Trends of Development of Combined Steel Trusses of the New Generation

New rational combined trusses of covering systems with spans of 12–30 m with smaller dimensions and material capacity in comparison with existing analogues are proposed. A review of works in improving structural forms of steel trusses was made. General approaches to the development of a new generation of steel trusses are shown. Such designs allow to save 17–32% from the cost of their production. The actual task of selection of the main parameters (regulation of stress strain state) of the combined truss, the solution of which allows finding the optimal structural solution with minimal weight is considered. The indicated result was achieved by the usage of high-strength steels and new design forms. Schemes of the developed ones constructions are presented. The use of high-strength reinforcement is proposed for stretched truss elements. A model of the truss with a span of 30 m with such elements for stress-testing has been designed. Ways of saving material in structures are given. Among such methods the development low-element structures is presented, as well as the use of modern ones calculation methods.