W pracy przedstawiono metodę analizy statycznego odkształcania ściskanych elementów żelbetowych z uwzględnieniem nieliniowości geometrycznej elementów i nieliniowości fizycznych materiałów konstrukcyjnych: betonu i stali. Dla stali zbrojeniowej zastosowano model materiału sprężysto - idealnie plastycznego. Dla betonu przyjęto model materiału sprężysto - plastycznego z uwzględnieniem osłabienia materiałowego. Metodę analizy wytężenia układu konstrukcyjnego opracowano z wykorzystaniem metody różnic skończonych. Opracowano efektywne algorytmy rozwiązania układów równań konstytutywnych i przyrostowych równań równowagi prętowych elementów żelbetowych umożliwiających analizę wyboczenia.
EN
Theoretical formulation and algorithmization of the method of the analysis of behaviour of compressed reinforced concrete members subjected to the short - duration static loading were introduced in the paper. The method of analysis of the structure effort is the basis of development of the own numeric procedures and computational programmes using the finite difference method. The received order of the physical nonlinearity of constitutive equations for the concrete makes possible tracing the material soft ening phenomena as well as cracking and crushing in the areas of critical effort of the reinforced concrete bar member. The received order of the geometrical nonlinearity of strain - displacement relationships makes possible the analysis of buckling phenomena of the reinforced concrete bar member.
The Dąbie Lake is the last component of the estuary complex of the Pomeranian Bay and the Szczecin Laguna. Genetically it belongs to the delta lakes. The lake is being very intensively flushed by waters of the Regalica River and at the same time it is transient accumulative basin of the most part on the Odra's waters. The Dąbie Lake has a well developed shore-line with a big number of smaller and bigger islands. Nowadays, the form of the lake is the result of human activity in Szczecin Harbour, which began in the middle of the XIX century. Especially the south-west part of the lake has been changed because of it. Scientific research shows that the Dąbie Lake has the very complicated hydrological conditions. One can notice two-way flows, and the vertical water levels stratification. The Dąbie Lake belongs to the shallow basins. The nearshore (up to 2 m deep) is 100-200 meters wide and it takes 20 % of lake area. More than 50 % of the area is 2-3 meters deep. The area of the lake deeper than 3 meters takes 21,7 % of all area. According to the lay-out of the bottom, the Dąbie Lake is the shallow bowl, which shores raise nearly ortogonally in the east part of the basic and less steep in the west and north part.
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