No 3 (2016)
- Year: 2016
- Articles: 11
- URL: http://journals.rudn.ru/structural-mechanics/issue/view/695
Articles
EMI-ANALYTICAL ANALYSIS OF A LONG SHALLOW OBLIQUE HELICOIDAL SHELL IN A NON-ORTHOGONAL NON-CONJUGATE COORDINATE SYSTEM
Abstract
The article discusses the problems of analysis of thin shallow shell in the form of oblique helicoid by different methods, particularly, by a semi-analytical method of numerical solution of three equilibrium equations in displacements and by V.G.Rekatch's analytical method, which was not numerically applied in any literature. New variant of analysis of stress-strain state of oblique helicoid shells was developed by applying V.Z. Vlasov's shallow shell the- ory. The equilibrium equations were obtained for three unknown displacements and after the numerical solution was used
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):3-8
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COMPARATIVE ANALYSIS OF THE RESULTS OF CALCULATION OF A THIN SHELL IN THE FORM OF CARVED SURFACE OF MONGE WITH AN APPLICATION OF MEMBRANE (MOMENTLESS) THEORY AND FINITEELEMENT METHOD
Abstract
On the example of existing buildings,the tendency of integrationof thin-walled struc- tures in modern practice can be clearly retraced. The rapid development andthe use of spatial structures became possible due to the existing theories of the calculation, using of computers and computer programs. In this paper, the usage of amomentless theory and a finite element method on the example of a carved surface of Monge are considered, as well as a comparative analysis of theresults of calculation are presented
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):8-13
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THE RESULTS OF DIFFERENT METHODS OF CALCULATION OF A NON-SHALLOW HYPERBOLIC PARABOLOID
Abstract
Two methods of analysis of a non-shallow hyperbolic paraboloid are presented in the pa- per. The first approximate method was fulfilled with the help of the analytical formulas but the second one was made due to SP 52-117-2008 "Reinforced Concrete Spatial Structures of Cov- ers and Floors. Part 1. The Methods of Analysis and Design". Numerical results are given
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):14-20
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THE FORMATION OF CYCLIC SURFACES WITH VARIABLE RADIUS OF GENERATRIX CIRCLES IN AUTOCAD
Abstract
The possibility of the formation of the normal cyclic surfaces and cyclic surfaces in planes of the pencil in AutoCad is discussed in the article. It is shown that the formation of surfaces should be performed on the basis of their compartments. The algorithm of formation of cyclic surfaces, the fragments of programs for the performance of the proposed algorithm are given
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):20-24
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ERRORS IN THE CONCRETE THEORY AND CREEPMODERN REGULATIONS
Abstract
In the article, the theoretical analysis of the major mistakes inherent in the theory of cal- culating of the creep of reinforced concrete constructions is given.The impossibility of using of known linear models of the general theory of creep and its methodsin the calculations of reinforced concrete structures is demonstrated. The necessity of a complete redesign of current Russian rules for the reinforced concreteis revealed
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):25-32
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THE EXPERIENCE OF STRENGTHENING OF PEDESTRIAN SUBWAYS IN THE SATURATED SOILS OF THE KAZAN CITY
Abstract
A review and analysis of the design, construction and monitoring of the technical state of underground pedestrian crossings, erected in the city of Kazan water saturated soils in areas with developed infrastructure is given. Modern and effective methods of erecting of stock piles under the foundations of underground structures are described, as well as amplification of weak water-saturated soil base with using of vertical reinforced concrete elements in cramped urban conditions
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):33-44
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ON COMMUNICATION BETWEEN THE LEVEL OF FORCE LOADING AND POWER LOSSES UNDER DEFORMATION OF REINFORCED CONCRETE STRUCTURES
Abstract
The nonlinearity of the power resistance and the irreversibility of deformation of concrete under alternating loading will inevitably cause significant uncompensated hysteresis energy losses. The extent of these losses depends on the level of loading-unloading. In industrial or transport and communication purposes buildings, these losses account for a significant portion of the total technological energy consumption and cost of enterprise products. It actualizes the problem of quantifying such losses. The article based on the above characteristics of the force of resistance an analytical method for quantitative estimation of these losses and illustrative example that confirms the prospects of the practical use made of developments.
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):44-50
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ANALYSIS OF CHANNEL DEFORMATION IN THE ZONE OF CHECKOUT BUTTRESS OF THE TYUYAMUYUN WATER RESERVOIR AT THE AMUDARYA RIVER
Abstract
The article is dedicated to study of channel deformation occurring in upper zone of the Tyuyamuyun water reservoir at lower current of the Amudarya river. New formulas for change the turbidities of the flow on length of the riverbed on basis of some dependency are derived and presented. The executed calculations on determination of the change to turbidities of the flow on length and volume alluvium in zone checkout buttress of the Tyuyamuyun wa- ter reservoir are given, and the order of analysis is also shown
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):51-58
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THE EFFECT OF THE RATIO OF THE ELASTIC MODULES OF THE "GRAVITY CONCRETE DAM - FOUNDATION" SYSTEM UPON STRESS CONCENTRATION IN THE CONTACT ZONE, AND DISPLACEMENTS OF ADJACENT DAM SECTIONS
Abstract
The effect of the ratio of the elastic module of the "gravity concrete dam - foundation" upon stress concentrations occurring in the contact zone, and displacement on adjacent sections are considered by means of modern CAD FEM software package
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):58-68
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DEVELOPMENT OF THE METHOD OF CALCULATION OF THE STRENGTH OF REINFORCED CONCRETE STRUCTURES OF THE HYDRAULIC ERECTIONS STRENGTHENED BY MEANS OF EXTERNAL REINFORCING ON THE BASIS OF COMPOSITE MATERIALS UNDER ACTION OF SHEAR FORCES
Abstract
To justify the use of the external reinforcement with the composite materials in the strengthening of reinforced ferroconcrete structures of hydraulic erections, a complex research was carried out. The method of calculation of strength of ferroconcrete structures of hydraulic erections, reinforced by external reinforcement by composite materials under the action of cross forces was developed. In order to justify the experimental design procedure the strength of reinforced concrete structures of hydraulic structures models, reinforced by an external reinforcement based on carbon tape and carbon composite slats, under the action of shear forces (with bending moments) was studied.
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):68-74
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ANALYSIS OF STRUCTURES IN THE FORM OF A SHALLOW RETICULATED HYPERBOLIC PARABOLOID WITH ACCOUNT OF GEOMETRICAL NONLINEARITY
Abstract
Numerical procedures for nonlinear analysis of flexible reticulated shells in the form of hyperbolic paraboloid are proposed. Geometrical relationships with account of large displacements and shear deformations are used. The discrete model of shell is reduced to continual model with effective rigidities. The finite difference energy method and continuation method are used for analysis of shallow reticulated shells in the form of hyperbolic paraboloid with different types of boundary conditions
Structural Mechanics of Engineering Constructions and Buildings. 2016;(3):74-80
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