Structures with measurable impact
In recent years, sustainability has become central to structural design: in Switzerland, local and regenerative materials, circular design, and planned maintenance transform structures into adaptable and durable systems. Engineering not only builds stability, but also environmental, social, and cultural value, making the structure a tool for resilience and responsible land management.
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In recent years, sustainability has ceased to be a peripheral concern in architecture and has become a central issue in structural engineering. The progressive decarbonization of the construction sector, the scarcity of primary resources, and the need to extend the service life of existing infrastructure have led to a substantial shift in both technical and cultural frameworks. In Switzerland, this process is particularly evident: the tradition of constructional rigor and the quality of the infrastructural heritage provide fertile ground for experimenting with new models of sustainability, in which the structure is conceived as an integrated technical, environmental, and social system.
Recent research demonstrates that structural sustainability can no longer be reduced to an exercise in efficiency or a post-project energy assessment. Today, it constitutes a true operational paradigm, grounded in systemic and interdisciplinary thinking. The logic of «life cycle thinking» has become embedded in the engineering process, redefining concepts of durability, adaptability, and reversibility. Structures are no longer conceived as static entities meant to remain unchanged, but as technical organisms capable of evolving, transforming, and integrating with their context over time.
This shift rests on three principal research and application directions that emerge strongly from contemporary technical debate. The first concerns the relationship between material and territory. The increasing focus on local resources and regenerative materials – from natural stone to biogenic composites, from concretes with alternative binders to reused components – demonstrates that the choice of structural material is also a territorial and economic decision. Sustainability depends not only on direct environmental impact, but on coherence with local supply chains, construction techniques, and cultural practices. Experimental projects in both academic and professional contexts in Switzerland have validated a bioregional approach to structural design, in which knowledge of material cycles and economies of scale becomes an integral part of calculation and dimensioning.
The second direction pertains to circularity. Applying principles of design for disassembly and adaptive reuse now allows structures to be conceived as reversible systems (design for reuse), prepared for changes in use and selective dismantling, to explore new design solutions using materials derived from previous cycles (design from reuse), and to plan for longevity while accounting for long-term uncertainties (future-ready design).
In Switzerland, numerous academic and industrial experiments have shown that designing mechanical nodes, dry connections, and repeatable modules can significantly reduce resource consumption over the long term while maintaining structural safety standards. European guidelines such as EN 15978 and SIA recommendations support this approach, providing a methodological framework that integrates environmental assessments with structural verification and lifecycle management. Digital manufacturing, robotic disassembly, and AI-assisted design experiments further demonstrate how ongoing technological transformations can facilitate the use of reclaimed materials in new construction and the creation of flexible, resilient, and responsive structures, capable of maximizing net benefit between performance risk and long-term management costs (economic, social, and environmental). These approaches are reinforced through the development of probabilistic estimates, useful for assessing the optimal balance of net benefits among different design and management solutions (Real-option analysis).
The third direction concerns infrastructure and asset management. Bridges, tunnels, dams, viaducts, and hydraulic works constitute the bulk of the material footprint of the built environment. Intervening on these existing structures addresses sustainability at its deepest level: the management of already embedded resources. Recent strategies for scheduled maintenance and asset management in Switzerland, also promoted at the federal level, introduce evaluation criteria based on risk, durability, and environmental compatibility. In some cases, reinforcement and partial reuse of existing structures have demonstrated reductions of up to 70% in total emissions compared to reconstruction from scratch. These outcomes do not result from isolated experimental solutions, but from a systemic change in approach: structural design is now conceived as a continuous process of adaptation, monitoring, and maintenance.
Beyond the technical-scientific dimension, structural sustainability also raises cultural and educational questions. The complexity of contemporary construction demands professionals capable of simultaneously managing environmental data, regulatory constraints, functional requirements, and social dynamics. Engineering education must therefore integrate environmental and territorial knowledge alongside mechanics and material technology. Advanced educational experiences developed in Swiss schools of architecture and engineering show a trend toward replacing the linear approach of the «finished project» with a cyclical one, where design becomes a continuous learning process. The aim is no longer to train specialists in resistance, but interpreters of environmental and technical complexity.
In this context, structural sustainability does not merely introduce new materials or reduce emissions: it redefines the very meaning of building. Stability, long the guiding principle of the discipline, is now accompanied by concepts of adaptability, reversibility, and environmental transparency. Durability is no longer solely about withstanding time, but about navigating it with minimal material waste and maximum functional value. Structures become dynamic devices, designed to respond to changing climatic and social contexts. New monitoring, sensor, and digital twin technologies enable real-time knowledge of structural condition, paving the way for predictive maintenance models and intervention decisions based on objective data.
However, this is not merely a question of tools. At a deeper level, it concerns how the discipline constructs, interprets, and legitimizes its own criteria of knowledge. While architectural sustainability is measured by the quality of inhabitation, engineering sustainability is measured by the capacity to maintain and regenerate the territory. Each structure – a bridge, tunnel, walkway, or dam – represents an act of collective trust: ensuring connection, safety, and continuity. Its sustainability is expressed in the balance it achieves between technical efficiency and environmental impact, between longevity and reversibility, and between material cost and public value.
The future of the discipline will be defined by the ability to make this complexity measurable. Regulatory tools and environmental assessment models, such as structural LCA, already allow objective quantification of sustainability performance. Yet the true challenge is cultural: integrating these criteria into the decision-making process, so that sustainability is not a downstream goal, but a design principle.
Ongoing research in Switzerland, uniting academia, public authorities, and professional practice, shows that this transformation is already underway. It is not only a technological transition, but a cognitive one: a change in the very way structures are conceived as components of a broader technical and environmental ecosystem.
Structural sustainability, understood in this sense, is not an extension of architectural sustainability, but its material and methodological foundation. It combines analytical rigor with territorial awareness, data with interpretation, technique with culture.
To build today is not merely to respond to functional or regulatory requirements, but to actively contribute to the environmental and social quality of the territory. In this perspective, structural engineering does not lose its scientific identity; on the contrary, it strengthens it, reaffirming its central role in shaping a sustainable future for the built environment and the nation’s infrastructure.