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The Definition of the Truss: Main Characteristics

Truss (fr. Ferme, from Lat. Firmus durable), in structural mechanics, is rod system, which remains geometrically unchanged after replacing its hard knots hinge. The elements of the truss, in the absence of misalignment load rods and extranodal, occur only tension-compression force. Truss formed of rectilinear rods joined at the nodes.

Modern constructors are widely using trusses, especially for covering large spans: sports buildings, truss systems of industrial buildings, bridges. This design can be used by specialists in the manufacture of various types of halls, stage constructions, tents, and podiums.

Operating principle

If arbitrarily fasten the hinges several bars, they will randomly spin around each other, and such a structure is, as they say in structural mechanics, "variable", i.e. if it to press, it will develop as a wall matchbox added. It is quite another thing if you take out of a conventional rod-triangle. Now, how much would you nor pressured, the design can arise only if one of the rods break or detach it from the other. This form has been changed. Trusses consist of triangles. And complex support and boom tower crane, they are made up of large and small triangles.

It is important to know that since any terminals work best in compression-tension than the fracture, the load to be applied to truss rods connection points.

In fact, the truss rods are usually connected to each other, not through the joints and hard. That is, if any two take a rod and cut them off from the rest of the construction, they will not rotate relative to each other. However, in the simplest calculations ignore this and consider that there is a hinge.

Truss calculation principle of cutting out knots

To calculate the truss all the forces acting on the truss are kept to their peers. Once defined the forces acting on the truss, according to the reaction truss supports. After reaction determined, taking any node in which there is only two rod attached and any forces. Mentally cut the rest of the truss and receive a node in which there are several well-known forces (for example, a reaction of supports) and two unknown forces - those forces that act in the uncircumcised contact truss rods. Find the unknown forces in the rods, making the equation of equality of forces on any two axes. Further, knowing the effort, cut the next node, and so on, until the efforts of all the bars to be found.

Truss (fr. Ferme, from Lat. Firmus durable), in structural mechanics, is rod system, which remains geometrically unchanged after replacing its hard knots hinge. The elements of the truss, in the absence of misalignment load rods and extranodal, occur only tension-compression force. Truss formed of rectilinear rods joined at the nodes.

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100002769
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CREATED ON
November 8, 2016
COMPLETED ON
November 9, 2016
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$11
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