Magazine of Civil Engineering, No.5(49), 2014
Structural mechanics. Building structures


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Warsaw build 2014

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Об оценке уязвимости строительных конструкций

A.V. Perelmuter, S.F. Pichugin
Issues on estimation of building structure vulnerability (rus)

The development of probabilistic methods of computation for building structures has mainly been aimed at improving the computation methodology. The attention was given to the accumulation of actual data as well to the research of statistical properties of influence and parameters of strength. However, it is necessary to mention that hardly ever new investigations have been done in the sphere of probabilistic evaluation. The priority attention was paid to the first ultimate state.    
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Учет изменений расчетной схемы при анализе работы конструкции

O.V. Kabantsev, A.G. Tamrazian
Allowing for changes in the calculated scheme during the analysis of structural behaviour (rus)

Traditional calculation technologies are based on substantial simplifications and do not allow for very important (and in certain cases - crucial) situations related to changes in the design model during the life cycle of a building. The objective of the study was to analyze the processes that lead to changes in the structural design scheme, and to determine general principles of modeling changes in the design model.
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METHODS

Четырехузловой конечный элемент для моделирования поведения тонкостенных железобетонных конструкций

S.Yu. Fialko
Quadrilateral shell finite element for analysis of thin-walled reinforced concrete structures (rus)

The paper presents the quadrilateral finite element for analysis of thin-walled reinforced concrete structures. The deformation theory of plasticity, formulated in terms of residual strains, is applied for behavior simulation of the both: concrete and steel. Such an approach allows us to simulate a cyclic loading as well as a dynamic one. The stress – strain diagram, proposed by the European Committee on concrete, is used for the compressed zone of concrete.  
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Изгиб, кручение и асимптотический анализ пространственной стержневой консоли

M.N. Kirsanov
Bending, torsion and asymptotic analysis of the cantilever bar (rus)

The paper estimates deformation of elastic, statically determinate cantilever truss of the large internal volume which is subjected to bending and torsional loads for an arbitrary number of structure zones. The volume is increased by replacing flat sides of the truss with raised ones. Forces in the bars are determined analytically by cutting nodes of the truss. We derive simple analytical expressions for deflection, which allows selecting the optimal size and asymptotically compare the design flexibility to the known systems.
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STRUCTURES
Работа симметричных двутавровых сечений при развитии пластических деформаций и действии изгибающего момента и бимомента

A.R. Tusnin, M. Prokic
Behavior of symmetric steel I-sections under combined bending and torsion actions allowing for plastic deformations (rus)

In steel structures, the combination of both a bending moment and bimoment actions on I-beam members is possible in many cases. In the elastic stage of work, the material bearing capacity check is based on maximum normal stresses, which for symmetric I-beams are the sum of moment and bimoment stresses. The maximum stresses are compared with the calculated resistance.
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Напряженно-деформированное состояние высокопрочных болтов фланцевых соединений в укрупнительных стыках стропильных ферм

A.A. Semenov, A.A. Malyarenko, I.A. Porivaev, M.N. Safiullin
Stress-strain behavior investigation of friction grip bolts in flange joints of trusses (rus)

This article presents the results of the numerical research on bolted flange joints in the field joint of trusses. A computational model was chosen for SCAD. The geometrically nonlinear calculation was made. The paper shows the correlation between stress and strain behavior of bolts and load intensity. Numerical results of the SCAD model calculation are compared with the results of the classical methods and ANSYS model calculation. The spatial stress-strain state of the connection is shown.
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CALCULATIONS
Влияние формы на аэродинамические характеристики балочных мостов

Yu.A. Gosteev, A.D. Obuhovskiy, S.D. Salenko
Influence of the shape on aerodynamic characteristics of girder bridges (rus)

For accurate calculation of wind loads and prevention of aeroelastic superstructure vibrations it is necessary to research aerodynamic characteristics (ADF) of both particular designed bridges and typical superstructure sections. The analysis of information on the issue showed that the impact of the cross-sectional shape on ADF of a bridge needs additional research. The object of the study was typical cross-sections of girder bridge superstructures.
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Оценка напряженно-деформированного состояния грунтовых плотин с учетом нелинейного деформирования материала и конечных деформаций

M.M. Mirsaidov, T.Z. Sultanov
Assessment of stress-strain state of earth dams with allowance for non-linear strain of material and large strains (rus)

The paper presents results of studies on the dynamic behavior and stress-strain state of high earth dams with allowance for non-linearly viscoelastic properties of soil, large strains and heterogeneous features of a structure. The studies consider the effect of non-linearly viscoelastic properties of soil, large strains, heterogeneous character of a structure and geometrical parameters of a structure on the change of the stress-strain state of earth dams in pre-resonant, resonant and post-resonant modes of structure oscillations.
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MODELS
Компьютерное моделирование задач динамики вязкоупругих тонкостенных элементов конструкций переменной толщины

R.A. Abdikarimov, D.A. Khodzhaev
Computer modeling of tasks in dynamics of viscoelastic thin-walled elements in structures of variable thickness (rus)

The paper presents a numerical method and algorithm for solving tasks in dynamics of viscoelastic thin-walled elements in structures of variable thickness. The equations of motion concerning deflections are described by partial integro-differential equations (PIDE). Using Bubnov-Galerkin’s method, based on the polynomial approximation of deflections, the task is limited to the study of the system of ordinary IDEs, where the independent variable is time.
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Влияние структурных параметров кладки на эффективные упругие свойства и прочность

А.I. Grishchenko, A.S. Semenov, S.G. Semenov, B.E. Melnikov
Influence of structural parameters of the masonry on effective elastic properties and strength

Two phase masonry model, which contains elastic mortar and elastic bricks, is analyzed numerically in order to evaluate sensitivity of effective elastic moduli and strength properties to a deviation in the masonry structural parameters. Different methods of masonry homogenization are studied. Effective elastic moduli of the masonry representative volume element are obtained by means of direct finite element simulation and homogenization procedure.
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Асимметричное огневое воздействие на цилиндрические композитные колонн

Markku Heinisuo, Timo Jokinen
Tubular composite columns in a non-symmetrical fire

A considerable number of studies have been conducted worldwide on fires that act on all four sides of a column (symmetrical fire). These cases are used for the validation of the analysis models developed in this study. In real buildings the columns are often embedded. If the fire does not act similarly on all surfaces of the column (non-symmetrical fire), it is extremely difficult to predict how the column will behave.
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