. For illustration, the 'fat' solution incorporates piles and lightweight fill, whereas the ‘lean’ design uses spread footings and a regular granular fill. Embodied carbon (CO2e) for the two bridges is calculated using How to calculate embodied carbon published by the IStructE. The 'lean' solution is shown to contain 38.9% less carbon than the 'fat' solution (885 tCO2e vs 1449 tCO2e). Commentary on the solutions is provided. Reasons for overdesign and options for discouraging overdesign are discussed.
|Title of host publication||International fib Symposium - Conceptual Design of Structures 2021|
|Publication status||Published - 16 Sep 2021|
- 1 Active
1/04/19 → 31/03/24
Project: Research council