Multimodal structural optimization for conceptual design

The paper describes an optimization method to support the conceptual stages of structural design. The method, called Blended Close Harmony Search, is a population-based metaheuristic approach that incorporates the following key features: 1) decision variable types that include real numbers defining geometry, discrete structural sections, and topology variables of enumeration (e.g. how many bays in a frame); 2) high-level control of geometry using a parametric CAD program (Grasshopper), so that a single variable can control the location of hundreds of nodes; and 3) a search method that promotes diversity by preventing convergence to one solution, and seeking out, rather than avoiding, local optima. The method is demonstrated on a pedestrian bridge structure, using a three-dimensional lattice for support. Structures and Architecture: Concepts, Applications and Challenges – Cruz (ed) © 2013 Taylor & Francis Group, London, ISBN 978-0-415-66195-9