Abstract
Timber has been used for construction in Korea extensively over its 5000 year history, and it is only the last century that have seen concrete and steel dominate. When the Yangjaegogae Eco Bridge design competition for the design of a pedestrian and wildlife bridge over one of the busiest freeways in Seoul was announced, the University of Queensland’s Centre for Future Timber Structures developed a design for a large scale, glue laminated arch-and-portal system. This would be lightweight and prefabricated to minimise on-site time, and investigates the potential for the use of timber structures in infrastructure projects.
The design for the bridge sub-structure consists of a series of two-pinned arches - an 87m-span central arch and two 24mspan wing arches, constructed from Glue Laminated Timber, and capable of achieving the required span and rise whilst being relatively light weight. The deck structure, also Glue Laminated Timber, has portal frames at 2.5m centres. The thin,
closely spaced portals allow for a rapid and economical way to achieve the target deck elevation.
The arch abutments were proposed so that pre-site works for foundations could be completed prior to installation with no road closures. When ready, the central arch would be erected in prefabricated segments, requiring only a partial lane closure each time a segment is installed. The wing arches and portals could then be installed easily and quickly via side access. The portals create an elevated construction area, so installation of the remaining bridge features can take place over an extended duration and without disruption to traffic.
The project argues that mass timber, through its lightweight properties and propensity for pre-fabrication, offers valuable reductions in on-site construction time and minimises road closures, which increase the viability of timber in large scale structures and offers an ecologically sustainable solution for infrastructure in cities.
The design for the bridge sub-structure consists of a series of two-pinned arches - an 87m-span central arch and two 24mspan wing arches, constructed from Glue Laminated Timber, and capable of achieving the required span and rise whilst being relatively light weight. The deck structure, also Glue Laminated Timber, has portal frames at 2.5m centres. The thin,
closely spaced portals allow for a rapid and economical way to achieve the target deck elevation.
The arch abutments were proposed so that pre-site works for foundations could be completed prior to installation with no road closures. When ready, the central arch would be erected in prefabricated segments, requiring only a partial lane closure each time a segment is installed. The wing arches and portals could then be installed easily and quickly via side access. The portals create an elevated construction area, so installation of the remaining bridge features can take place over an extended duration and without disruption to traffic.
The project argues that mass timber, through its lightweight properties and propensity for pre-fabrication, offers valuable reductions in on-site construction time and minimises road closures, which increase the viability of timber in large scale structures and offers an ecologically sustainable solution for infrastructure in cities.
| Original language | English |
|---|---|
| Pages | 1-2 |
| Number of pages | 2 |
| Publication status | Published - 2019 |
| Externally published | Yes |
| Event | 5th Pacific Timber Engineering Conference 2019 - Brisbane Convention and Exhibition Centre, Brisbane, Australia Duration: 10 Jul 2019 → 12 Jul 2019 |
Conference
| Conference | 5th Pacific Timber Engineering Conference 2019 |
|---|---|
| Abbreviated title | PTEC 2019 |
| Country/Territory | Australia |
| City | Brisbane |
| Period | 10/07/19 → 12/07/19 |