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1
Content available Performance Assessment of Steel Moment Connections Retrofitted With Various Reduced Section Patterns
Sivandi-Pour Abbas
Civil and Environmental Engineering Reports
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2019
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Vol. 29, no. 4
1--17
EN
It is of high importance in seismic retrofitting of lateral load-bearing systems to increase the connections performance. The crucial point in the steel frame retrofitting process is to create plastic hinges in these types of frames. The formation of plastic hinges in beams and near columns generates large strains on column flanges as well as welding metal and heated surroundings, which can lead to brittle failure. The connection should be designed in such a way as to allow plastic hinge formation at certain points of the beam. One such method suggested for retrofit connections is to reduce the beam section locally away from the connection zone. There are various patterns available to locally reduce the beam section, such as circular, elliptical, and symmetric/asymmetric. In recent years, different proposals have been presented to design these connections which vary from older instructions. For this study, radiused cuts in the flange and slotted holes in the web of connection beams were selected for retrofitting analysis. Cyclic behavior, energy damping levels, and ductility of these connections were studied and compared before and after the retrofit by using nonlinear dynamic analysis. The results showed that the symmetrical circular hole pattern in the beam flanges demonstrated reliable performance.
2
Content available remote New Gasostatic Borehole Bearings - Construction and Research
Oryński F., Pawłowski W., Kawczyński S.
Mechanics and Mechanical Engineering
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2016
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Vol. 20, nr 1
33--41
EN
In the article the origin of creation, construction as well as the research of the novel gasostatic borehole bearings are presented. In the rst part of the paper the information on the construction of the bearing is outlined whereas in the second part the methodology of the experimental and numerical research as well as obtained results are described. The paper is summarized with the conclusions of the research and suggestions due to commercial application of the bearings.
3
Przekroje kabli pracujących w systemach bezpieczeństwa
Sosnowski I.
Wiadomości Elektrotechniczne
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2009
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R. 77, nr 8
42-44
PL
Omówiono wymagania normy DIN4102 cz. 12 dotyczących kabli i ich systemu nośnego, stosowanych w systemach bezpieczeństwa.
EN
The paper discusses DIN4102, part 12 standard requirements for cables and their carrying systems applied in safety systems.
4
Systemy PERI w budownictwie i remontach obiektów mostowych
Rzepka J., Szpila J.
Inżynieria i Budownictwo
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2002
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R. 58, nr 9
469-472
PL
Omówiono rozwiązania systemowe deskowań i rusztowań PERI, stosowanych w mostownictwie, a także zakresy ich wykorzystania w praktyce inżynierskiej. Zwrócono uwagę na zalety tych deskowań i rusztowań.
EN
Scaffold and formwork Peri systems and their broad application possibilities in engineering practice are presented.
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