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Abstract

The aim of the research was implementation of fibre Bragg grating sensors and the Aramis system to monitor strain, displacement and stress values in new materials used in the building industry. Selected elements of a residential building made of the Polytech material with a 60% content of the EPS granulate from recycling were tested: a prefabricated wall with a lintel, a reinforced concrete floor slab, a lintel, a reinforced concrete column and a wall. Long-term testing was also carried out taking account of changes in environmental conditions. The methodology of the research was based on the development of purpose-made dedicated FBG strain sensors, laboratory calibration and the embedding of the sensors in the tested element structure. The proposed system of continuous measurements made it possible to determine real strain, displacement and stress values in selected elements of the Polytech structure for a facility founded in a difficult geotechnical terrain (subsoil).
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Authors and Affiliations

Janusz Juraszek
1
ORCID: ORCID

  1. University of Bielsko-Biała, Departament of Civil Engineering, Willowa 2 Street, 43-300 Bielsko-Biała, Poland
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Abstract

Two West Spitsbergen fiords, Hornsund (77°N) and Kongsfjorden (79°N) were compared with respect to their hydrology and zooplankton occurrence on the base of two summer surveys made in 1987 and 1988. Both fiords were found to be influenced by four types of masses: Atlantic Waters, Intermediate Atlantic Waters, Local Waters and Brackish Surface Waters, Intermediate Atlantic Waters, Local Waters and Brackish Surface Waters. The amount of fresh water in both fiords reached up to 10% of water volume of the uppermost water layers. Hornsund in August 1987 was richer in mesozooplankton biomass than Kongsfjorden in 1988. Estimated energie value of pelagic prey of marine birds was 180-500 KJ/100 m3 in Hornsund, and 130-200 in Kongsfjorden. Two major plankton communities were found in both fiords: Pseudocalanus community in the inner fiord basins and Calanus dominated community in the outer areas of the fiords. Plankton occurrence in fiords was not linked directly with the temperature — salinity patterns but rather with dynamic phenomena like upwellings and wind drift of surface waters.

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Authors and Affiliations

J. Marcin Węsławski
Andrzej Jankowski
Sławomir Kwaśniewski
Sławomir Swerpel
Morten Ryg

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