ABSTRACT
Sustainable structural design necessitates a balancing act among economic, environmental, and social impacts, forming the three fundamental pillars of a sustainable framework. Utilizing a case study approach, this paper aims to outline a systematic methodology for selecting concrete structural components. A comprehensive list of sustainability criteria is presented and discussed in detail. The selected sustainability criteria are then applied to identify the most sustainable solution illustratively, among three comparable composite concrete structural alternatives at the material and component level, respectively: (1) natural aggregate concrete, (2) fully recycled aggregate concrete (FRAC), and (3) UHPC-FRAC composite concrete. By applying AHP-TOPSIS method, the findings show that the most sustainable alternative is the UHPC-FRAC composite column, which is a novel option seldom used in practice. The developed model inherently aids engineering teams in comprehending the impact of fundamental decisions undertaken during the design phase of individual structural components.
