Magazine of Civil Engineering, No.5(49), 2014
Structural mechanics. Building structures
for this half-year
A.V. Perelmuter, S.F. Pichugin
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.
O.V. Kabantsev, A.G.
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.
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
applied for behavior simulation of the both: concrete and steel. Such
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
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A.R. Tusnin, M. Prokic
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.
A.A. Semenov, A.A. Malyarenko, I.A. Porivaev, M.N. Safiullin
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.
Yu.A. Gosteev, A.D.
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.
M.M. Mirsaidov, T.Z. Sultanov
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.
R.A. Abdikarimov, D.A. Khodzhaev
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.
А.I. Grishchenko, A.S. Semenov, S.G. Semenov, B.E. Melnikov
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
obtained by means of direct finite element simulation and homogenization procedure.
Markku Heinisuo, Timo Jokinen
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.