Search Results

You are looking at 1 - 10 of 11 items for :

  • Civil Engineering x
Clear All
Open access

Marek Kurnatowski

Abstract

The article describes the results of tests carried out to determine the measurable effect of vibrations on the accuracy of measurements with an automatic precise leveller. It contains specification of the research station created to examine the case and description of factors affecting the measurement results. The multi-frequency vibrations were forced on a leveller during measurements and calculated mean errors for each frequency analysed. The range of frequencies for which the measurement was possible was estimated. The obtained results can be helpful in the engineering measurements designing, especially in industrial areas, where vibrations are an inseparable element of the environment.

Open access

Natalia Lasowicz and Robert Jankowski

., Kwiecień A., Jankowski R.: Enhancing the seismic resistance of columns by GFRP confinement using flexible adhesive - experimental study, Key Engineering Materials, 624, (2015) 478-485. 8. Majewska-Lasowicz N., Jankowski R.: Modal analysis of a steel grandstand, Technology and Art, 3, (2012) 94-97. 9. Nhleko S. P., Williams M.S., Blakeborough A.: Vibration perception and comfort level for an audience occupying a grandstand with perceivable motion, Proc. of IMAC-XXVII, (2009). 10. Reynolds P., Pavic A., Ibrahim Z.: Changes of

Open access

Waldemar St. Szajna

References 1. ASTM D 4253 - 00: Standard test methods for maximum index density and unit weight of soils using a vibratory table, West Conshohocken, American Society for Testing and Materials 2000. 2. Brand E.W.: Some observations on the control of density by vibration, in: Evaluation of Relative Density and Its Role in Geotechnical Projects Involving Cohesionless Soils, Baltimore, ASTM STP523 1973, 121-132. 3. Cumberledge G., Cominsky R.J.: Maximum density determination of subbase materials, in: Evaluation of

Open access

Marek Pańtak and Bogusław Jarek

Abstract

The paper presents characteristics of the structural system and results of dynamic field tests and numerical parametric analyses of three-span, two-pylon, cable-stayed pedestrian bridge with steel-concrete composite deck and spans of 25.5 + 60.0 + 25.5 m. The footbridge is characterized by increased dynamic susceptibility of the elements of the suspension system observed during the everyday operation of the structure. The analyses have shown that the high amplitude vibrations of the pylon back-stay cables change the parameters of the structural system and consequently change the value of the natural vibration frequencies of the structure. In the paper, the selection methodology of parameters of the computational model which allows to correctly determine the natural vibration frequencies of the footbridge has been presented.

Open access

Marek Pańtak and Bogusław Jarek

References 1. PN-EN 1990:2004/A1: Eurocode - Basis of structural design (Chapter A2.4), PKN, Warsaw, 2008. 2. Bachmann H., Ammann W.: Vibration in structures induced by man and machine, IABSE, Zurich, 1987. 3. Flaga A., Pańtak M.: Experimental verification of own vibration comfort criteria for footbridges. Proc. Sem. Wroclaw Bridge Days: Footbridges, architecture, design, construction, research, DWE, Wrocław, 2007.

Open access

Oleg Malyshev

Abstract

This paper describes a series of pile tests in sand. T-cross and square cross section piles were jacking by static vertical load with a vibration. Special tests were carried out to examine the influence of T-cross section pile form on it bearing capacity, and the results of comparison bearing capacity on one cub meter of T-cross and square cross section jacking piles in the same ground conditions are described. The jacking vertical static load, sizes of displacements and compaction zones of a ground around a shaft of the experienced piles were investigated.

Open access

Michał Golański

Abstract

The selection of building materials to a huge extent shapes building impact on the environment. In the era of widespread awareness of health problems arising from toxicity of chemical substances, healthy and safe materials of organic origin are even more important. The work discusses examples of the use of straw-bales in thermal retrofitting of buildings located in Austria, Czech Republic and Hungary. The experience of the practical applications of this material in renovations of buildings located in similar climatic conditions indicate that these solutions can be used successfully in Poland. The prevalence of this technology can make a significant contribution to reduction of gaseous emissions, waste, as well as the emission of noise, vibration radiation.

Open access

Kazimierz Flaga and Kazimierz Furtak

Abstract

Steel-concrete composite structures have been used in bridge engineering from decades. This is due to rational utilisation of the strength properties of the two materials. At the same time, the reinforced concrete (or prestressed) deck slab is more favourable than the orthotropic steel plate used in steel bridges (higher mass, better vibration damping, longer life).

The most commonly found in practice are composite girder bridges, particularly in highway bridges of small and medium spans, but the spans may reach over 200 m. In larger spans steel truss girders are applied. Bridge composite structures are also employed in cable-stayed bridge decks of the main girder spans of the order of 600, 800 m. The aim of the article is to present the cionstruction process and strength analysis problems concerning of this type of structures. Much attention is paid to the design and calculation of the shear connectors characteristic for the discussed objects. The authors focused mainly on the issues of single composite structures. The effect of assembly states on the stresses and strains in composite members are highlighted. A separate part of problems is devoted to the influence of rheological factors, i.e. concrete shrinkage and creep, as well as thermal factors on the stresses and strains and redistribution of internal forces.

Open access

Maciej Szumigała, Agnieszka Pełka-Sawenko, Tomasz Wróblewski and Małgorzata Abramowicz

systems from changes in their vibration characteristics: A literature review ; Los Alamos National Laboratory, USA,1, Publisher 1996, 1–136. 5. Wilde, K.: Możliwości zastosowania systemów monitoringu technicznego w infrastrukturze elektroenergetycznej , Acta Energetica, 2 (2009) 107÷114. 6. Knitter-Piatkowska A., Garstecki A.: Wavelet transformation in damage identification by dynamic tests ; PAMM 4,1, (2004) 404-405. 7. Knitter-Piątkowska A., Pozorski Z., Garstecki A.: Application of discrete wavelet transformation in damage detection. Part I

Open access

Volodymyr Sakharov, Oleksandr Lytvyn and Vasyl Pidlutskyi

REFERENCES 1. DBNB.1.1-12:2014 Construction in seismic regions of Ukraine , Ministry of Regional Development, Construction and Housing and Communal Services of Ukraine, Kyiv 2014 (in Ukrainian). 2. Birbraer A.N. Analysis of structures for earthquake resistance (in Russian). Nauka Publishing House, Sankt-Petersburg 1998. 3. SP 23-105-2004. Evaluation of vibration in the design, construction and operation of metro facilities. State Committee of the Russian Federation for Construction and Housing and Communal Complex (Gosstroy of Russia