Retrofitting of pedestrian overpass by Truss-Z modular systems using graph-theory approach |
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| Affiliation: | 1. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;2. Applied Mechanics and Structures Research Unit, Department of Civil Engineering, Chulalongkorn University, Bangkok 10330, Thailand |
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| 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. |
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| Keywords: | Truss-Z Modular lightweight system Organic design Discrete structural optimization Retrofitting Pedestrian ramp Breadth-first search Wavefront algorithm Unknown graph exploration |
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