Magazine of Civil Engineering, No.1(53), 2015
Structural mechanics. Building
structures
ANALYSIS 
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A.V. Perelmuter, O.V. Kabantsev
The problem statement related to modification of
structural design model, when stiffness parameters of the structural
members
undergo changes, was considered. Some data was outlined from the design
practice
concerning design cases that occur during erection and maintenance of
buildings
and structures, when stiffness parameters of some structural members
undergo
changes. 


V.S. Utkin
An experimental theoretical method was
considered
for estimating the residual loadbearing capacity of an individual
reinforced
concrete beam at the operational stage according to the criteria of the
working
strength and durability of concrete reinforcement compressed zone of
the beam.
Integrated methods of beam testing and probabilistic methods of random
variables definition were used. 

STRUCTURES  

A.R. Tusnin, M. Prokic
The article presents the results of the
theoretical
and experimental research of Ibeam behavior under combined bending and
torsion. The analysis of numerical models was carried out, including
calculations in which the physical and geometrical nonlinearity was
taken into
account. Based on the calculations, the parameters of experimental
models and
the value of the applied loads were determined. 


M.N. Kirsanov
An elastic spatial statically determinate truss of
regular type, simulating the rectangular in plan coverage was
considered. In
the plane of the base the truss has two axes of symmetry. Four support
structures (spherical hinge, cylindrical hinge and two vertical rods)
are
located at its corners. An analytic solution was found for forces in
the
rods of the truss. 

CALCULATIONS  
V.V. Lalin, M.O. Beliaev
The problem of verification of different program
suites for structural analysis has recently become an important
component of
the construction science. One of the most extensively used benchmark
problem is
a classical geometrically nonlinear problem of deflection of the
cantilever
beam of linear elastic material, under the action of external vertical
concentrated load at the free end. 

N.A. Solovei, O.P. Krivenko, O.A.
Malygina
The method of solving static problems of nonlinear
deformation, buckling, and postbuckling behavior of thin elastic
inhomogeneous
shells is based on the geometrically nonlinear equations of the 3D
thermoelasticity theory and use of the moment finiteelement scheme. A
unified model has been created based on the
universal spatial finite element with additional variable parameters. 

O.G. Ivanov, S.V. Shlychkov
The paper presents a computation procedure of
physically nonlinear prismatic shells with the sealed ends. It is known
that
plates reinforced by stiffening ribs and located in the elastic medium
can be
calculated in a similar way as uniform ones (without reinforcements).
In this
case the effect of edges on the stressstrained state of plate was
calculated
in the form of the elastic support by Winklerian model. 

METHODS  

M.K. Usarov
The paper is dedicated to improvement of plate
theory in order to take into account forces, moments and bimoments,
generated
by nonlinear law of displacement distribution in plate crosssections.
Integral
correlations for defining forces, moments and bimoments were given. The
developed bimoment plate theory is described
with two independent twodimensional systems with nine equations in
each. 

G.N. Shirunov
The threedimensional problem of the theory of
elasticity related to isotropic layer compression by normal load,
distributed
on a limited area, is solved by the method of initial functions (MIF).
The layer
divided into separate sub layers with different elastic characteristics
serves
as a model of the multilayer foundation. 
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