This paper investigates the mechanical properties of a new type of sandwich composite panel composed of two steel faces and a phenolic foam core under uniformly distributed load. Two groups of full-scale phenolic foam sandwich panels, which are classified as thin faced wall panels and thick faced roof panels, are tested by vacuum chamber loading method. The general formulae for calculating deformation and load bearing capacity are derived from the force-deformation relationships of differential equations, where the calculation of thin faced sandwich panels can be regarded as a special case of thick faced sandwich panels. Based on these formulae, the bending moment partition coefficient and shear partition coefficient are given for simplified calculation in design. The finite element method with software ABAQUS is used to verify the results from theoretical formulae and tests. By comparing these results, a good agreement is obtained. The sensitivity analyses show that the thin faced wall panels are very sensitive to initial geometrical imperfection, whereas the thick faced roof panels are not.
This paper investigates the buckling properties of a new building sandwich composite panel composed of two fiberreinforced calcium silicate faces and a formed polyurethane core material. In order to predict the global buckling load of sandwich panels subjected to axial loads, the buckling formulae are theoretically derived and suggested in design. Using the method of effective length factor, both buckling formulae for fixed-fixed sandwich panel and hinged-hinged one are unified into the same form. The buckling formulae are verified by axial load tests, finite element (FE) software ABAQUS. Comparing the theoretical formula derived with FE modeling results, a good agreement is obtained and this illustrates the accuracy of the unified formula. To analyze the influence of both geometrical and material parameters on the buckling load, a sensitivity analysis is conducted. The results show that boundary condition, length, and total thickness have large influence on buckling load. The core shear modulus has large influence on buckling load of short sandwich panels and this influence becomes less important with the increasing length. The accuracy degree of theoretical result in hinged condition is mainly affected by length and initial geometric imperfection. The variation of core shear modulus has little effect on error.
A new in-filled wall is used in assembled steel structure buildings, which consists of two layers of glass fiber reinforced concrete (GRC) panels and a built-in light steel skeleton frame. To make this new wall fill in the main steel structure, a new in-filled bolt joint is used. In order to obtain the mechanical properties and failure modes under shear load, the shear performances of this joint were studied with the finite element (FE) software ABAQUS. The results show that before reaching the fracture failure strain, the in-filled bolt joint shows good elastic-plastic behaviour. When the strain of the in-filled bolt joint reaches the failure strain, the shear load reaches the peak value. Subsequently, due to the shear fracture of the bolt, the shear load drops rapidly. Throughout the loading process, the stress of steel beam and rectangular steel tube is always very small and the stress of the joint yields in a large area in the later stage.
Metal faced sandwich panel is composed of two relatively high strength metal faces and a relatively thick and lightweight insulated core. Under the continuous action of temperature such as strong sunlight, the multi-span metal faced sandwich panels can be destroyed. In this paper, the finite element (FE) software ABAQUS was used to study the stress and deformation of these sandwich panels under temperature action. The FE results show that the compressive stress in the mid-span region of the metal panel is larger and it gradually decreased from the middle to the two sides. The deformation at the centre of side span of sandwich panels is larger. The support constraints at the bottom of the sandwich panel have a great influence on the temperature stress. The fixed sandwich panel is more likely to occur wrinkle failure than the hinged one. To reduce the effects of temperature, two effective methods are proposed. The method increasing the density of the core material can increase the buckling stress and improve the bearing capacity against temperature action. The other method reducing the length of each segment of the sandwich panel can effectively release the temperature stress and reduce the negative effects of temperature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.