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welded truss design assumptions

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First of all we know true fixity in this type of connections is not possible, although welds are being used. However, some plastic deformation should expected in the connections. You must consider two cases for the web members of the truss. First, you must deal with the in-plane buckling. In this case, the ends are somewhat restricted to move or rotate, so you might use a value of k = 0.9 (using k = 1.0 is conservative because you are not taking the plastic deformation mentioned before).  Second, you must consider the out of plane buckling, in which case, if the lateral restriction is supplied at the top chord but not at the bottom, you might use a value of k = 1.2 (this wuld be the inverted version of case "c" of LRFD'99, p.189). A more rational analysis is preferred.

Ruben Mena.

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