Eurpean Mandate M515, CEN/TC250/SC4.T6 - Background Documents for prEN 1994-1-1

Report (2022)

Background Documents for prEN 1994-1-1

Limitations of plastic bending resistance for composite beams deviated from strain-limitation

in Journal of Constructional Steel Research (2021), 180(106562),

Due to the demand for sustainable constructions, composite structures have become more important and lead to slim and economic solutions with a low structural self-weight. EN 1994-1-1 distinguishes ... [more ▼]

Due to the demand for sustainable constructions, composite structures have become more important and lead to slim and economic solutions with a low structural self-weight. EN 1994-1-1 distinguishes between four different cross-section classes for the determination of moment resistance. For the plastic moment resistance, it is assumed, that each cross-sectional fibre can plastify without any limit on the strain. For standard composite beams with sagging moments and a high plastic neutral axis, plastic resistance and strain-limited resistance give similar results. For sections with a large compression zone height xpl and limited rotation capacity, concrete failure in the compression zone can occur before the plastic moment resistance Mpl,Rd, is reached. The strain limit design becomes critical. This paper points out the impact of the concrete part on the design of composite beams. A parametric study comparing plastic and strain limited moment resistance of a considerable variety of cross-sections has been carried out to develop the beam design methods considering compression zone height for the next generation of Eurocodes. [less ▲]

PLASTIC DESIGN FOR COMPOSITE BEAMS - ARE THERE ANY LIMITS?

in Proceedings of the 9th International Conference on Steel and Aluminium Structures ICSAS19 (2019, July)

Due to the demand for sustainable constructions, composite structures have become more important and lead to slim and economic solutions with a low structural self-weight. EN 1994-1-1 differentiate four ... [more ▼]

Due to the demand for sustainable constructions, composite structures have become more important and lead to slim and economic solutions with a low structural self-weight. EN 1994-1-1 differentiate four different cross-section classes for the determination of moment resistance. For the plastic design of the moment resistance it is assumed, that each cross-sectional fibre can plastify without any limitation of the strains. For standard composite beams in case of sagging moments and a high-lying plastic neutral axis, plastic design and strain-limited design give similar results. In the case of sections with a large compression zone height xpl and limited rotation capacity, a concrete failure in the compression zone can occur before the plastic moment resistance Mpl,Rd, is reached. The strain limit design becomes decisive. This paper points out the impact of the concrete part on the design of composite beams. A parametric study comparing plastic and strain limited moment resistance of a considerable variety of cross-sections has been carried out to develop the beam design methods considering high compression zone height of next generation of Eurocodes. [less ▲]

CEN/TC250/SC4.T1: Second Generation of Eurocode 4: Introduction and Amendments to Final Draft October 2017

Report (2017)

Development of second Generation of Eurocode 4, Projectteam CEN/TC250/SC4/T1, Reports for final Draft October 2017

Background Report to EN 1994 - Plastic moment resistance of composite beams

Report (2017)

As part of the development of the second generation of Eurocodes and harmonization of the different European Codes, some clarifications deal with the design value of concrete compression strength and the ... [more ▼]

As part of the development of the second generation of Eurocodes and harmonization of the different European Codes, some clarifications deal with the design value of concrete compression strength and the bending design of steel-composite sections. The following background document describes the issues in design and confusions between Eurocode 2 for the design of concrete structures and Eurocode 4 for the design of composite structures in steel and concrete. The first part is concentrated on the background information and the accentuation of limits for plastic bending design. While the second part represents the results of multiple comparisons between plastic and strain limited design leading to a new design approach. [less ▲]

CEN/TC250/SC4.T1:Assessment of the systematic review for Eurocode 4 by Projectteam SC4.T1

Report (2016)

Development of second Generation of Eurocode 4, Projetcteam CEN/TC250/SC4/T1, Comments and Assemenent of review from Industries to EN 1994-1-1, EN 1994-1-2, EN 1994-2