Re: SHEAR OVER SHEAR PROBLEM Hello; You need to model with a single purlin command. At the same time, due to the necessity of connecting elements to the nodal point of the trusses, purlin modeling should be made with a right angle from its node point to the other truss by taking the short span crossing truss as reference, and the geometry of the long span crossing truss should be arranged so that there is a nodal point where the truss sits.