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Zwiększenie izolacyjności termicznej budynków z elewacją kamienną na ruszcie stalowym

Jasiczak Józef, Kanoniczak Marcin

Materiały Budowlane

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2021

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nr 4

20--22

PL

Zaostrzanie przepisów dotyczących izolacyjności termicznej ścian zewnętrznych budynków przeznaczonych na stały pobyt ludzi w wielu przypadkach istniejących obiektów stwarza problemy z dotosowaniem przegród do nowych wymagań. Dotyczy to m.in. ścian zewnętrznych z elewacją wentylowaną z okładziną z płyt kamiennych na ruszcie stalowym przymocowanym do konstrukcji ściany. W artykule przanalizowano zastosowanie różnych rozwiązań materiałowych w celu dostosowania ściany z tego typu elewacją wykonaną w latach 90. XX w. do wymagań określonych w warunkach technicznych obowiązujących od 31 grudnia 2020 r. (WT 2021).

EN

Strengthened regulations on thermal insulation of external walls of buildings intended for permanent residence of people in many cases creates problems with adapting to new requirements. A specific case is external walls with a ventilated facade stone slab cladding on a steel grate attached to the wall structure. The article analyzes the use of various material solutions so that a wall with this type of façade, made in the 1990s, of XX th century meets the requirements defined in the technical specifications, which are in force from 31 December 2020 (WT 2021).

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Point Protection of Primary Beams of Steel Grillages Against Lateral Torsional Buckling

Piotrowski Rafał, Siedlecka Monika

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 3

1--8

EN

The paper deals with the analysis of lateral torsional buckling (LTB) of steel beams that are components of grillages. Such structures are constructed from primary substring beams and secondary coupling beams. One of the functions performed by secondary beams in grillages is point protection of primary beams against overall stability failure. Based on the LTB analysis of primary beams, the condition specified in the code PN-EN 1993-1-1 (EC-3) was verified. The condition concerns the maximum spacing of point lateral bracings that stabilise compression flanges of beams. Critical moments of LTB for those beams were determined employing two methods. The first method involved the use of equivalent (simplified) loading diagram and the author-developed analytic formula. The other method employed LTBeamN and Abaqus (FEM) software, in which the whole beam was modelled together with bracings. Beam loading diagrams most frequently used in engineering practice were taken into account. Coefficients of LTB were determined in accordance with EC-3. A good congruence of results was obtained, which confirmed the correctness of the equivalent (simplified) beam loading diagram. The condition specified in the code PN-EN 1993-1-1 (EC-3) was also confirmed.

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Optimihzacihja metalevoji balochnoji klihtki

Peleshko I., Jurchenko V.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2000

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z. 32[180], cz.1

395-400

EN

This paper presents an optimum computer-aided design of the I-beam grillage with metal plate flooring. The optimal design task is formulated as a nonlinear programming task. Components of the designing variable vector are structural connection coordinates of the I-beam grillage elements, their cross section parameters and thicknesses of flooring. Constraint system describes the regulation bounding conditions of the steel frame calculating. A purpose function is theoretical weight of the I-beam grillage. To solution of the optimization problem a method of unorthogonal projection of the purpose function gradient is used. Static analysis of the structure is executed with using finite element method at every step of the iterative process.