The article presents the results of the analysis of the stress-strain state of the developed jointing node of construction scaffolding (spatial rod temporary structures), since nodal connections are often the weakest elements of such temporary structures. The analysis of the stress-strain state of the node was performed on the basis of a full-scale experiment. The study revealed the most stressed zones in the node structure, as well as the causes of node destruction. Nodes are well known to be the weakest elements of scaffolding. It often happens that structural elements are more stable than the connections between them. Mobile spatial rod structures are very popular in construction at the present time. These structures are used for the construction of ski jumps, stands, stages and scaffolding. They are also used as support scaffolding to support the formwork of floorings. Therefore, the development of new nodal solutions, increasing the bearing capacity of nodal joints and studying their stress-strain state under various loads is a very important task.
In the work, on the basis of the determining relations between the increments of the true stresses and strains, in the framework of the finite-element discretization of the computational domain, the method of solving geometrically and physically nonlinear problems of the mechanics of a deformable solid body is implemented. A number of model problems of deforming elements of three-dimensional elastoplastic structures from solid and porous materials have been solved. It may be noted that there is a good agreement between the numerical results obtained by the proposed method and known solutions; some regularities of the deformation of structural elements made of porous materials were found.
In the framework of an approach based on the mechanics of a transforming structure, a method is proposed for calculating the deformation processes of elastoplastic reinforced structures interacting with soils of complex physical nature. The technique is based on the use of the defining relations, connecting the increments of the true stresses and strains. As an illustration of the performance of the proposed methodology, some results of the calculation of the stress-strain state of the walls of a metro tunnel station at different stages of its construction are given.
The article deals with the investigation of the influence of wind flow over the grandstand with a canopy. Temporary stands with canopies are widely used for various entertainment events. The wind load is dominant for the structures of the stands with the canopy. The SP “Loads and impacts” presents the aerodynamic coefficients only for an open canopy. In the case of stands the nature of wind flow around the structure changes and the wind effect on the canopy structure changes accordingly. In this regard, it is necessary to clarify the wind load on structures of this type. The prototype object is a grandstand with a canopy. The study is performed in the ANSYS CFX software package using variations in wind flow speeds, canopy tilt, and the presence or absence of walls and other obstacles. During the study it was found that the grandstand and obstacles affect the wind pressure on the canopy. Also, quantitative comparison and analysis of the results show that peak pressures have a maximum deviation of the values of aerodynamic coefficients of 43 %.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.