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A bridge needs to be able to support the weight of passengers and vehicles traveling on it, and its own weight, against the pull of gravity. Most bridges work by balancing compression and tension. Cable-stayed bridges have roadways that hang from cables. The cables are connected directly to towers. The cables used to hold up the roadway span out from a column, making the cables look like a triangle. Not every cable-stayed bridge has the same type of triangle, some cables reach farther than others, while another bridge might have consistent cables across the whole thing, making the same triangle; the cables can even form triangles inside/outside other triangles when multiple cables go to the same tower.
Truss bridges are bridges supported by frameworks called trusses. Trusses are beams arranged to form triangles.
The triangles on the cable-stayed bridges formed by the cables are needed to keep the bridge from collapsing, or ending up like the bridge in this picture.
If you were to just use cables on one side of the central tower,
the tower would be compressed, but also pull to one side; with
cable across the top and running to the ground on the other side, the tower is
compressed but does not pull towards either side.
Truss bridges are bridges supported by frameworks called trusses. Trusses are beams arranged to form triangles.
A cable-stayed bridge can use different length of cable (making
different triangles) to support the bridge, as shown in the
picture below. (Note: the cables were not easily seen in the picture; it has been edited to show where they are.)
The picture above shows what the trusses look like.
The triangles on the truss bridge formed by the many support beams are needed just like the cable-stayed bridge, to keep it from collapsing when used. Unlike the cable-stayed bridge however, it has support beams insted of cables, and it usesthe same triangle across the whole bridge. Shown in the picture below, the support beams form many acute triangles.
Citations
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