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A scissors truss supported on two walls. A scissors truss is a kind of truss used primarily in buildings, in which the bottom chord members cross each other, connecting to the angled top chords at a point intermediate on the top chords' length, creating an appearance similar to an opened pair of scissors. scissors truss supported on two walls. A scissors truss is a kind of truss used primarily in buildings, in which the bottom chord members cross each other, connecting to the angled top chords at a point intermediate on the top chords' length, creating an appearance similar to an opened pair of scissors.
The Baltimore truss is a modified version of the Pratt truss. The difference between the Pratt truss bridge and the Baltimore truss bridge is the extra diagonal beams located on the lower half of the truss to help support against buckling from compression and to help control deflection.