A form-finding method for adaptive truss structures subject to multiple static load cases

• Published in: International journal of space structures Vol. 39; no. 2; pp. 93 - 114
• Main Authors: Gade, Jan, Geiger, Florian, Kemmler, Roman, Bischoff, Manfred
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.06.2024
• Subjects: multiple load case form-finding; Adaptive truss structures; force density method; form-finding; statically-geometrically coupled method
• ISSN: 0956-0599; 2059-8033
• DOI: 10.1177/09560599231212707

Form-finding is an essential task in the design of efficient lightweight structures. It is based on the crucial assumption of one single shape-determining load case, usually represented by self-weight. Adaptive components integrated into the structure open a way to even more efficient lightweight designs, as such structures can adapt their shapes to varying external loads and redistribute internal forces. This article presents a method for form-finding of adaptive truss structures subject to multiple, independently acting load cases, also incorporating possible design constraints. To ensure the consistency of the manufacturing lengths of passive elements in all load cases, special constraints are considered. The method enables to reduce sensitivity of the structural shape with respect to various different loads by means of actuation to meet design and serviceability requirements with a lower structural mass compared to conventional design strategies. This is demonstrated within a replaced real-world-like setting of an adaptive suspension truss bridge.