Wybrane zagadnienia projektowania stalowych konstrukcji prętowych z wykorzystaniem programu Autodesk Robot Structural Analysis
Nowoczesne metody projektowania konstrukcji stalowych w coraz większym stopniu wykorzystują zaawansowane metody modelowania i analizowania układów konstrukcyjnych z wykorzystaniem komercyjnych programów komputerowych. Poprawne korzystanie z nowoczesnych narzędzi projektowych wymaga jednak od użytkowników tychże programów dobrej znajomości podstaw modelowania konstrukcji. Niniejsze opracowanie nie tylko ma na celu przybliżenie podstawowej wiedzy w tym zakresie, ale również, dzięki licznym przykładom, może stanowić istotną pomoc w rozwiązywaniu zadań z dziedziny analiz wyboczeniowych oraz wykonywaniu obliczeń statycznych stalowych konstrukcji prętowych z zastosowaniem analizy II rzędu.
Wood-frame buildings are very common in regions that are exposed to earthquakes. Most of residential buildings are constructed using this technology; therefore, the seismic resistance of them is really essential in order to prevent human losses and structural damage. The aim of the present article is to show the results of the detailed numerical FEM analysis focused on the seismic behaviour of the wood-frame house with different in-wall insulation materials. The results of the study clearly indicate that using polyurethane (PU) foam instead of mineral wool leads to the increase in the rigidity of the structure and, therefore, to the substantial reduction in the structural response under different seismic excitations. The results also show that, generally speaking, the level of reduction in the displacement response increases with the increase in the magnitude of the earthquake, which even furthermore benefits the application of PU foam as an insulation material. It has also been concluded that the method of using PU foam can be successfully applied not only in the newly constructed wood-frame houses but also in existing ones since replacing the mineral wool with PU foam is relatively easy and not so much expensive.
Wstępne badania eksperymentalne stalowych łączników balkonowych w aspekcie nośności złącza balkon-strop
Influence of steel brackets supporting crane runway girders structure on the stress distribution in the brackets
The paper presents a numerical analysis of steel brackets supporting a double-span crane runway girders. The purpose of the study was to assess the new structural solution based on the stress distribution in the brackets. In order to simplify the connection, the bottom flange of the crane runway girder is based directly on the upper flange of the bracket. As a result, the support reaction is no longer applied in the plane of the bracket web, but it is carried as ununiform pressure. Known analytical methods are not sufficient to assess the level of the bracket material effort due to the mechanism of the forces transmission. That is why the FE analysis was performed. Twisting of the bracket caused by eccentric load (in addition to the biaxial bending) was observed. What is more it occurred that transverse stiffeners in the bracket structure generate high stress.
Building Information Modeling (BIM) is a technology designed to improve and integrate all engineering aspects in the construction design process. Tools that incorporate the idea of BIM are becoming more advanced and also more popular. Available software solutions have already reached an assumable high level of development, but still are not as widespread and used on nearly as many construction projects as could be expected. Therefore the aim of this paper is to show the advantages and limitations of BIM by looking at projects of small and middle sized buildings from the conventional (2D) and BIM approach perspective. The study was based on the present projects executed in Poland and first-hand experience. In addition, the paper also presents a literature review and the results of a survey on the level of knowledge and scope of BIM technology application in Pomerania (Poland). The results of the study indicate that, against common opinion, BIM software is not only useful for large investments, but can also be recommended for the design of small and middle sized buildings. Presented case study reveals, that the use of BIM in smaller projects also provides significant advantages, especially in the context of time consumed for the design process.