Retrofitting of pedestrian overpass by Truss-Z modular systems using graph-theory approach. (March 2015)

• Record Type: Journal Article
• Authors: Zawidzki, Machi
• Is Part Of: Advances in engineering software. Volume 81(2015)
• Page Start: 41
• Page End: 49
• Publication Date: 2015-03
• Subjects: Truss-Z -- Modular lightweight system -- Organic design -- Discrete structural optimization -- Retrofitting -- Pedestrian ramp -- Breadth-first search -- Wavefront algorithm -- Unknown graph exploration; Computer-aided engineering -- Periodicals; Engineering -- Computer programs -- Periodicals; Engineering -- Software -- Periodicals; Periodicals; 620.0028553
• DOI: 10.1016/j.advengsoft.2014.11.004
• Languages: English
• ISSNs: 0965-9978

Abstract

Highlights: Graph-theoretical method of retrofitting of Truss-Z ramp in constrained environment. This exhaustive search method produces better (ideal) solution than meta-heuristics. Large case study in an extremely constrained environment with 124 TZ units. TZ modules with 1:12 (8.3%) slope are used – allowable for self-powered wheelchairs. Abstract: Installing pedestrian ramps is a common improvement towards a barrier-free environment. This paper introduces a graph-theoretical method of retrofitting of a single-branch Truss-Z (TZ) ramp in a constrained environment. The results produced by this exhaustive search method are usually ideal and better than those produced previously with meta-heuristic methods. A large case study of linking two sections of the Hongo Campus of Tokyo University using an overpass in an extremely constrained environment is presented. TZ modules with 1:12 (8.3%) slope are used, which is allowable in most countries for ramps for self-powered wheelchairs. The results presented here are highly satisfactory both in terms of structural optimization and aesthetics. Visualizations of the TZ ramp system, composed of 124 units, are presented.