Magazine of Civil Engineering, No.7(75), 2017
S.D. Nikolenko, E.A. Sushko, S.A. Sazonova, A.A. Odnolko, V.Ya. Manokhin
Disperse reinforcement of concrete greatly contributes to the
properties of the latter. Most research has dealt with the properties
of disperse reinforced concrete and influence of disperse reinforcement
on structures under a static load of one sign or for a regular dynamic
load that is not highly intensive. In practice there might well be
alternating dynamic impacts that are highly intensive and over the
calculated ones, e.g., seismic ones.
K.O. Fryanova, V.A. Perminov
mathematical modeling of forest fires actions on buildings and
structures has been carried out to study the effects of fire intensity
and wind speed on possibility of ignition of buildings. The crown
forest fire is introduced as a heat and mass source defined by the
empirical values of average crown fire temperature and vertical gas
velocity at the top crown surface dependent on fire intensity.
N.S.Sevryugina, M.A. Stepanov
issue of engineering systems safety in particular of vertical
transportation is revealed. Inconsistency in the implementation of
theoretical developments in practice is defined because of the
probabilistic calculation of the parameters modeled by monotone-logical
functions, when real systems are non-monotone functions. The duality of
the results of the processes theoretical description is revealed.
D.A. Dedukh, V.L. Schsuzkiy, A.A. Kuzmenko
article presents results of investigation study of physical and
mechanical properties of spun and vibrated samples. Heterogeneity of
freshly placed concrete was assessed for change in water to cement
proportion, residual water content, density throughout the spun sample
height, as well as changes in mechanical properties of hardened
V.I. Klimovich, K.V. Pariev
of experimental researches of scour protection for marine ice-resistant
platform (MIRP) "Prirazlomnaja" at impact of irregular waves together
with a current are presented and analyzed in the article. Experimental
researches were executed taking into account maintenance of the basic
S.V. Klyuev, A.V. Klyuev, A.D. Abakarov, E.S. Shorstova, N.G. Gafarova
One of the options to improve the reliability and increase the service
life of concrete structures can be a reinforcement of the total volume
of fine-grained concrete with different fiber types. The article
presents the results of complex researches on studying of influence of
parameters of the dispersed reinforcement (fiber, length and type of
fiber, dosage by volume) and the material of the fibers of strength of
disperse-reinforced fine-grained concrete on a stretching at a bend,
the estimation of efficiency and accountability in the calculation of
M.P. Sainov, A.O. Zverev
results of numerical study of stress-strain-state (SSS) of a rockfill
dam with a face whose main watertight element is a polymer geomembrane.
Analyses were conducted with consideration of non-linearity of contact
interaction of structure elements and non-linearity of soil behavior.
Bar finite elements were used for modelling of the thin geomembrane.
N.V. Gusakova, K.E. Filyushina, A.M. Gusakov, N.N. Minaev
present study is devoted to development of methodology used for optimal
selection of space-planning and structural solutions of low-rise
buildings. Objective of the study is developing the system of criteria
influencing the optimal selection of space-planning and structural
solutions of low-rise buildings and structures aimed at enhancing the
efficiency of capital investments, energy and resource saving, creating
comfortable conditions for the population considering climatic zoning
of the construction site.
S.A. Kosenko, S.S. Akimov
the present study, we analyze the operation performance of modern
differentially quenched rails in comparison with domestic
volume-quenched rails and Nippon Steel rails (Japan). For evaluating
the wear resistance of rails, in the present study we carried out
measurements of their side wear at curves of small radius. As a result
of the study, it was found that the resistance to wear of
differentially quenched DT350 rails 1.5–1.7 times exceeded the
resistance of volume-quenched T1 rails.
D.A. Vakulenko, R.A. Turusov
Composite materials have high physical and mechanical properties, but
their widespread use is hampered by a lack of tightness (impermeability
to moisture and gases). Mainly this is due to the stress-strain state
of the composite structure at the micro level as a result of a
comprehensive extension of the polymer owing to the adhesion of the
matrix to the fiber.
Yu.Yu. Galkin, S.A. Udodov, L.V. Vasil'eva
It is widely recognized that the effect of loading at the early stages
of hardening enables to increase strength characteristics of cement
systems and composites based on them. Of particular interest is a study
on the effect of compression of aluminate cements on physicomechanical
characteristics, hydration process and phase transformations.
L.V. Zakrevskaya, P.A. Lubin, S.N. Avdeev, I.A. Gandelsman, S.V. Filippov
work presents the results of research on the strengthening of soil
basement in the center of the urban nucleus of Vladimir, which are
loam, sandy loam in soft-plastic state, and also sandy loam with silt.
The technology of applying the strengthening composition in the soil
has been developed.
T.V. Ivanova, J. Guan, O.P. Nesterova, S.V. Prokopovich, A.M. Uzdin, D.A. Ivashintzov
object of the investigations is seismic input models used in structure
designing under the conditions of limited seismological information.
The aim of the given investigation is to propose a new variant of a
seismic input model, which should be generated for the structure under
consideration, taking into account main peculiarities of actual seismic
excitations. The method of design seismic input generation by means of
its presentation as a sum of velocity impulse and multi frequency
excitation has been developed.
Ju.A. Kalugina, D. Keck, Ya.A. Pronozin
The paper analyzes the differences in carrying out compression tests in
accordance with the regulatory documents of Russia and Germany and
subsequent processing of the obtained data. The paper gives the reasons
for significant differences in the values of compression and design
deformation moduli obtained from the compression test data in
accordance with Russian and German National Building Codes.
A.V. Indeykin, S.V. Chizhov, E.B. Shestakova, A.A. Antonyuk, N.I. Kulagin, V.N. Smirnov, V.V. Karpov, D.M. Golitsynsky
The development of methods for rapid assessment of the
reliability of span structures of beam railroad bridges is relevant in
connection with the trend towards increasing loads from the reversing
freight rolling stock and the speeds of movement on the main transport
with a mixed cargo-and-passenger turnover. This problem is especially
urgent for the creation and implementation of special technical
conditions (STC) for the design of bridges on high-speed lines (BCM),
as in Europe and in America, the process of improving the regulatory
framework is actively being implemented and innovative developments in
I.Ya. Kharchenko, A.P. Pustovgar, S.A. Pashkevich, A.V. Eremin, I.S. Ivanova, Yu.M. Bazhenov, A.I. Kharchenko
The features of expanding cement strength and structure formation at
different constrained deformation conditions were studied (without
constraint of deformations, uniaxial constraint of deformations,
biaxial constraint of deformations, and triaxial constraint of
deformations). The study was conducted for three doses of 5 %, 15 % and
25 % of expander on the calcium sulfoaluminate basis in Portland cement
of CEM 42.5 mark.
P.E. Bulanov, L.F. Mavliev, E.A. Vdovin, E.M. Yagund