Magazine of Civil Engineering, No.1(61), 2016
Building structures. Structural mechanics
METHODS 
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V.S.
Utkin
GOST
R 54257–2010 recommends calculating the reliability of the earth foundations of
structures by probabilistic methods with full statistical information about
random quantities. Currently, there are no guidelines for calculating the
reliabilityof earth foundations by the settlement with limited information
about the parameters. The earth foundation (foundation bed) is a part of a
mechanical system also including the foundation itself and the abovefoundation
construction. 


I.N. Serpik, A.V. Alekseytsev
The development of effective design solutions for many construction
projects requires taking into account the bearing capacity and the cost of
manufacturing the superstructure and the foundation as a single system. We
suggested an algorithm of complex optimal design of a steel flat frame for the
building frame, and foundation posts under its columns on the natural foundation.
It is proposed to minimize the cost of materials of basic variable parts of the
structure. 

CALCULATIONS  

D.V. Tinkov
We have found the exact analytical expressions for the optimal geometry
and minimum mass of a diagonal truss beam made of a material with properties of
linear creep. We have derived simple analytical expressions for the deflection of
the optimal weight of the truss. The deflection of the truss was calculated by
the Maxwell  Mohr formula. We found solution generalizations for any number of
panels by induction. 


M.N. Kirsanov
We have obtained an analytical expression for the deflection and forces
in the rods of a flat truss of beam type in the elastic stage. We found that
the induction method, which has been tested for a wide class of twodimensional
elastic and regular trusses, does not yield a direct and compact result for
trusses with an inclined upper chord. 


A.A. Kikot
A review of literature in research and calculate of coldformed steel
tension members with bolt attachments is presented. Limit States of such
members may be: excessive elongation, a rupture in the weakened crosssection
along the member, a rupture in the net crosssection with the holes at
connection, bearing, block shear. A CFSteel software for calculation of the
strength of tension members was developed. 

STRUCTURES  

A.B. Bondarev, A. Yugov
The article presents a method for calculating the accuracy of largespan
metal rod systems and its mathematical model. The method takes into account the
connectivity of hingedrod metal shells, the technology of their construction
and the gaps in the bolted joints. The latter are caused by the the center of
the hole deviating from its designed position and by the actual shape of the
holes for the bolts designing from the nominal form. 


O.A. Sergeyev, V.G. Kiselev, S.A. Sergeyeva
The problem of determining the optimal crosssectional parameters and
joint positions of linearly elastic space frames with imposed stress and
multiple frequency constraints was considered. The frame was assumed to be acted on by different independent load
systems, including temperature and selfweight loads. The stressstate analysis
includes tension, bending, shear and torsion of beam elements. 

MATERIALS  

S.V. Petinov, R.V. Guchinsky, V.G. Sidorenko
The modified strain criterionbased method for fatigue assessment of
structures is discussed. The damage is estimated based on the specified
parameters of the criterion and the damage summation procedure by employing the
finiteelement method. With a reasonably fine mesh of the finiteelement model
of the ‘critical location’ structure, the condition of the identity of damage
in the material of the test specimen and the structure is provided and,
respectively, the effect of uncertainty on the fatigue life assessment of the
structure is reduced. 