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Propozycja znowelizowanych Załączników krajowych NA do drugiej edycji Eurokodu 3

Gwóźdź M.

Inżynieria i Budownictwo

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2017

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R. 73, nr 10

515--519

PL

Przewiduje się wydanie drugiej, znowelizowanej edycji eurokodów w 2020 r. Opracowane przez Komitet Techniczny nr 128 PKN i zgłoszone do CEN propozycje znowelizowanych Załączników krajowych do drugiej edycji Eurokodu 3 są rezultatem obszernych badań statystycznych wytrzymałości krajowych wyrobów hutniczych, przeprowadzonych w Polsce w latach 2010–2012 w ramach grantu europejskiego pt. „Innowacyjne środki i efektywne metody poprawy bezpieczeństwa i trwałości obiektów budowlanych i infrastruktury transportowej w strategii zrównoważonego rozwoju”.

EN

The second revised edition of eurocodes will be released in 2020. Developed and reported to the CEN by PKN Technical Committee No. 128 proposals of revised National Annexes to the second edition of Eurocode 3 are results of extensive statistical research for tensile strength of domestic steel products. The research was carried out in Poland in 2010-2012 and was funded by a European grant: „Innovative means and effective methods to improve the safety and durability of buildings and transport infrastructure in the sustainable development strategy”.

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A method for reliability assessment of structural components of aircraft and sea-going ships with taking into account a given failure generation model

Tomaszek H., Zieja M., Ważny M.

Polish Maritime Research

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2016

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nr 2

83--90

EN

This paper presents a metod for reliability assessment of structural components on the basis of diagnostic parameters recorded during operation of aircraft and sea going ships. It was assumed that a potential failure may simultaneously concerns surface wear process and fracture of an arbitrary structural component. In order to develop a reliability assessment model some elements of random walk theory were applied. This work covers surface wear density functions of a component. In the case of surface wear the model is based on a difference equation from which , after transformation, a Fokker-Planck partial differential equation was obtained. By solving the equation component’s surface wear density function is achieved. In the second part of the work a generalization of the model was made by introducing to it probability of disastrous fracture of a component. As a result, a generalized Fokkera-Planck’s equation was obtained. By making use of the equation, was obtained a relationship for assessment of reliability of a structural component in case when failure occurs due to surface wear with taking into account possible fracture of the component. In the end a numerical example which shows practical application of the developed method,is attached.

3

Practical applicability and preliminary results of the Baltic environmental satellite remote sensing system (SATBAŁTYK)

Ostrowska M., Darecki M., Krężel A., Ficek D., Furmańczyk K.

Polish Maritime Research

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2015

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nr 3

43--49

EN

The SatBałtyk (Satellite Monitoring of the Baltic Sea Environment) project is being realized in Poland by the SatBałtyk Scientific Consortium, specifically appointed for this purpose, which associates four scientific institutions: the Institute of Oceanology PAN in Sopot – coordinator of the project, the University of Gdańsk (Institute of Oceanography), the Pomeranian Academy in Słupsk (Institute of Physics) and the University of Szczecin (Institute of Marine Sciences). The project is aiming to prepare a technical infrastructure and set in motion operational procedures for the satellite monitoring of the Baltic Sea ecosystem. The main sources of input data for this system will be the results of systematic observations by metrological and environmental satellites such as TIROS N/NOAA, MSG (currently Meteosat 10), EOS/AQUA and Sentinel -1, 2, 3 (in the future). The system will deliver on a routine basis the variety of structural and functional properties of this sea, based on data provided by relevant satellites and supported by hydro-biological models. Among them: the solar radiation influx to the sea’s waters in various spectral intervals, energy balances of the short- and long-wave radiation at the Baltic Sea surface and in the upper layers of the atmosphere over the Baltic, sea surface temperature distribution, dynamic states of the water surface, concentrations of chlorophyll a and other phytoplankton pigments in the Baltic waters, spatial distributions of algal blooms, the occurrence of coastal upwelling events, and the characteristics of primary production of organic matter and photosynthetically released oxygen in the water and many others. The structure of the system and preliminary results will be presented.

4

Numerical investigation of the undrained compression and pull-out capacity of suction foundations in clay

Du J., Du S., Shena S., Yina Z.

Polish Maritime Research

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2015

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S 1

126--135

EN

This paper presents the results of three-dimensional finite difference analysis of suction foundations in uniform and non-uniform clays under undrained conditions. The Tresca criterion was used to simulate the stress-strain response. The bearing capacity of the foundations was investigated, with the degree of nonhomogeneity (kD/sum) of soil varying from 0 to 5, and the embedment depth being up to four times the foundation diameter. The end bearing capacity factor in compression and the reverse bearing capacity factor in tension were both calculated and were compared with each other under different foundation displacements. Numerical results showed that the ultimate bearing capacity factor can have the same value in cases of both compression and tension. The recommended ultimate bearing capacity factor is determined on the basis of the embedment ratio and displacement magnitude, and the displacement is not more than 30% of the foundation diameter. Finally, two equations are proposed to evaluate both the bearing capacity factor and the effective depth factor.