Why do the bars of the bottom chord of a truss have high buckling coefficients in the XY plane?
 

The program generates a buckling coefficient for the weak axis of the bars making up the bottom chord of the truss. When this value is multiplied by the length of the span of the bar, the result is equal to the length of the bottom chord. This coefficient can be excessive if there is transverse bracing at intermediate points of the bottom chord. The user must indicate the correct value depending on how the bottom chord is really braced.

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