I!Jystem". A comparison

indicated [6], that se- cond order system adequate calculation model for girders particularly for Flexibility formulae and calculation model presented can be directly used in the analysis and design of Struc. Div., ASCE, vol. 108, ST 9, Sept., 1982. 6. Czechowskl, A., Investigation into the statics strength lattice girders, In Weldinf of Tubular Structures, Proceedings the Second Interne tonal Conference held in Boston, Massachusetts, USA, 16 - July 1984, Pergamon