Igor Romenskii, Alexey Gladkikh, Nonna Tarasenko
Influence of Support Settlement on the Stress-Strain State of the Kislovodsk Type Structural Coating
Donbas National Academy of Civil Engineering and Architecture
Abstract. This article is devoted to the design of spatial lattice structures of structural coatings of the Kislovodsk type. The paper presents the results of a study of the influence of support settlement on the stress-strain state of a structural coating with dimensions in the plan of 30×30 m. The parameters of the stress-strain state of the structural plate were calculated depending on the of the support settlement. It has been determined structural slab elements in which the forces exceed the bearing capacity, depending on support settlement size. This allows you to predict possible defects that occur during operation of the facility. The redistribution of forces in the elements from the size of the support settlement is analyzed. Dependencies between the efforts and support settlement have been also determined. The obtained parameters of the stress-strain state can be used in the design or examination of spatial lattice structures of structural coatings of the Kislovodsk type.
Keywords: structural coating, spatial lattice structure, stress-strain state, support settlement.
Andrey Mironov, Dmitro Belyy, Vladimir Anishсhenkov
Investigation of the Actual Operation of Steel-Reinforced Concrete Slab Structures Using Profiled Flooring
Donbas National Academy of Civil Engineering and Architecture
Abstract. The paper provides an analysis of the actual work of the stress-strain state of a steel-reinforced concrete slab using a fixed formwork from a profiled sheet with dimensions in plan 2,0×0,5 m. Experimental studies were carried out, the ultimate goal of which was to determine the minimum value of the load distributed over the area of the slab, at which the first cracks appear in its extended zone. The bending moment of cracking in the investigated steel-reinforced concrete slab was determined. The serviceability of the steel-reinforced concrete structure has been determined for two groups of limiting states. A comparative analysis of the results obtained with the calculated data in the software package «LIRA SAPR 2016» is carried out. The real load at which cracking occurs in the investigated structure is revealed. Exhaustive conclusions are made on the bearing and deformation capabilities of the structure under study without installing additional reinforcement.
Keywords: experimental studies, slab, profiled flooring (corrugated board), concrete mix, load, shear forces, deflection, crack formation moment.
Vadim Gubanov, Elena Olenich
Effect of the Number of Guys on the Stress-Strain State of Steel Chimneys
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article deals with the influence of the number of back lines on a stress state of chimneys with two levels of in height based on a comparative study. The calculation of structure in the program module Mathcad is developed with the use of the equation system of equilibrium of structural elements and the account of nonlinear behaviour of back lines. Maximum stresses and bending moments in the pipe shaft at various combinations of loads and wind flow angles were determined on the basis of the program module. Numerical research and analysis of influence of different structural parameters on the chimneys with three and four guys in the plan were carried out. Recommendations are given on a effective choice of design solutions for chimneys with three and four flue guys in the plan.
Keywords: stress state, steel chimney, guys, design scheme, loads, metal structures.
Evgeniy Gorokhov, Yaroslav Nazim, Аnton Tanasoglo
Lattice Structures Improvement of Overhead Transmission Line Supports
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article discusses the improvement of lattice structures of overhead transmission lines (overhead lines) by optimizing them and automating the design, including the creation of a computational model of overhead lines as a single system and an algorithm for its solution. It has been carried out the analysis of the stress-strain state and optimization of the structural forms of the trunk of the supports, taking into account the requirements of efficiency and manufacturability. A system of automated one-stage design of overhead line supports has been created. The article presents the design forms of new unified supports of increased reliability, developed taking into account the supporting influence of current-carrying wires and lightning protection cables, as well as the requirements of international standards, efficiency and manufacturability. In the study of anchor and corner supports by weight, possible operating modes were taken into account: normal, emergency and installation for different angles of rotation of the route. Based on the results of the research, rational applications of narrow-base tower-type supports were determined.
Keywords: overhead power line, optimal design, grid support, design model, automated calculation.