Shear Force

Why are there no bending moments or shear forces in a truss frame?

Why are there no bending moments or shear forces in a truss frame?

Trusses are analysed like they have pin connections with the members in pure tension or compression. Pins dont transfer moments. In some cases the joints could be welded and then bending from joint rotation needs to be considered. Same for shear. In some cases you have to look at it around the supports etc. But for a simple truss you assume pin connections and the remaining forces can be neglected.

http://en.wikipedia.org/wiki/Truss

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