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The "miracle" of post-buckled behaviour in thin-walled steel construction and some limitations to its full exploitation
Škaloud, Miroslav ; Zörnerová, Marie
Thin-walled steel structures, i.e. structural systems made of thin (usually plate) elements, represent a powerful tool for increasing the competitiveness of steel construction. Then, on the other side, it is in the nature of things that the limit state of the systém is in the danger of being substantially reduced by stability phenomena. Fortunately, the situation is remedied by the beneficial effect of post-buckled (post-critical) behaviour, which is in detail described and "mapped" in the contribution. However, attention is also turned to some limitations which in some cases hinder a full exploitation of the phenomenon, one of them, viz. the unavoidable reduction of the post-buckled reserve of strength due to breathing-induced fatigue, being described in detail in the paper
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Breathing-induced fatigue in thin-walled steel bridge construction
Škaloud, Miroslav ; Zörnerová, Marie ; Urushadze, Shota
Several years ago, the authors started an experimental investigation into the breathing phenomenon of the webs of thin-walled steel girders , which to date comprised more than two hundred tests. The cumulative damage behaviour generated by web breathing was analysed, the process of the initiation and propagation of fatigue cracks induced thereby was studied, and their impact on the failure mechanism and the fatigue limit state of the girders was determined. And, to conclude, a recommendation for design, taking account of the aforesaid, was established.
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