75504 2712-8172 7 33 2012 1-114

RAR RUS 6-13 Branch of RUE Institute BelNIIS – Scientific-technical Centre Derkach Valeriy v-derkatch@yandex.ru

267/2, Moskovskaya str., Brest, 224017 Belarus

Normal cohesive strength of cement mortar in the masonry Normal cohesion of stone and mortar and strength to stretch of mortar in masonry joints depend on many factors that are hardly taken into account in evaluating the normal cohesive strength of stone and mortar. Nevertheless, there are important practical cases where tensile and shearing strength of masonry determine the load carrying capacity of structure. The aim of this work was development of methods for testing the masonry with thin mortar joints and data on normal cohesive strength in such masonry. The results of experimental researches of normal cohesive strength in cement mortar with solid and cavity bricks, porous bricks, silicate bricks and cell-concrete blocks are presented. Experimental dependences for cohesive strength of mortar with referred types of masonry units on compressive strength of cement mortar are obtained. 10.5862/MCE.33.1 masonry masonry mortar cohesive strength cleavage https://engstroy.spbstu.ru/article/2012.33.1/ 01.pdf

RAR RUS 14-22 7004630127 Ufa State Petroleum Technological University Babkov Vadim babkov.ugntu@gmail.com

1, Kosmonavtov St., Ufa, Russia, 450062

Ufa State Petroleum Technological University Gafurova Elina elina_gafurova@mail.ru Ufa State Petroleum Technological University Rezvov Oleg ufaoleg@bk.ru Ufa State Petroleum Technological University Mokhov A. The problems of the occurrence of efflorescence on the surface of buildings’ exterior walls made of vibropressed concrete blocks and the methods of blocking these processes At this article it has been considered the questions concerning the occurrence of efflorescence on the surface of buildings’ exterior walls made of vibropressed concrete blocks. The chemical and mineralogical composition of efflorescences were investigated using the electron-scan microscope and diffractometer. The mechanism of the efflorescence occurrence was disclosed The suitability of hydrophobization as a purifying method of the above mentioned walls from efflorescences was analyzed. The results of full-scale testing of proposed methods are given. 10.5862/MCE.33.2 vibropressed concrete blocks efflorescence chemical composition mineralogical composition hydrophobization https://engstroy.spbstu.ru/article/2012.33.2/ 02.pdf

RAR RUS 23-31 56662851300 0000-0001-8407-8144 Ogarev Mordovia State University Erofeev Vladimir al_rodin@mail.ru Ogarev Mordovia State University Bogatov Andrej bogatovad@list.ru Mordovian State Universiry Bogatova Svetlana bogatovasn@mail.ru Ogarev Mordovia State University Kaznacheev Sergej kaznacheevsv@rambler.ru Lobachevsky State University of Nizhny Novgorod Smirnov Vasiliy protectfun@mail.ru Influence of the operational environment on biological firmness of building composites In modern conditions durability and reliability of buildings are demanded more and more. According to it the special attention starts to be given to the danger of biological degradation of materials and constructions. Microorganisms are capable to occupy the surfaces of all tested kinds of widely used binding agents. However, the specific and quantitative compositions of microorganisms are various under identical service conditions. Having compared the quantity of kinds and types of the fungi developing on the samples of binders, it is possible to evaluate the efficiency of application of those or other building composites and to choose the most suitable materials for corresponding service conditions. It was experimentally shown that composites on a basis of alkaline glass binding agents possess the raised stability in the biologically corrosive environment. 10.5862/MCE.33.3 breakage of glass cement epoxide resin liquid glass biological resistance potential biological decomposers https://engstroy.spbstu.ru/article/2012.33.3/ 03.pdf

RAR RUS 32-42 Petersburg State Transport University Benin Andrey benin.andrey@mail.ru Dresden University of Technology Semenov Artem Semenov.Artem@googlemail.com Peter the Great Saint Petersburg Polytechnic University Semenov Sergey ssgrus@gmail.com

Polytechnicheskay, 29

6701751705 0000-0002-7889-1996 Peter the Great Saint Petersburg Polytechnic University Boris Melnikov kafedra@ksm.spbstu.ru

Polytechnicheskay, 29

Finite element modeling of fracture processes and estimation of durability of the road bridge with account of corrosion damages The direct finite element modeling of deformation and fracture processes in the concrete matrix of the road bridge under the operating loads and the reinforcement corrosion has been performed with account of damage accumulation in concrete. The obtained results of nonlinear boundary value problems in three-dimensional formulation for a representative volume of the lateral part of the bridge show an agreement with the failure character observed in reality. The proposed approach allows identifying potential mechanisms of cracking of reinforced concrete structure at the design stage and analyzing the durability of such structures subjected to corrosion of steel reinforcement. This approach also allows estimating the residual life of partially damaged structure with account of prehistory of its use. However, the practical implementation of this approach requires the large computational effort and additional experimental data on changes in the mechanical properties of concrete due to aggressive environmental influences. 10.5862/MCE.33.4 modeling fracture damage corrosion resource concrete road bridge finite element method https://engstroy.spbstu.ru/article/2012.33.4/ 04.pdf

RAR RUS 43-49 56352359500 0000-0002-5156-7352 Volgograd State Technical University Sergey Korniyenko svkorn2009@yandex.ru

28, Lenina Ave., Volgograd, Russia, 400005

The complex assessment of a thermal performance of the building envelope The complex assessment of a thermal performance of the envelope on the basis of natural measurements and numerical modeling of the heat and moisture transport in building components was executed. On the basis of natural measurements it was shown that thermal performance qualities of a maintained building do not meet standard requirements. For the purpose of establishment of the reason of low level of a thermal performance numerical modeling of the heat and moisture transport in an external wall according to the computer program developed by the author, by two options — on the basis of the actual and design data was executed. It was shown that results of numerical modeling on the basis of actual data will well be coordinated with natural data that confirms reliability of the results received on the computer program. On the basis of numerical modeling with use of design data it was established that the design solution of external walls corresponded to standard requirements for a thermal performance, and, therefore, deterioration of a thermal performance can be caused by the violations allowed during construction and reconstruction of the building. 10.5862/MCE.33.5 thermal performance of the building thermal resistance of the building enclosure computer simulation https://engstroy.spbstu.ru/article/2012.33.5/ 05.pdf

RAR RUS 50-57 Kazakh national technical university named K.I. Satpaeva Bondar Ivan ivan_sergeevich_08@mail.ru Shift tests of cohesive soils under the various loading trajectories In the article the results of tests of loams by static, dynamic and cyclic loads are given. Simple shift (cutting) is typical for soil deformation in natural conditions. At an increase of tangential stresses up to a limiting value the simple shift is completed by exhausting their strengths with break or without break of material uniformity. Shear strength is the basic strength parameter of soils in general and clay soils in particular. The estimation of shear strength of clay soils by tests in conditions of simple shift by static, dynamic and cyclic loads was considered. The diagrams of limiting state confirming the influence of lowfrequency vibration on strength characteristics of cohesive soils were obtained. 10.5862/MCE.33.6 clay soil shearing characteristics of soil https://engstroy.spbstu.ru/article/2012.33.6/ 06.pdf

RAR RUS 58-62 Saint-Petersburg State University of Architecture and Civil Engineering Savin Sergey savinsn@gmail.com Dynamic monitoring of building structures on the example of the concert hall "Pushkinskiy" ramp in Moscow In present time the free vibration method is not widely used in building survey practice. That is why the comparative database on initial dynamic object characteristics does not exist for the majority of buildings. So it is interesting to estimate the principal possibility of using dynamic parameters received earlier by other experts and by other methods. The article presents the results of dynamic tests of building structures of the ramp cinema-concert hall «Pushkin» in Moscow. Modes shapes are presented in the graphs for the relevant natural frequencies. The natural-vibration frequencies were compared with previously obtained values and analyzed. The results of the analysis are the basis for recommendations on the further operation of the building. The conclusion is made about a satisfactory technical condition of the examined structures. The study showed that it is possible to use in the monitoring dynamic parameters received earlier by other experts. However, the dynamic characteristics identification become difficult in this case. 10.5862/MCE.33.7 dynamic characteristics mode shapes fundamental vibration frequencies buildings monitoring diagnostics free vibration method vibration excitation Fourier spectrum technical condition https://engstroy.spbstu.ru/article/2012.33.7/ 07.pdf

RAR RUS 63-69 Saratov State Technical University Zemlyanskiy Anatoliy director@bittu.org.ru Saratov State Technical University Aridov V. Saratov State Technical University Vertynskiy Oleg olvert@bk.ru Active monitoring of bearing structure of St. Trinity Church in Balakovo Previously the authors developed and protected by a patent a new monitoring system based on the dependence of relative permeability of ferromagnetic mediums on acting stresses. The aim of this work is testing this monitoring system in natural conditions and determining convergence of deflected mode values received by system and theoretically calculated. The results of complex examination of St. Trinity Church (the city of Balakovo) are presented in the given work. As a result several variants of tightening reconstruction were suggested and calculated. Results of theoretical and experimental determining deflected mode of basic variant of tightening with using new monitoring system were considered. Divergence of results of theoretical calculation and actual instrumental data did not exceed 5%. 10.5862/MCE.33.8 metal tightening complex survey variant designing active monitoring deflected mode https://engstroy.spbstu.ru/article/2012.33.8/ 08.pdf

RAR RUS 70-75 South-West State University Smorchkov A. South-West State University Kereb S. South-West State University Orlov Denis Den-.-@mail.ru South-West State University Baranovskaya K. Testing the technical condition of maintained building structures The accumulation of damage in structures under mechanical and environmental influences reduces their carrying capacity and changes its technical condition. A new approach to the evaluation of technical condition of building structures. Besides comparing the strength and deformation parameters it was proposed additional criteria: the probability of failure Pf and reliability index β . That allows setting the clear boundaries between categories of technical condition from the positions of structure indestructibility. The example of using the proposed method in practice was given in the article. 10.5862/MCE.33.9 building structures technical condition full-scale inspection checking calculation categories of technical condition probabilistic approach https://engstroy.spbstu.ru/article/2012.33.9/ 09.pdf

RAR RUS 76-88 Mozhaisky Military Space Academy Iskhakov Sh. Mozhaisky Military Space Academy Kovalev Fedor kovaleff81@mail.ru Mozhaisky Military Space Academy Vaskevich V. Mozhaisky Military Space Academy Ryzhikov V. Estimating reliability of buildings and structures according to the methods of the risk of unserviceability This paper analyzes the main problems of estimating the reliability of buildings and structures. The first of these is the lack of quantitative reduction of bearing capacity of structures and subgrade in the transition of their technical condition from one category to another. The second is the lack of instrumental methods for estimating the bearing capacity. On the base of the great theoretical and practical experience in special facilities the authors propose the monitoring capabilities of the bearing elements of such structures under the static and dynamic loads. Using the integral method of diagnosing the state of dynamically loaded buildings based on the search for diagnostic features to reduce the carrying capacity of structures and foundation soil in the transfer function of the object from a known model of “black box” is suggested. These results open new perspectives for research diagnosis of buildings and structures under dynamic loads. The proposed method has been tested and has been implemented in the cross-sectoral guidance document MRD 01-2011 "Guidelines for screening and monitoring of the technical state of loadbearing elements of buildings and structures", developed at the Mozhaisky Military Space Academy. 10.18720/MCE.33.10 testing control risks vibration diagnostics monitoring buildings and structures technical condition bearing elements monitoring system https://engstroy.spbstu.ru/article/2012.33.10/ 10.pdf

RAR RUS 89-92 Peter the Great Saint Petersburg Polytechnic University Abdullayev Gasym

Polytechnicheskay, 29

Rational construction method for linearly extended structures based on alterative options In the development of construction technology of linearly extended structures at the stage work production plan the possibility to reduce the construction time and improving organizational and technological reliability, represented by the presence of different technology options for a range of works and processes usually are not considered. However, to improve the overall process the interaction of adjacent (consecutive) work packages should be taken into account. To optimize the construction process based on selecting the best technology of individual works or groups of works performance it is necessary to build appropriate organizational and technological model. As such a model of building structures an alternative network model can be used, designed specifically to find the best alternative. The proposed use of alternative networks allows receiving sufficient reservation and structural redundancy to significantly increase the organizational and technological reliability while improving economic performance. 10.5862/MCE.33.11 organizational and technological reliability alternative network model digraph structural redundancy https://engstroy.spbstu.ru/article/2012.33.11/ 11.pdf