EFFICIENT CONSTRUCTIONS OF LARGE SPAN COMBINED TYPE ARCHES
In this study, the optimization of the structural scheme of an arched large-span pavement of the combined type was carried out on the basis of an analysis of the existing types of large-span pavements, the nature of their static work, and the distribution of forces in the rods arising during the operation of a structure loaded with various combinations of loads. Based on the calculation results, the optimal geometric parameters of the reinforced concrete belt and steel lattice were determined for the possibility of further design based on the calculated data. The criterion for optimizing the structural scheme of a large-span arched roof of the combined type is the creation of a design model for the redistribution of forces in the rods of a steel lattice based on the total component of bending moments arising under the action of a combination of various loads. The study was based on numerical and graphic modeling, idealization of design schemes, generalization of the data obtained and their analysis. The result of the study is an effective structural scheme of a large-span arched roof of a combined type with geometric parameters corresponding to a rational distribution of forces in the rods of a steel lattice and a reinforced concrete belt. The resulting structural scheme confirms its effectiveness by a significant decrease in the mass of elements due to a decrease in the section of the longitudinal reinforcement of a reinforced concrete belt, as well as due to the redistribution of efforts, which made it possible to significantly reduce the number of compressible elements. The obtained effective structural scheme of a large-span arched roof of the combined type will allow the design of structures of this type with minimum material consumption and, accordingly, cost, which is achieved by the joint operation of the reinforced concrete shell of the roof and a steel lattice arch.