PSI - Issue 19

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 19 (2019) 336–345

Fatigue Design 2019 Derivation of a new fatigue class for top flange to web junctions of runway beams Sandro Citarelli a *, Markus Feldmann a Fatigue Design 2019 Derivation of a new fatigue class for top flange to web junctions of runway beams Sandro Citarelli a *, Markus Feldmann a

a Institute of Steel Construction, RWTH Aachen, Mies-van-der-Rohe Str. 1, 52074 Aachen, Germany a Institute of Steel Construction, RWTH Aachen, Mies-van-der-Rohe Str. 1, 52074 Aachen, Germany

Abstract Abstract

In the course of the European standard harmonization the introduction of the Eurocodes in the technical approved area for steel construction led to a significantly more conservative classification regarding fatigue failure, especially for flange to web connections of runway beams in heavy smeltery cranes compared to former design experiences such as from DIN 18800 and DIN 4132. Actually these changes would lead to a doubling of the cross-sectional thicknesses, which e.g. also can result in web plates with extreme thicknesses of 80 mm. Execution as well as monitoring of such flange to web connections using full penetration tee butt welds are quite critical and could no longer be realized economically. Encouraged by the operators of such constructions and crane installations from the metallurgical industry, the aim was therefore to devise an amendment to the correspondent actual fatigue classification in the Eurocode. The basis for these efforts are crane runway girders designed according to the "old standard" and their damage behaviour for the notch detail "concentrated wheel load" at the upper neck weld. Some of these girders have been in use for decades and usually show no damage for this connection type, if the design is suitable according to previous standards. The investigations were accompanied by numerical simulations. The results are closing the experimental gap that has been existing and that so far has been bridged by experience and interpretation of single test results, justifying a modification of the rules in EN 1993-1-9 Table 8.10. In the course of the European standard harmonization the introduction of the Eurocodes in the technical approved rea for steel struction led to a significantly more conservative classification regardin fatigue failure, especially for flange to web connections of runway beams in heavy smeltery cranes compared to former design exp riences such as from DIN 18800 and DIN 4132. Actually these changes would lead to a doubling of the cross-sectional thicknesses, which e.g. also can result in web plat s with extreme thicknesses of 80 mm. Execution as w ll as monitoring of such flange to web connections using full penetration tee butt welds are quite critical and could no longer be realized economically. Encouraged by the operators f such constructions and crane inst llatio s from the m tallurgical industry, the aim was therefore to devise an amen ment to the corr sp ndent actual fatigue classification in the Eurocode. The basis for these efforts ar crane runway girders designe according to the "old standard" and their damage behaviour for the notch etail "concentrated wheel load" at t upper neck weld. Some of these girders h ve been in use for decades and usually show no damage for this connection type, if the desig is suitable according to revious standards. The investig tions were accompanied by num rical simulations. The results are closing the experimental gap that has been existing and that so far has been bridged by experience and interpretation of single test results, justifying a modification of the rules in EN 1993-1-9 Table 8.10.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Keywords: fatigue, fatigue class, concentrated wheel load, crane runway girder; Keywords: fatigue, fatigue class, concentrated wheel load, crane runway girder;

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. * Correspon ing author. Tel.: +49 241 80 25241; fax: +49 241 80 22140. E-mail address: s.citarelli@stb.rwth-aachen.de * Corresponding author. Tel.: +49 241 80 25241; fax: +49 241 80 22140. E-mail address: s.citarelli@stb.rwth-aachen.de

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.037