Materials Literature
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The bend of beams interconnected by resilient connections and lying on resilient foundation is considered. The method suggested in works by V. A. Lazaryan and S. I. Konashenko is used in the calculation. It is based on application of the generalized functions.
In the article the description of structural bearing types for roadway bridges and their classification is given. Special attention is paid to effective bearings with elastomeric materials – rubber, pot, spherical ones. Characteristic defects of structural bearings and demands of serviceability are noticed.
The procedure for testing the prismatic steel specimens of heavy constructions to build the kinetic diagrams of fatigue fracture is described in the paper. The kinetic diagrams obtained have been approximated by analytical dependences with unknown parameters, which were found using least squares method.
In this article the numerical and analytical methods of calculation of the stressed-and-strained state of bridge constructions are considered. The task on increasing of reliability and accuracy of the numerical method and its solution by means of calculations in two bases are formulated. The analytical solution of the…
In this paper the possibilities of protection of bridge structures from corrosion by thermal spraying of aluminum or zinc, which provides the long-term protection (approximately 50 years), are presented.
The article describes the research of electrochemical corrosion of reinforcement concrete samples using the method of acoustic emission. The task of research was to identify patterns of acoustic emission signals depending on the mechanism of reinforcement corrosion. Тhe basic research results are outlined. As evaluati…
The general problem of bridge reinforced concrete elements durability is formulated. The research problem is formulated. The model of estimation of bridge reinforced concrete elements resource on a design stage is offered. It enables us to predict the resource as a function of time in dependence on physical-and-mechan…
The article is devoted to the analysis of new temporal normative loads of high-way bridges, the determination of dynamic coefficient and the problems of the using these loads in calculation of endurance and determination of remaining resource of elements of bridge structures.
In this paper on the example of continuous spans of bridges the asymmetry influence of the scheme on the frequency and forms of natural oscillations is investigated. It is shown that under certain span lengths of regular schemes the use of them to determine the span frequencies is possible.
In the article the influence of the electro-surface potential value on change of the suspension viscosity values of pigments was investigated. It was done for pigments different in chemical nature – titanium oxide and ferric oxide. It was demonstrated that at equal dispersed phase concentrations the higher viscosity v…
The conducted experimental researches of «dry» joints with screw-bolt connection have shown that these joints had considerably larger deformations than the joints with the concrete filling. From the viewpoint of greater deformativeness, the «dry» joints under critical loadings are more reliable than the concrete-fille…
In the article the results of studies of the passive vibration test methods and the possibilities of using them for determining and monitoring of technical condition of bridges are presented.
In the article the results of research of bearing capacity of the centrally compressed concrete elements with the use of polymeric materials are presented.
The existing systems used for solving definite tasks, the system description of construction processes and the advent of a new branch – the construction systems engineering – have been analyzed in the article. The possibility of applying the system approach to providing resources for repair of bridges and overbridges…
A.1.2 Definitions, Acronyms, and Abbreviations [Provide the definitions of all terms, acronyms, and abbreviations required to properly interpret the project vision document. This information may be provided by reference to a project glossary.] … A.1.3 References [Provide a complete list of all documents referenced els…
Co/Al2O3 catalyst and a Pt promoted catalyst were characterized and studied by chemical adsorption combined with mass spectrometer and in-situ FT-IR.The characterized results were correlated with the evaluation results by micro-reactor.In CO probe adsorption FT-IR experiments,it was found that there were more reaction…
Melanoma is the most aggressive form of skin cancer and its incidence has increased dramatically over the years. The origin of melanoma is neuroectodermal and it results from the proliferation and malignant transformation of melanocytes that originate from the neural crest and migrate to the skin and hair follicles du…
The nanocrystalline SmCo2 bulk alloy with an average grain size of about 22 nm was prepared by combining high-energy ball milling and spark plasma sintering (SPS), in preparation the amorphous alloy powder obtained by milling was densified and crystallized during the SPS process. The microstructure, crystal structure…
Di proses bubut, Pahat yang mengalami gesekan dengan benda kerja, mengakibatkan temperatur pemotongan. Semakin tinggi temperatur pahat, maka permukaan aktif dari pahat akan mengalami keausan. Keausan pahat merupakan salah satu faktor penting dalam menentukan atau memprediksi umur pahat pada proses bubut. Dalam hal ini…
ZnO-B2O-SiO2 glass was Prepared by high temperature melt-quenching process using ZnO, B2O3 and SiO2 as precursors. The microstructure of ZnO-B2O3-SiO2 glass was investigated by XRD and FTIR.