TRUSS member assignation

Inside the staad model is a lattice truss beam. My understanding on the truss system is that the diagonal, vertical & horizontal bracing are subjected to axial force only.

When I assigned all bracings as TRUSS member, it causes instability. Refer to this B2 staad model - B2.STD

When I assigned the diagonal and vertical bracing as TRUSS member only, the lattice truss beam has no issue. (Understand that the horizontal bracing must take moment at the end connections so that the overall structure is stable). Refer to this B1 staad model - B1.STD

So which method of assignation is correct?

Parents Reply Children
No Data