Composite Bridges with Hot-rolled Sections
Composite Bridges with Hot-rolled Sections
ArcelorMittal – All Regions
- Net-arch bridges with cold-bent hot-rolled sections for the arches allow for a slender and aesthetical bridge design.
- Net-arch bridges are suited for road and railway bridges due to small amount of steel to be used which results in low construction costs.
- Heavy hot-rolled sections (e.g. HD sections) offer high compression strength and a suitable for long span bridges :
>120m for road bridges and >100m for railway bridges. - Long spans exceeding 100m over rivers without the need of any intermediate pillars significantly decrease the risk of damage during floods.
- First introduction of heavy hot-rolled sections in net-arch bridges in Poland in the years 2007-2009
Characteristics
- Light and slender arches with reduced cross section areas are achieved with hot-rolled sections in high strength steel (e.g. HISTARØ).
- Less fabrication efforts and weld volume is required for arches with hot rolled sections compared to welded box sections.
- Simple and standard steel connection between the hangars and the arch.
- The connection of the hangars to the arch is fully visible with no hidden details and is easy to inspect during operation.
- Net-arch bridges can be combined with composite and prestressed concrete decks and offer high flexibility.
- Easy fabrication and reduced material consumptions result in low construction costs and low environmental impact.
- The carbon footprint of net-arch bridges can be substantially reduced by using hot-rolled sections produced from 100% recycled material and 100% renewable energy, like XCarbØ recycled and renewably produced steel.
Applications
MS-15 viaduct over river Lyna in Olsztyn, Poland, opened in traffic in 2017. Two separate net arch structures, each one with a span of 120m. The arches have a height of 21m, an axis – distance of 13.4m and are realised with hot-rolled profiles HD 400 x 744 and HD 400 x 1086 in HISTARØ 460.
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