Magazine of Civil Engineering, No.8(60), 2015
Building envelope. Thermophysics and energy efficiency in construction



Subject plan 
for this year 

IX международный конгресс «Энергоэффективность. XXI век»

IX International congress “Energy efficiency. XXI century”

The congress “Energy efficiency. XXI century. Engineering methods for reducing the energy consumption in buildings” took place in St. Petersburg on 11 November 2015. The article describes the main reports of the plenary meeting, primarily devoted to the Russian laws in the energy saving field.
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Обоснование экспресс-метода определения морозостойкости пористых материалов

S.G. Nikolskiy, O.N. Pertseva, V.I. Ivanova
Substantiation of an express-method for determining the freeze-thaw resistance of cellular materials

An express method for determining the freeze-thaw resistance of cellular materials was offered and substantiated in this article. The proposed measurement technology of concrete frost resistance is based on the computation of the value z which is the ratio of the relative decrease of compression resistance R to the relative permanent set ε in the direction which is perpendicular to the pressure.
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Исследование механических свойств кирпичной кладки методом плоских домкратов

S.V. Zubkov, A.V. Ulybin, S.D. Fedotov
Assessment of the mechanical properties of brick masonry by a flat-jack method

The modern Russian methods for defining the mechanical characteristics of brick masonry are based on finding the strength of masonry components (brick and mortar). After getting
the results of laboratory tests of components, mechanical characteristics of masonry are calculated using empirical formulae. Those formulae, however, cannot take into consideration the presence of damages and other factors.  
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Повреждение каменного лицевого слоя в зоне сопряжения с железобетонными перекрытиями

R.B. Orlovich, V.N. Derkach, S.S. Zimin
The damage of a stone facing layer at the junction with reinforced concrete floors

The article provides an analysis of the technical state of a stone facing layer of two-layer facade walls of monolithic buildings at the junction with reinforced concrete floors. The results of the numerical investigations of the stress-strain state of floor-by-floor supported multilayered walls with a facing layer at temperature influences are given.
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Сопротивление ветровым воздействиям поэтажно опертых многослойных стен с облицовочным слоем

V.N. Derkach
Wind load resistance of multilayer walls supported floor-by-floor with a facing layer

The article describes a method for checking the ultimate limit state of multilayer walls supported floor-by-floor with a facing layer under wind loads. We have conducted an analysis of
the resistance of the multilayer wall structure to wind effects, taking into account the strength and deformation characteristics of the cladding and core layers, and the conditions for securing the masonry wall to the frame structure.
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Теплотехнические свойства стеновых ограждающих конструкций из стальных тонкостенных профилей и полистиролбетона

M.V. Leshchenko, V. Semko
Thermal characteristics of the external walling made of cold-formed steel studs and polystyrene concrete

The paper proposes to use polystyrene concrete as an insulating material in wall panels made of light gauge studs. It should solve the problem of thermal bridges in such panels. The strength and the heat conductivity factor for polystyrene concrete with the density of 300-1300 kg/m3 were determined. Results showed that by increasing the density of polystyrene concrete by 4.1 times the thermal conductivity is increased by 3.7 times, which is an almost linear relationship.
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Повышение теплозащиты узлов ограждающих конструкций зданий с применением пеностеклокристаллического материала

D.G. Portnyagin
Improving the thermal performance of the building envelopes with the use of foam glass-ceramics

Recommendations on eliminating the defects of thermal insulation on the basis of the previously carried out thermal imaging surveys were given. Constructive solutions of building envelopes were proposed with regard to modeling thermal fields in ELCUT. A typical solution of thermal insulation of the basement joint is the unit exterior insulation of the basement wall to the level of the facing course bottom.
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Диаграммный метод описания процесса нестационарной теплопередачи

A.S. Gorshkov, P.P. Rymkevich
A diagram method of describing the process of non-stationary heat transfer

Heat transfer through the exterior building envelope in real operating conditions is always unsteady. However, in practice, in most cases, steady-state heat transfer is discussed, characterized by the time-constant magnitude of the heat flow rate and temperatures. The steady-state heat transfer equations are greatly simplified. This makes it practical for developing engineering calculation methods.
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