FIELD: building structures. SUBSTANCE: principal truss used in long building members such as principal trusses of roofs, ceilings of buildings and structures has top and bottom ledges and rod braces made of glass-reinforced or organic plastic their volume proportion being from 1:0.95:0.3 to 1:0.5:0.2. Principal truss may be made in the form of three- or five-section structure. EFFECT: reduced material and labor consumption. 4 cl, 9 dwg
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