Abstract
The increasing use of light steel thin-walled structures is determined by the efficiency of the production of cold-formed profiles. However, there are problems of calculating the reliability of thin-walled structures. In particular, it is necessary to specify the calculation of the generalized bearing capacity of an element from a thin-walled profile. Such an element is significantly affected by the initial geometric imperfections reducing its bearing capacity. At the same time the element is influenced by an uneven distribution of the mechanical characteristics of the steel over the section of the profile. A thin-walled element of paired sigma profiles with a section height of 300 mm was taken as the object of study. This paper presents the results of the calculation of the effective characteristics of a thin-walled profile operating under axial compression with bending without and with the initial geometric imperfections (additional eccentricity from the element’s initial curvatures). Besides, the paper reveals the results of laboratory studies of the distribution of the mechanical properties of steel over the cross section of a thin-walled profile after using direct and indirect test methods.
Highlights
The demand for a correct assessment of the reliability of building structures and the use of effective design solutions is justified by a number of reasons
The calculation of the effective geometric characteristics of the section showed (Table 2) a significant effect of the initial geometric imperfections, a reduction of the cross section area occurs by 16 and 25% respectively for cases 1 and 2 in comparison with the case that does not take into account the initial geometric imperfections
The increase in stresses occurs due to the loss of local stability of individual elements of the cross section, and the elastoplastic work of the material occurs when the stresses in the total cross section are equal to 0.71 Ry
Summary
The demand for a correct assessment of the reliability of building structures and the use of effective design solutions is justified by a number of reasons. The main of them is to ensure the bearing capacity and reduce the risk of failure of structures. This factor is directly related to high safety margins, which are often economically disadvantageous. Light steel thin-walled structures (CFS) are structures manufactured from cold-rolled thin-sheet (0.6 ÷ 3 mm) steel by cold bending on rolling mills with subsequent galvanizing. The structures erected from CFS are light skeletons, the frames of which are interconnected into a spatial system. Paired profiles are most frequently used as the main bearing elements of the frame of CFS. The paired profiles are interconnected in a symmetrical section with bolts, self-tapping screws, and rivets
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