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Tom Ellis

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Tom Ellis

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Tom Ellis

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Best range for distance is 75m to 250m.

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Tom Ellis

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Tom Ellis

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* Good foundation
*Arch - compression member, a closed box system
*Arch/tied connection
*Hangers
*Splices
*Concrete deck

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Tied-arch bridges are simply supported beam. The arch is held longitudinally at one end, with the other end free to expand or contract under varying temperatures. If a load is placed on the deck, it is transferred to the arch via the hangers, as the global stiffness of the arch is greater than the bending stiffness of the deck. This creates thrust in the arch, which is balanced by tension in the tie beam. The arch will deform downwards, and it will try to spread its feet, but this is limited by having to stretch the tie beam. Hence there will be an outward movement at the free end.

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https://www.auszac.com/pdf/Balsa_wood_Properties_Guide.pdf

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Truss bridges have high load bearing capacity due to the structure of interconnecting triangles - but the added weight may lead to a poor strength/weight ratio
VS

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There are several different types of truss structures that can be implemented.
https://ojhsbridges.weebly.com/truss-bridges.html#:~:text=There%20are%204%20different%2C%20basic,Pratt%2C%20Howe%20and%20K%20Truss.
VS

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May be a bit harder to make in the build space in terms of connecting each truss member - will split pins be strong enough to hold the balsa strips together?
VS

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Relatively straightforward as we covered them in ES196 in term 1.
VS

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Shortly into my research I realised this kind of bridge would not be suitable for our project as it has foundations that run underneath the bridge, which according to the guidlines of the assessment we are not allowed to have.
Max Brett

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The weight of the deck is supported by a number of almost straight cables that are in constant tension running to one or more vertical towers along the bridge. These cables transfer the froces to the foundations of the bridge.
Max Brett

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-1.5 m long
-min weight applied 5kg
-Maximum vertical deflection

at 5 kg

: 1:

10

of the total bridge length
-No adhesives
-Only use things that can be disasssembled and re used
az

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https://www.google.com/search?q=civil+engineering+equations&rlz=1C1ONGR_en-GBGB937GB938&sxsrf=ALeKk01ZWKbT7i6BnzND7i0REF1mXAu61A:1621250759661&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiO6fvczdDwAhVlQhUIHXz6AS0Q_AUoAXoECAEQAw&biw=1366&bih=625#imgrc=ktutMN141B43jM

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https://www.youtube.com/watch?v=xa5_yyqwbPw

az

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Have to look at truss protypes via method of sections/joints
az

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Materials have to be reusable, would be good to enquire about screws
AZ

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Has good potential for holding a large amount of weight.
Tom Ellis

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The type of anchor needs to be considered, including the height of them
https://ars.els-cdn.com/content/image/3-s2.0-B9780128000588000153-f15-29-9780128000588.jpg
Tom Ellis

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Analysis of the bridge - https://core.ac.uk/download/pdf/84040822.pdf

Suspension bridge calculus - See below

Tom Ellis

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The suspension bridge directs the forces down into the supports, as there is tension in the cables and compression in the posts.
Tom Ellis

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Tied-arch bridge  is a type of bridge that has an arch rib on each side of the roadway (deck), and one tie beam on each arches, that support deck. (1) They are also called  bowstring-arch or bowstring-girder bridge (1) and are part of masonry arch bridges(2).Masonry arch bridges, which have a very long history, and more recent landmark bridges, such as Sydney Harbour Bridge in Australia and the Tyne Bridge in England, are all ‘thrust arches’ and rely on horizontal restraint from the foundations. In many cases, such ‘external’ restraint is not feasible or practical but it can be replaced by a tie between the ends of the arch, thus creating a ‘tied-arch’.