Abstract
The objective of the paper is to analyze the influence of initial imperfections on the behaviour of thin‐walled girders welded of slender plate elements. In parallel with experiments, one of the ultimate load tests was computer modelled. In so doing, the girder was modelled, using the geometrically and materially non‐linear variant of the shell finite element method, by the ANSYS program. The shape changing during loading process is often accompanying with sudden “snap‐through” i. e. rapid curvature change.
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