Truss section between the principle of the division is: According to the load, span and the design strength of wood the size of the section between the division within the scope of the common timber size, take full advantage of winding carrying capacity. Because the total deflection in the wooden trusses, the majority is made up of nodes and joints inelastic deformation (manufacture does not close, shrinkage deformation and stripes bearing deformation) of the cumulative result that if the section between the division is too small, it is bound increase due to increased number node truss deflection, and to the increased workload truss manufacturing. For non-wood truss chord loads, you should try to expand the section between the chord length, reducing the chord of nodes, so that not only can reduce the deflection, and to facilitate the construction, save steel. Section between the division, you should also be careful not to make oblique angle between the rod and the chord is too small to facilitate the work of components and manufacturing. Truss http://www.bzhangjia.com