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because it gives the bridge strength from its shape and all
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∙ 11y ago
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What is the suspension bridge made out of?
Truss Bridges=Trusses have been used extensively in bridges since the early 19th Century. Early truss bridges were made of wood.==in additon the classic American covered bridges are all trusses, though the wooden truss members are covered by walls and a roof, for protection from the elements. Later truss bridges were made of cast iron and wrought iron. Most modern trusses are made of structural steel.=
Where there truss bridges in Europe before than in America?
Yes there were truss bridges in Europe before the United States. Truss bridges formed in the US because of Europeans, but new American designs were made and that is why the truss bridge is more abundant in the US than Europe today.
What innovation or invention made suspension bridges possible?
Suspension bridges are one of the oldest engineering forms, dating back to the 4th century. Modern suspension bridges were made possible by the web truss, invented by John Augustus Roebling. The web truss made a very sturdy, rigid structure that could withstand storms, wind forces, and heavy loads.
Who invented the structural steel bridge?
simeon s. post made the truss bridge, but never received a patent
What makes Truss bridge stable?
Truss bridges are made up of triangles which are quite stable since all loads are carried mostly in tension/compression and not bending. Long members may not be stablebecause of buckling in compression, butt most truss designs will account for that.
What three shapes made from straws would be rigid?
triangle , square , rectangle
How can computers help design bridges in the future?
more percise machinery and shapes, technology can improve and spot errors being made
Why do arches and triangles make truss bridges stronger?
The triangle is a unique geometric shape in that it is stable structurally when the nodes are "pinned". This means that if you load a triangle structure at a node, as long as 2 nodes are fixed against translation (but free to rotate), the legs of the triangle will develop axial forces to transfer the load to the supports and maintain equilibrium. In an ideal truss, the nodes are pinned, the external loads and supports are applied to the nodes, and the supports prevent translation but allow rotation. Additionally, only axial forces are developed in the truss members. An ideal truss made of squares will collapse. Truss bridges are typically made up of triangles, and the gravity loads from the traffic are transferred through a floor frame to the nodes of the truss. When designing the truss, it is usually assumed that the nodes are "pinned". The connections are designed for axial forces only, usually with an allowance for eccentricities which may arise due to the details. Arches are a different type of structural member, and are beneficial structurally because they transfer gravity loads along the length of the span into compression loads at the end reactions. A perfect arch will be entirely in compression (although not equal compression across the cross-section of the member), and is inherently stable. The drawback to arches is that the high compression at the end of the arch must be accounted for in the design to prevent against buckling of the member. This usually results in beefy members, but are still often economical for long spans. Arches can be made up of trusses (see the New River Gorge Bridge), or single members (see the Hoover Dam Bridge). The deck can hang below the arch or be supported about it.
How strong are bridges?
Triangels are the strongest shape so make a triple triangle design i aced it that way +++ The plank bridge is the weakest as it is just a simple beam with no central support or stiffening for the span. The other two can be designed to comparable strength for a given span, but work in somewhat different ways: the truss bridge acts as a beam stiffened by the truss frames, the arch transmits the forces from the centre to its abutments.
Is an octagon similar to a triangle?
They are both shapes and an octagon can be made up of six or more triangles. Other than that they are not similar. A triangle must have three sides. An octagon must have eight sides.
What are steel bridges made of?
steel bridges are made out of steel OBVIOUSLY !!!
What is the difference between a purlin and a truss?
A truss is the structure that holds the roof(or bridge or whatever). Purlins are members holding a few trusses together. A truss is a simple frame made from two force members.
