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Abstract

Artykuł przedstawia możliwości zastosowania modeli numerycznych i korzyści z tego płynących w projektowaniu systemów konstrukcyjnych budynków wysokich. Zostało to pokazane na przykładach autorskich propozycji kształtowania unikalnych form architektonicznych takich budynków przez zastosowanie nowatorskich układów struktur nośnych opracowanych również przez autora, których postacie są rezultatem odpowiedniego zastosowania formuły konstrukcyjnej struktur przestrzennych. Dla złożonych form systemów konstrukcyjnych zdefi niowano w języku programowania Formian stosowne modele numeryczne, których użycie znacząco usprawnia i przyspiesza proces projektowania oraz wznoszenia obiektów budowlanych. Przedstawiono także nowatorskie propozycje projektowania systemów fundamentowania, które umożliwiają bezpieczne posadowienie obiektów silnie obciążonych na gruntach o niewielkiej nośności oraz na terenach aktywnych sejsmicznie.
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Authors and Affiliations

Janusz Rębielak
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Abstract

Problem of predicting the convergence of salt cavern working as natural gas storage is discussed from the theoretical point of view. Two methods of predicting the average annual convergence are compared on a real example of storage cavern. The first is approximate method consisting in extrapolation of stationary convergences calculated for few selected values of natural gas pressure inside the cavern. The second method consists in direct simulation of loading scenario. Calculations were performed for three simple scenarios. Predictions of approximate method are obtained and compared with direct scenario simulations for few-years periods of cavern exploitation. It was possible due to updating of the programs modelling rock massif behaviour by adding the procedures for simulation of multiple-stage loading scenario. Difference between discussed two methods are not big. Differences between average annual convergences for three discussed scenarios are not big also, while local rates of relative convergence significantly vary each other. The results are obtained basing on stationary creeping law with real coefficients. Primary creeping should be included into consideration in the future.
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Authors and Affiliations

Jarosław Ślizowski
Kazimierz Urbańczyk
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Abstract

The paper presents selected aspects of dynamic numerical simulations of an orthotropic steel railway bridge loaded by high-speed trains. The model of moving loads was adopted in accordance with the models set out in the applicable standards. The current European code requirements are referred in which the computer calculations of the dynamic response of the structure are the basis for assessing the suitability of the structure to carry high-speed rail traffic ( v > 160 km/h ). In this research the calculations are based on the author's method of generating traffic roads in Abaqus FEM environment. lt is emphasized in the paper that in most commercial FEM codes (including Abaqus), moving loads are not implemented in modules responsible for defining of loads. The author's approach to this issue allowed to obtain results confirming its adequacy. In the longer term, the authors will develop a plan to adapt this algorithm in order to generale traftic loads on bridges discretized as spatial and plane numerical models.

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Authors and Affiliations

A. Zbiciak
R. Oleszek
R. Michalczyk

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