Journal of Structure Research and Practice ISSN:3022-4241(Print) 3022-7267(Online) 한국교량및구조공학회 논문집

This paper presents the conceptual design process of a ring-shaped pedestrian bridge proposed for the Shibuya Scramble Crossing, developed for the IABSE Young Engineers Colloquium East Asia and Germany in Tokyo 2025. The objective is to demonstrate how abstract urban concepts and site-specific constraints can be transformed into a structurally feasible bridge system using undergraduate-level structural engineering knowledge. Based on the symbolic concept of Moyai - meaning “to unite”- the bridge was conceived as a curved triangular ring integrating urban space, nature, and human activity. Structurally, the bridge consists of three curved girder spans supported by inclined arches and hangers, with the arches mutually restrained by a central ring-cable system to resist overturning. A three-dimensional frame model was developed in MIDAS Civil, and an iterative linear analysis procedure was used to estimate the initial equilibrium state of the cable-arch system under self-weight. The results confirm the structural feasibility of the proposed form and its suitability as an educational case study for conceptual bridge design.