Abstract
This paper presents the results of a study of the stress-strain state of a geodesic dome covering the planetarium designed in the city of Nizhny Novgorod. Four design schemes were created in the SCAD with different types of node modeling. A comparative analysis of the effect of the strain capacity of the “BrGTU” type unit on the stress-strain state of the dome cover has been carried out. The results are obtained on the change in the displacements of the structure nodes and internal forces in the dome bars, with rigid and hinged mates. The option of increasing the diameter of high-strength bolts to reduce the overall deformability of the system is considered. On the basis of the obtained results, it was concluded that it is necessary to take into account the strain capacity of the semirigid connections when designing mesh steel domes.
Highlights
Geodesic domes have received great development in the second half of the twentieth century
In SCAD PC there is no possibility to define an actual construction, which includes a thick-walled sphere, which is the middle of the connector and has its own strain capacity
The results obtained in this paper allow us to draw the following conclusions: 1. The analysis of the stress-strain state of the dome models of the covering for loads and impacts with different types of modeling nodes was made
Summary
Geodesic domes have received great development in the second half of the twentieth century. They are still one of the best solutions for curved deck of various types of buildings and structures [1, 38, 39]. There is a considerable amount of research devoted to solving problems of optimization of metal structures [2 - 6], but there are relatively few works devoted to optimal design, taking into account the actual work of the nodes of the joints This is since in the current Russian codes and standards the issue of knot deformability is not considered, the connection is usually perceived as either a hinge or a rigid fixing. At all stages of design, it is necessary to take into account the factor of nodal compliance, its value may change the redistribution of forces in the structural elements [7, 8]
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