Topologically preoptimized ground structure (TPOGS) for the optimization of 3D RC buildings

• Published in: Asian journal of civil engineering. Building and housing 2023-11, Vol.24 (7), p.2283-2293
• Main Authors: Alemu, Yohannes L., Habte, Bedilu, Lahmer, Tom, Urgessa, Girum
• Format: Article
• Language: English
• ISSN: 1563-0854; 2522-011X
• DOI: 10.1007/s42107-023-00640-2

As an optimization that starts from a randomly selected structure generally does not guarantee reasonable optimality, the use of a systemic approach, named the ground structure, is widely accepted in steel-made truss and frame structural design. However, in the case of reinforced concrete (RC) structural optimization, because of the orthogonal orientation of structural members, randomly chosen or architect-sketched framing is used. Such a one-time fixed layout trend, in addition to its lack of a systemic approach, does not necessarily guarantee optimality. In this study, an approach for generating a candidate ground structure to be used for cost or weight minimization of 3D RC building structures with included slabs is developed. A multiobjective function at the floor optimization stage and a single objective function at the frame optimization stage are considered. A particle swarm optimization (PSO) method is employed for selecting the optimal ground structure. This method enables generating a simple, yet potential, real-world representation of topologically preoptimized ground structure while both structural and main architectural requirements are considered. This is supported by a case study for different floor domain sizes.