Breathing-induced fatigue in thin-walled construction. The way to check it

0431715 - ÚTAM 2015 RIV BE eng C - Konferenční příspěvek (zahraniční konf.)
Škaloud, Miroslav - Zörnerová, Marie - Urushadze, Shota
Breathing-induced fatigue in thin-walled construction. The way to check it.
Eurosteel2014. 7th european conference on steel and composite structures. Brusel: ECCS European Convention for Constructional Steelwork, 2014 - (Landolfo, R.; Mazzolani, F.). ISBN 978-92-9147-121-8.
[Eurosteel 2014. Conference on Steel and Composite Structures /7./. Neapol (IT), 10.09.2014-12.09.2014]
Grant CEP: GA ČR(CZ) GC13-34405J
Grant ostatní: National Science Council of Taiwan(TW) 101WFD 0400131
Institucionální podpora: RVO:68378297
Klíčová slova: breathing phenomenom * thin-walled steel girders * fatigue
Kód oboru RIV: JM - Inženýrské stavitelství
file:///S:/Archiv/Konferencni_sborniky/EUROSTEEL7_2014-09-10-12_Napoli/papers/03/42-452.pdf

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. It was found out that the above phenomenon led to a significant "erosion" of the beneficial post-buckled reserve of strength, so characteristic of the performance of thin-walled construction under the action of quasiconstant loading. Therefore, S-N curves were established for (i) the fatigue limit state (determining the maximum load range that the girder can sustain) and (ii) the onset-of-the-first-fatigue-crack limit state, which specifies those periods, given by the number of loading cycles, after which a check of the plate elements of the bridge for the appearance of fatigue cracks needs to be carried out.
Trvalý link: http://hdl.handle.net/11104/0236297