A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Australia’s Arch Bridges and Its First CFST Arch Bridge
Using concrete-filled steel tube (CFST) for compression structures is an innovative technique. Concrete’s higher Poisson’s ratio compared to steel leads to lateral expansion in CFST, which is confined by steel stiffness, enhancing strength. Steel acts as formwork, offering structural rigidity, facilitating off-site fabrication, and efficient on-site installation via concrete pumping, reducing crane and material costs. CFST is applied in various structures, including bridges, buildings, and pilings, with a notable example being a 600-m single-span arch bridge in China. Griffith and Horsham Rural City Councils in Australia have embraced CFST for footbridges, specifically within the Hanwood cycleway project. Two CFST arch bridges, with spans of 22 and 17 m, were erected in Griffith, New South Wales. Footings were installed on-site, while single-span, hollow steel bridge structures, fabricated off-site, were transported to the construction sites. This project, though relatively small in scale, serves as an Australian pilot for this construction method, with both councils assessing its feasibility for longer single-span arch bridges. This innovative technique has faced reluctance from local governments due to additional contingency allowances driven by limited examples. Arches, unlike beams, efficiently utilize the entire cross-section of a member for structural stiffness. During project appraisal, a comprehensive lifecycle cost analysis was missing, leading to a focus on direct cost comparisons among structural types, neglecting factors like maintenance and renewal costs. CFST offers durability and reduced material and installation expenses, often overlooked during project appraisal. Consequently, CFST arches are infrequently incorporated by design and construction companies. The experience gained by Griffith City Council and Horsham Rural City Council is expected to encourage other local government authorities and structural designers to explore this innovative solution.
Australia’s Arch Bridges and Its First CFST Arch Bridge
Using concrete-filled steel tube (CFST) for compression structures is an innovative technique. Concrete’s higher Poisson’s ratio compared to steel leads to lateral expansion in CFST, which is confined by steel stiffness, enhancing strength. Steel acts as formwork, offering structural rigidity, facilitating off-site fabrication, and efficient on-site installation via concrete pumping, reducing crane and material costs. CFST is applied in various structures, including bridges, buildings, and pilings, with a notable example being a 600-m single-span arch bridge in China. Griffith and Horsham Rural City Councils in Australia have embraced CFST for footbridges, specifically within the Hanwood cycleway project. Two CFST arch bridges, with spans of 22 and 17 m, were erected in Griffith, New South Wales. Footings were installed on-site, while single-span, hollow steel bridge structures, fabricated off-site, were transported to the construction sites. This project, though relatively small in scale, serves as an Australian pilot for this construction method, with both councils assessing its feasibility for longer single-span arch bridges. This innovative technique has faced reluctance from local governments due to additional contingency allowances driven by limited examples. Arches, unlike beams, efficiently utilize the entire cross-section of a member for structural stiffness. During project appraisal, a comprehensive lifecycle cost analysis was missing, leading to a focus on direct cost comparisons among structural types, neglecting factors like maintenance and renewal costs. CFST offers durability and reduced material and installation expenses, often overlooked during project appraisal. Consequently, CFST arches are infrequently incorporated by design and construction companies. The experience gained by Griffith City Council and Horsham Rural City Council is expected to encourage other local government authorities and structural designers to explore this innovative solution.
Australia’s Arch Bridges and Its First CFST Arch Bridge
Structural Integrity
Briseghella, Bruno (editor) / Contento, Alessandro (editor) / Liu, Junping (editor) / Shrestha, Krishna (author) / Chen, Baochun (author) / King, Phil (author)
International Conference on Arch Bridges ; 2023 ; Fuzhou, China
2025-02-25
14 pages
Article/Chapter (Book)
Electronic Resource
English
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