Design of high-strength steel tubular structures
Kierros, Miro (2017)
2017
Rakennustekniikka
Talouden ja rakentamisen tiedekunta - Faculty of Business and Built Environment
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Hyväksymispäivämäärä
2017-11-08
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201710252065
https://urn.fi/URN:NBN:fi:tty-201710252065
Tiivistelmä
This Master of Science thesis investigates the usage of high-strength steels in tubular structures. High-strength steels are not so familiar for designers even if Eurocode EN 1993-1-12 presents design rules for steel grades greater than S460 up to S700. This thesis comprises the design of structural hollow sections in trusses. Chapters include structural analysis types, the design of the joints and members, cost functions and the design of Warren-type trussed portal frame. Some examples are presented to illustrate the design of high-strength steel structures.
New research studies about design rules of high-strength steels are presented in this thesis. New rules are used in examples. EN 1992-1-12 has reduction factors for the design of welded joints between tubular members. A recent study has shown that these reduction factors could be higher. In the same study, it has been found out that better buckling curves can be used for high-strength steels. There are also new rules for the usage of the weld when the design of the weld is based on the affecting force or the resistance of the weld. New classification limits for width-to-thickness ratios and a new procedure of the resistance of the cross-sections are presented in recent studies.
Thesis clarifies benefits of high-strength steels and presents new design rules. New rules are presented in literature in the trade and benefits are described with calculation examples. Eurocode requirements for high-strength steels are adapted to this thesis.
New research studies about design rules of high-strength steels are presented in this thesis. New rules are used in examples. EN 1992-1-12 has reduction factors for the design of welded joints between tubular members. A recent study has shown that these reduction factors could be higher. In the same study, it has been found out that better buckling curves can be used for high-strength steels. There are also new rules for the usage of the weld when the design of the weld is based on the affecting force or the resistance of the weld. New classification limits for width-to-thickness ratios and a new procedure of the resistance of the cross-sections are presented in recent studies.
Thesis clarifies benefits of high-strength steels and presents new design rules. New rules are presented in literature in the trade and benefits are described with calculation examples. Eurocode requirements for high-strength steels are adapted to this thesis.