Pedestrian and cyclist bridges are promising and challenging applications in aluminium allowing evocative evaluations of their characteristics regarding: a) structural optimization with bespoke elements, reducing manufacturing, handling, and installation costs, bdurability with practically maintenance-free service life, and c) beneficial and consistent sustainability characteristics. Quantitative comparisons with other building materials provide supportive evidence.
In practice, the lightweight aluminium structure – often less than half the dead load as with other materials - enables delivery in a single piece of considerable span lengths and recently increased demands for larger clear width. Life-cycle-cost calculations demonstrate their superiority with uninhibited service life. In confirmation of our earlier results we may draw upon similar references of various companies as well as examples of the excellent behaviour and state of existing aluminium footbridges from around the world.
In an earlier comprehensive study of characteristic sustainability indicators we derived markers for the superiority of aluminium structures (for instance weight ratio aluminium vs. steel) - easily attained with footbridges. A correct holistic energy balance calculation also shows CO2 benefits over service life.
Growing sensitization in society in matters of energy saving and environmental pollution demands for net-zero carbon targets and environmentally friendly structures, while maintaining a balance to economy and acceptable living standards. In practice the problem lies often with the poor acknowledgement of factual information by clients/authorities/contractors - aluminium with an up-cycling at the end of a long service life, not ending up in an expensive landfill or potentially a health hazard polluting the environment. Norms and legislation obligating a circular economy of products may be a remedy, providing convincing persuasion through the implementation of uniform evaluation standards – see emerging ECCS recommendations, EuroNorms (EN 15804) and parliamentary action (EU).
Co-Author: Alexandros Kosteas-Kostaropoulos, PhD, MSc (CASS Lon), BSc (NYU, USA)
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