Reference : Particularities for plastic design of composite beams with deep plastic neutral axis

	Document type :	Scientific congresses, symposiums and conference proceedings : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	Focus Areas :	Physics and Materials Science
	To cite this reference:	http://hdl.handle.net/10993/37347

Title :	Particularities for plastic design of composite beams with deep plastic neutral axis
Language :	English
Author, co-author :	Schäfer, Markus [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
	Zhang, Qingjie [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Publication date :	4-Sep-2018
Main document title :	12th Japanese-German Bridge Symposium
Publisher :	Universität der Bundeswehr
Pages :	10
Peer reviewed :	Yes
On invitation :	Yes
Audience :	International
City :	Munich
Country :	Germany
Event name :	12th Japanese-German Bridge Symposium
Event date :	from 04-09-2018 to 06-09-2018
Event organizer :	TU Munich / University of the Army Munich
Event place (city) :	Munich
Event country :	Germany
Keywords :	[en] Composite Structures ; Plastic BEnding ; composite beams
Abstract :	[en] The demand for sustainable constructions increases the importance of composite structures as they lead to slim and economical solutions with a low self-weight of the structure. The determination of the moment resistance for composite beams follows the rules stated in EN 1994-1-1. Based on the slenderness c/t of the compressed parts of the steel-section, composite cross-sections are classified into four cross-section classes. This classification indirectly reflects the rotation capacity and susceptibility to local buckling. For class 1 and 2 cross-sections, the plastic moment resistance of the crosssection may be considered. Otherwise, an elastic design (for class 3) or an elastic design considering local buckling effects (for class 4) is necessary. If the plastic resistance of the cross-section is assumed, it is considered that each cross-section fibre may plastify without limitation of the strain values. For normal composite beams subjected to the sagging moments and with a high plastic neutral axis, the real moment resistance is quite greater than one obtained by the method of the plastic design. For sections with a large compression zone, xpl, a concrete failure in the compression zone can happen before the plastic moment resistance of the composite cross-section, Mpl,Rd, is reached. Strain limit design, therefore, becomes critical. EN 1994-1-1 provides a limitation of the plastic design resistance only for sections with steel grades S420 and S460. However, there is no guidance given for lower steel grades or the determination of the corresponding concrete compression force. This paper points out, that the rotation capacity of a composite section is dependent on the slenderness of steel crosssection parts and on the behaviour of the concrete part. A comparison of plastic and strain limited moment resistances as well as the analysis of partial shear diagram-based strain limited design results in new findings for the limits of plastic design methods.
Permalink :	http://hdl.handle.net/10993/37347

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