Evaluation of rational parameters of combined stayed roof

Abstract

Combined stayed roof with the span equal to 60 m is considered in the paper. The framework of the roof is formed by two groups of structural members, which are placed in longitudinal and transversal directions. The main girder and pylons, which form the main frame, just as suspenders are the members, placed in the longitudinal direction. Transversal frames, which are formed by the trusses and columns, are the members, placed in transversal direction. Structural steel S355 is considered as a materials of all rigid members – pylons, columns and girders. Three variants of materials for suspenders were considered. Steel cables with modulus of elasticity of 1.70٠105 MPa and tensile strength of steel wire of 1960 MPa were the first variant. Carbon fiber reinforced plastic (CFRP) with the modulus of elasticity of 1.65٠105 MPa, tensile strength of 2800 MPa and ultimate strain in tension of 1.8 % was the second variant. Hybrid composite element, consisting from steel, CFRP and Kevlar components with the volume fractions of 0.6, 0.2 and 0.2, correspondingly, was the last variant of suspenders. The dependences of material consumption and main geometrical parameters of combined stayed roof were obtained for three above mentioned variants of suspender materials. They were obtained on the basis of numerical experiment, which was carried out using the software LYRA 9.4. It was stated that the rational values of the number of suspenders, transversal frame bay and height of pylon are equal to 8, 6 m and 18 m, correspondingly.