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EN
Purpose: Developing structural designs that offer superior vibration properties is still a major challenge, but they stay solid and lightweight simultaneously. Composite faces are frequently used in insulating constructions as an alternative to sheet metal roofs. Rubber overlays have been added to reduce waves' natural frequency and fade time. Design/methodology/approach: The mechanical properties and the natural frequency calculation of the materials that make up the composite structural panels designed for structural applications with the addition of rubber layers were studied in this study. Findings: The results showed the addition of rubber layers with SiO2 nanoparticles with a density of 1180 kg m3, and the optimal decrease (VF = 2.5%) is 38.5% in the natural frequency while at a density of 1210 kg/m3, it is 40.2% in the natural frequency. While the addition of rubber layers with Al2O3 nanoparticles shows a density of 1180 kg/m3, the optimum reduction (VF = 2.5%) is 41% in HF while at a density of 1210 kg/m3 36.8% in an NF 41% during a density of 1210 kg/m3 38.4%. Research limitations/implications: Certain hypotheses were used to apply Kirchhoff's theory to solve the mathematical model of the structure. Practical implications: The work was carried out on the faces of nanocomposites made of SiO2/epoxy and Al2O3/epoxy with different densities and polylactic acid core. The inclusion of nanoparticles as a percentage of the fraction size ranges from 0% to 2.50%. Originality/value: This study's results shed light on the fundamental behaviour of the components that make up the sandwich in the presence of rubber layers.
2
Content available remote Stabilizująca rola paneli warstwowych w nośności belek. Sztywność postaciowa
PL
Panele warstwowe są obiektami konstrukcyjnymi, które służą nie tylko do przenoszenia obciążeń na podkonstrukcję, ale również mogą zostać wykorzystane jako bardzo odpowiedzialny element konstrukcyjny, którego zadaniem jest stabilizacja elementów ściskanych lub zginanych. Mogą pełnić rolę ciągłego stężenia poprzecznego lub przeciwskrętnego. W pracy przedstawiono podstawowe zasady wynikające z takiej współpracy. Z uwagi na złożoność i obszerność zagadnienia skupiono się na sztywności postaciowej tego typu poszycia.
EN
Sandwich panels are structures that not only are designed to transfer loads to the substructure, but can also be used as a very responsible structural element whose role is to stabilize elements subjected to compressionor bending. They can be treated as a continuous transverse shear or rotational restraints. The paper presents basic principles resulting from such a co-action. Due to the complexity and broadness of the issue, the focus is on the shear stiffness of this type of covering.
3
Content available remote Cyclic testing of steel frames infilled with concrete sandwich panels
EN
In-plane seismic behaviour of concrete sandwich panel-infilled steel frame (CSP-ISF) was experimentally and numerically investigated. Four large-scale, single bay and single story steel frame specimens were tested under reversed cyclic lateral loading. Three infilled frames with different aspect ratios along with one bare frame were considered. It was found that addition of sandwich panels leads to considerable increase in the lateral stiffness and strength, ductility, energy dissipation capacity as well as equivalent viscous damping ratio of the steel frames. Furthermore, the maximum shear capacity of CSP-ISF specimens was validated by analytical approaches which showed good agreement with experimental results. Based on the present experiments, structural performance levels required for Performance-based Analysis are also proposed for concrete sandwich panel used as infill walls. Finally, a numerical model is presented to analyze the nonlinear behaviour of CSP-ISFs.
EN
The paper presents numerical simulations of the behavior of sandwich panels loaded by static concentrated force. Two model classes (2D and 3D) are considered, and the results are compared with the effective width method. The comparison mainly concerns the displacements and stresses in the facings. The obtained results indicate the areas of conformity between the models but also show significant differences between them. The observed local effects are discussed and the surprising location of extreme stress in the facings is demonstrated.
PL
W artykule przedstawiono badania nośności pośrednich połączeń paneli warstwowych z ryglami ściennymi, w których zastosowano łączniki śrubowe, oraz połączeń paneli warstwowych z konstrukcją wsporczą, zrealizowanych za pomocą śrub zamkowych lub wkrętów. Określono obciążenia graniczne, przy którym następuje zniszczenie połączenia, oraz ustalono nośności z warunku użytkowalności.
EN
The article presents load-bearing capacity tests of interim sandwich panel/wall beam joints with bolted fixtures, as well as sandwich panel/support structure joints with lock screws or regular screws. Limit loads are determined for joint damage and load-bearing capacity values were determined for the usability requirement.
PL
W artykule omówiono problem dobierania paneli na podstawie katalogów oraz zasady projektowania płyt i połączeń bezpośrednich paneli warstwowych z konstrukcją wsporczą. Przedstawiono analizy statyczne i parametryczne, zasady obliczania obciążeń połączeń oraz projektowania z warunku zniszczenia i użytkowania.
EN
The article discusses the issue of panel selection on the basis of product catalogs, and the principles of designing panels and joints between sandwich panels and supporting structure. Static and dimensioning analysis, joint load and design calculations are presented in terms of damage and usage criteria.
7
Content available remote Właściwości akustyczne lekkich układów warstwowych
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