Trusses are the triangles that connect to the top and bottom cord and two end posts. The trusses make up reinforcement for the bridge that even the load-bearing across the structure. Furthermore, the truss dissipates the load through the structure so the middle of the beam experiences less compression and tension.
As you will see later, there are several variations of the truss, but it starts with a top and bottom cord and a series of trusses. Even the earliest wood truss bridges were built to distribute weight evenly. With this intention in mind, bridges could be built for larger loads. Overall, this makes this bridge design a very strong and dependable option.
With steel construction, truss bridges can take on the traffic of today. What makes truss bridges relevant more today than ever is their effective use of materials.
Keep in mind, less materials means easier construction and less money spent. In fact, each piece is constructed with a definite purpose for truss bridge construction. This way, the construction and use of each steel piece are perfect for the bridge. Because of the simplicity of truss bridge designs, they are often a great fit for accelerated bridge construction. In order to improve construction time, each steel piece can be quickly pieced together. Mobile Newsletter banner close.
Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Prev NEXT. Civil Engineering. The most profound force affecting bridges is gravity, which is constantly pulling at them, trying to drag them down to earth.
Their decking spans open space. Bigger bridges that span longer spaces are more vulnerable to gravity than shorter ones. Similarly, heavier structures are more likely to fall victim to gravity than lighter ones. Bridge failures are a relatively rare occurrence. So, what is it that keeps them from tumbling down due to the force of gravity? A beam bridge has its deck beam in tension and compression. The beam can be squeezed and stretched depending on conditions. The abutments are in compression, which means they are always being squeezed.
An arch bridge supports loads by distributing compression across and down the arch. The structure is always pushing in on itself.
The towers piers of a suspension bridge are in compression and the deck hangs from cables that are in tension. The deck itself is in both tension and compression.
A cable-stayed bridge is similar to a suspension bridge. However, the deck hangs directly from the piers on cables. The piers are in compression and the cables are in tension. The deck experiences both forces. A truss bridge is a variation of a beam structure with enhanced reinforcements.
The deck is in tension. A vertical tension rod called a Kingpost and thus the origin of the truss name divided the triangle in half. After the midth century, builders used metal not wood for tension rods. Builders typically used the Kingpost truss for shorter spans, up to about 35 feet. Queenpost The Queenpost, another early and basic truss type, is a variation of the Kingpost truss.
A Queenpost truss contains two vertical members rather than the one in a Kingpost. These vertical members require the use of a top chord to connect them. This arrangement forms a three panel span in which the center rectangular area may or may not have crossed diagonals. Again, the outer members act in compression and the vertical rods wood or metal act in tension. This truss type can support spans up to about 70 feet.
Howe Truss William Howe patented the Howe truss in
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