Abstract
The paper deals with the influence of initial imperfections and presents fundamental information about experimental and theoretical-numerical research to determinate the load-carrying capacity of thin-walled cold-formed compressed steel members. The investigated members had closed cross-sections made of homogeneous material. The theoretical-numerical analysis in this paper is oriented on the investigation and modeling of initial imperfections effects, caused by production process, on the load-carrying capacities of mentioned members, while the experimental investigation is to verify the theoretical results and to investigate the behavior of mentioned members during the loading process.
Highlights
Theory and design development of steel thin-walled cold-formed members and profiles creates a certain knowledge base for their practical application in the civil engineering
The values of the measured initial imperfections in individual grid points were considered in the 3D models [2]
The condition has been met, the results revealed a serious effect of initial imperfections
Summary
Theory and design development of steel thin-walled cold-formed members and profiles creates a certain knowledge base for their practical application in the civil engineering. This fact does not mean that all the complicated and challenging processes of their behavior, during the strain, transformation and failure are sufficiently investigated. From the material and geometric point of view, the thin-walled cold-formed profiles have specific specialties, which must be responsibly taken into account in their design [1] From this aspect, the local stability requirements related to unfavorable buckling effects of their compressed parts are very significant. Different calculation procedures in different standards (STN 73 1402:1988, STN EN 1993-1-3: 2006), reciprocal comparison of the results and their comparison to with existing experimental results indicate the need for further theoretical and experimental investigation of the post-critical behavior and elastic-plastic resistance of thin-walled profiles
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