Joint moment-rotation characteristic in light of experimental simulations of frame column loss

Aspects related to robustness of steel frameworks with semi-rigid steel and steelconcrete

composite joints are dealt with. Experimental investigations were carried

out for sub-frames fabricated in technical scale. Pushdown tests for steel subframes

simulated the joint ability to transfer the bending moment and axial force

under a column loss scenario. Tests on composite sub-frames were arranged in

two stages. The first one was related to a service stage when the slab was under a

gravity load and the column to be removed supported. The gravity load was

sustained in the second stage when a column loss scenario was simulated.

Experiments have shown that composite flush end-plate joints may not be robust

enough since their low strength under sagging bending, despite of good ductility,

does not allow for the redistribution of internal forces in order to achieve the

equilibrium in the residual state after static column removal. Contrary,

symmetrical steel and composite joints with extended end-plates on both sides of

beam flanges seem to be more robust, despite of their lesser ductility. Robust

bending behaviour is possible because extended end-plate joints exhibit a better

balance between the strength and rotation capacity that allows to achieve the

equilibrium state in case of a static column loss event.

Full text (pdf)

[1] EN 1990. Eurocode: Basis of Structural Design.

[2] EN 1991-1-7. Eurocode 1: Actions on Structures, Part 1-7: Accidental Actions.

[3] Robustness. Chapter 6 in: Steel Buildings in Europe - Multi-Storey Steel Buildings.

Part 4: Detailed design, http://www.arcelormittal.com/sections/index.php?id=167.

[4] Demonceau J.F.: Steel and composite building frames: sway response under

conventional loading and development of membrane effects in beams further to

an exceptional action. PhD Thesis, Universite de Liege, Faculte de Sciences Appliquees.

Annee Academique 2007-2008.

[5] Hai L.N.N.: Structural response of steel and composite building frames further to

an impact leading to the loss of a column. PhD Thesis, Universite de Liege, Faculte

de Sciences Appliquees. Annee Academique 2008-2009.

[6] Menchel K.: Progressive Collapse: Comparison of Main Standards, Formulation and

Validation of New Computational Procedures. PhD Thesis, Universite Libre

de Bruxelles, Faculte de Sciences Appliquees. Annee Academique 2008-2009.

[7] Saleh A.A.K.: Modelling of beam-to-column joint of steel-concrete composite

frames subjected to standard and extreme load combinations. PhD thesis, Warsaw

University of Technology, Warsaw 2013 [in preparation - non-referred publication

of the Warsaw University of Technology Publishing Office].

[8] Kozlowski A., Gizejowski M., Sleczka L., Pisarek Z., Saleh B.: Experimental

investigations of the joint behavior – Robustness assessment of steel and steel-concrete

composite frames. Proceedings of the 6th European Conference on Steel and Composite

Structures, Budapest 2011, vol. A, pp. 339-344.

[9] Giżejowski M., Saleh B., Kozłowski A., Pisarek Z., Ślęczka L.: Experimental

investigations of the frame behaviour subjected to exceptional actions. Zeszyty

naukowe Politechniki Rzeszowskiej, seria Budownictwo i Inżynieria Środowiska,

zeszyt 59, nr3/2012/II, str. 161-168 [in Polish].

[10] Barcewicz W.: Stiffness, strength and rotation capacity of a certain class of joints

in steel structures with composite slabs. PhD thesis, Faculty of Civil Engineering,

Warsaw University of Technology, Warsaw 2010 [in Polish – non-referred

publication of the Warsaw University of Technology Publishing Office].

[11] Giżejowski M., Kwaśniewski L., Balcerzak M.: Numerical modeling of damage for

a tested composite steel-concrete specimen. Proceedings of CMM-2011: Computer

Methods in Mechanics. Minisymposium: Structures under Extreme Actions (organized

by M. Giżejowski and L. Kwaśniewski), Warsaw, 9–12 May, 2011.

[12] Giżejowski M., Kwaśniewski L., Saleh B., Balcerzak M.: Numerical Study of Joint

Behavior for Robustness Assessment. Journal of Applied Mechanics and Materials,

Vols. 166-169, 2012, 3114-3117 [doi:10.4028/www.scientific.net/AMM.166-

169.3114].