Abstract
The paper is focused on stability analysis of different models of steel cold-formed C-section column. The analysed element may be applied as a primary load-bearing member in steel trusses or silo columns. The column can be used as a support for a wall of roof plates made of corrugated sheets. The wall sheeting that restrains the column against buckling may be considered as an elastic foundation. Due to the design solutions the foundation may be modelled as a series of lateral translational or rotational elastic supports. Such model is used for example in silo column analysis. In the paper linear bifurcation analysis (LBA) of axially compressed columns with different type of elastic foundation is carried by means of ABAQUS software. The analysed thin-walled column (C 250×100×33×4) is regarded as a load-bearing element in a steel hall. The column was modelled by shell elements, the foundation modelled by means of elastic supports. The column length was 5000 mm. The authors present a 3D image of an influence of lateral translational and rotational elastic supports on the buckling resistance of the column.
Highlights
In modern steel structures cold-formed elements are no longer used only as secondary sections like roof purlins or wall girts
The authors have chosen a thin-wall cross-section that is implemented by an international steel structure manufacturer
Due to the design solutions the foundation may be modelled in the form of lateral translational or rotational elastic supports
Summary
In modern steel structures cold-formed elements are no longer used only as secondary sections like roof purlins or wall girts. The authors have chosen a thin-wall cross-section that is implemented by an international steel structure manufacturer They decided to analyse the elastic foundation influence on a member resistance. Due to the design solutions the foundation may be modelled in the form of lateral translational or rotational elastic supports This approach is well-known in the process of silo column design [5, 7, 9], included in the EC 1993-4-1 [4]. In the case of column restraining by steel sheeting between two other columns (Figure 2b and 2c) the lateral translational and rotational stiffness can be compared to simple computational situations commonly known in structural mechanics as a slope and deflection method (Figure 4). A doubled reaction from two adjacent columns (for displacement or rotation equal to one) can be compared to the steel sheeting stiffness assuming rigid connection to the column
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