No 1 (2015)
- Year: 2015
- Articles: 13
- URL: http://journals.rudn.ru/structural-mechanics/issue/view/669
Articles
APPLICATION OF BIONIC FORMS AND APPROACHES OF ANALYTICAL GEOMETRY TO MODERN ARCHITECTURAL DESIGN
Abstract
The article deals with modern architectural designs, which are based on some kind of bi- onic forms, The shape of these buildings have been studied from the point of view of analytic geometry.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):3-11
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LOST QUICK SOLUTIONS IN LONG STRIP BENDING PROBLEM
Abstract
Aconstruction with the method of the simple iterations the modelproblemof the bending a long thin strip approximateequations is considered. The obtained resolving equationscoin- cide with the equations of the strength of materialsin the principal terms and give the formula for all the theory of elasticity unknowns. The equations are in the agreement with the methods of Saint-Venant, Timoshenko and Reissner for slowly varying quantities.The obtained boundary layer typenew equations for the fast varying values are used when concentrated loads and other singular perturbations take places.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):12-20
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ON ANALYSIS OF FRAMES MADE OF NON-ELASTIС COMPOSITE ELEMENTS WITH TERMAL ACTION TAKEN INTO ACCOUNT
Abstract
In this paper, the author solves the problem of calculating the deformation compressed- bent frames of inelastic composite elements having a variable cross-section and variable stiffness relations shift lengths for the effects of heat. The solution is based on the A.R. Rzhanitsin's theory of elastic composite bars. Static indeterminacy frames revealed by deformation. The expressions for the equivalent modulus of deformation, which takes into account the compressibility of the branches, the branches of the shear deformation of the material, form the backbone of the development of inelastic deformation in them, and the effect of temperature deformations.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):21-25
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MODEL OF MOVEMENT OF METAL IN CALIBRES OF RHOMBIC SYSTEM
Abstract
The deformation model of forming of preparation is considered by its consecutive trans- fer from caliber in caliber. Boundary conditions of movement of metal on the example of mul- tiangular contours of «rhombus-rhombus» system allow establishing cross deformation of preparation and size of broadening of metal.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):25-28
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SPATIAL SYSTEM FROM TWO SHELLS
Abstract
The spatial system consisting of two closed cylindrical covers, connected by one inter- mediate communication is considered. One of covers is loaded with the loading which concen- trated in the ring direction and has been evenly distributed along the forming. Change of size of jet pressure depending on the location of intermediate communication is investigated.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):29-33
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FEATURES OF REINFORCEMENT OF CONCRETE-ENCASED STEEL PENSTOCKS
Abstract
Concrete-encased steel penstocks that lead the water to the hydroelectric units of the Hy- dropower Plants (HPP or PSPP) include internal steel shell and a reinforced concrete shell. Within the areas of compensation on track adjacent structures through which the penstocks passes, internal steel shell separated from the reinforced concrete shell by low-modulus spacer. Existing regulatory documents do not provide specific guidance on the calculated defi- nition of reinforcement of compensatory plots of penstocks. The technique destination of the reinforcement (with the development of reinforcement scheme) of the compensatory plots on the basis of numerical modeling of the stress-strain state of concrete-encased steel penstocks is proposed.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):33-37
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STRENGTH CRITERIA FOR CONCRETE WITH CORROSION DAMAGE IN COMPLEX STRESS STATE
Abstract
Introducing the hypothesis of colmatation conversion of concrete structure with corro- sion damage with stabilization at any ultimate depth of damage, the authors have built a strength criterion of the concrete under complex stress state. In the coordinate system of the principal normal stresses, this criterion describes the surface of the ellipsoid, the characteristic dimensions of which are primarily dependent on the kinetics of corrosion processes in time and depth of neutralization. The presented criterion can be used for solution of problems of the survivability of reinforced concrete structural systems under conditions of simultaneous mani- festation of power and environmental impacts.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):38-42
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CIRCULAR UNDERGROUND PIPE STABILITY ANALYSIS
Abstract
During 100-year history of Structural Analysis Chair (1913-2013) of Moscow land rec- lamation Institute-of Moscow institute of water economy engineers-of Moscow land reclama- tion Institute-of MSUEE a great attention was devoted to behavior of underground pipes ana- lysis. Along with natural and laboratory underground pipes tests sometimes up to a crash, methods were developed to analyze behavior of underground pipes. Continuing this tradition a method is proposed to determine a critical load for circular underground pipe taking into ac- count passive ground pressure free zone. Results are compared and recommendations for sta- bility analysis of circular underground pipe are worked out
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):43-46
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TO THE BEST WAY OF TAKING INTO ACCOUNT THE ADDITIONAL STRESSES, ARISING IN WOODEN SPANS WITH REINFORCED CONCRETE SLAB ROADWAY OF HIGHWAY BRIDGES DURING THE REDUCTION OF AMBIENT TEMPERATURE
Abstract
The article presents the best possible way of accounting the additional shear stresses, caused by the contact of wood and concrete during the reduction of ambient temperature, when designing wooden spans with reinforced concrete slab roadway of highway bridges
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):47-49
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AN ACCOUNT OF RIBS, THAT DON'T COINCIDE WITH LINES OF PRINCIPAL CURVATURES, IN A SHELL ANALYSIS BY VARIATIONAL-DIFFERENCE METHOD
Abstract
It is considered stiffeners, that don't coincide withlinesof principal curvatures,in thevariational-difference method(BPM) analysis of shellsof complex shapedefinedin the linesof the principal curvatures.Ribs aredescribed by theKirchhoff-Clebsch theory of curved bars:a tension, a bendinganda torsion ofa rib are taken into account; shells are described by the Kirchhoff-Love theoryof thin elasticshells.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):50-58
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THE STRESS-STRAIN STATE OF LAYERED COMPOSITE RODS AND BLADES UNDER TORSION
Abstract
In the paper, the technique of the solution of a problem on torsion of layered anisotropic rods by a method of final elements (FEM) is presented. A problem on torsion of rods of rhom- bus cross section of compress blade is considered. In the paper, the algorithm is discovered with the help of FEM, giving the opportunity to calculate displacements, deformations and stresses, and torsion rigidity of multilayered rods of arbitrary section under torsion too. The values of axial displacements of rhombus cross section calculated with the help of FEM are compared with their exact values.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):59-66
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MATHEMATICAL MODEL OF DEFORMING TRANSVERSAL ISOTROPIC CERAMIC COMPOSITE MATERIALS WITH TECHNOLOGICAL DEFECTS IN THE FORM OF PORES
Abstract
N the present work, the deformation model nonlinear-deformed transversal isotropic ce- ramic composite materials with a fragile matrix is constructed in the existence assumption in a material of a matrix of initial porosity which can develop at further to load a ceramic material. Initial porosity is caused by not revealed existing methods of not destroying control techno- logical defects
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):67-73
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AN ACTION OF HARMONIC WAVES ON CYLINDRICAL LAYERS WITH LIQUID
Abstract
Technological Institute of Engineering, Bukhara, Republic of Uzbekistan The fields of dynamical stresses and displacements arising close to cylindrical layer (liq- uid) in viscoelastic medium in the process of the passage of a plane wave are studied. It is shown that the inclusion of the viscous properties of the material medium in analysis on the action of harmonic waves reduces stresses and displacements of the 10-16%.
Structural Mechanics of Engineering Constructions and Buildings. 2015;(1):74-80
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