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Go-Bridge-Challenge—Powerpoint GO BRIDGE CHALLENGE Millennium Bridge, Gateshead, England Photographer Keith Hall © CIVIL ENGINEERING • Transport – roads, bridges, tunnels, canals, airports and sea ports • Water – water storage and drainage, sewerage systems, and sea and flood defences • Geotechnical – mining, earthworks, soil and rock mechanics • Energy – nuclear, onshore and offshore wind, hydropower and marine. • Structural – buildings, bridges, towers, dams, tunnels, retaining walls and other infrastructure. CIVIL ENGINEERS… • use maths, mechanics and physics • are creative and good at problem-solving • understand the importance of teamwork • are never bored as their work is so varied • can be based in an office or on a construction site • can work near to home or travel all over the world. BRIDGE TYPES • Beam bridges • Box girder bridges • Arch bridges • Truss bridges • Suspension bridges • Cable-stayed bridges. Millennium Bridge, London, England Photographer KlickingKarl © A simple bridge solution Beam bridge over a rural road BEAM BRIDGES BEAM BRIDGES • A beam bridge is the simplest and oldest kind of bridge • The further apart a beam bridge’s supports, the weaker it becomes Cheap to construct Easy to manufacture Not very beautiful. Cleddau Bridge, Pembrokeshire, Wales A cross section of a box girder bridge BOX GIRDER BRIDGES BOX GIRDER BRIDGES • Similar to beam bridges • With well-designed girders, a box girder bridge will be stronger than a simple beam bridge Cheap to build Easy to manufacture Not very beautiful. The girder needs careful design. SUPPORTING BEAM AND BOX GIRDERS • To improve the performance of a simple beam or box girder bridge, the roadway has to be supported. • There are three basic ways to do this: • arches • trusses • cables Wye Bridge, Hereford, England Glenfinnan Viaduct, West Highlands, Scotland Photographer Garth Newton © Photographer de:Benutzer:Nicolas17 © ARCH BRIDGES ARCH BRIDGES • Arch bridges are one of the oldest types of bridge and have great natural strength • Instead of pushing straight down, the weight of an arch bridge is carried outwards along the curve of the arch to the supports at each end • These supports (called abutments) carry the load and keep the ends of the bridge from spreading out. Tyne Bridge, Newcastle upon Tyne, England Iron bridge over the River Seven, Telford, Wales UNDER OVER Photographer User:Colin / Wikimedia Commons / CC-BY-SA-4.0 © Photographer Tagishsimon © ARCH BRIDGES ARCH BRIDGES Very strong if well designed Can be beautiful Tend to be very heavy Need extremely strong abutments. Grand Union canal bridge, London Queensferry Blue Bridge, Flintshire, Wales Photographer John S Turner © TRUSS BRIDGES TRUSS BRIDGES • They are mostly empty space, but are very strong • Solid components (beams, arches etc.) are replaced by triangulated assemblies of thin (usually metal) members. TRUSS BRIDGES Very good strength-to-weight performance Possibility of duplicated parts reduces manufacturing costs Can be incorporated into almost any design Can be very beautiful Lots of parts to be manufactured. Suspension footbridge, River Wye, Herefordshire, England Suspension bridge, Inverness, Scotland Photographer John S Turner © SUSPENSION BRIDGES SUSPENSION BRIDGES Aesthetically pleasing, light and strong Can span distances far longer than any other kind of bridge The most expensive type of bridge to build May wobble if badly designed. Clark Bridge, Alton, Illinois, USA Second Severn Crossing, England - Wales RADIAL PARALLEL Photographer Colin Madge © CABLE-STAYED BRIDGES CABLE-STAYED BRIDGES Undeniably beautiful Compared to suspension bridges… Require less cable Are easier and faster to build Need stronger towers. Adding concrete pillars to the Albert Bridge, London makes this a hybrid of beam, suspension and cable-stayed. Photographer David Iliff © HYBRID BRIDGES YOUR TEAM CHALLENGE Design and build a bridge using limited resources and to a given timescale. Millennium Bridge, Gateshead, England Photographer Keith Hall © DESIGN REQUIREMENTS • Your bridge must span a gap of 0.5m and can only be constructed using the materials provided • Your bridge must be strong enough to support a 100g weight (two Mars bars!) placed at the centre of the span, and wide enough to ‘drive’ the toy car along its full length • Your bridge will first be tested to see if it supports the 100g weight. It will then be tested to destruction to achieve bonus points. RESOURCES Each team is allowed the following materials: • A limited amount of newspaper • 4 sheets of A4 card • 20 art straws • 2 metres of string • A roll of sticky tape • Scissors • Pencils • Bridge design sheet PROJECT TIMETABLE • Team consultation 5 minutes • Design session/prototype 15 minutes All prototypes MUST be destroyed before actual construction time commences. • Construction session 40 minutes • Test session 15 minutes • Discussion/questions 10 minutes • Clear away. GO CONSTRUCT.
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