Local Buckling Influence on the Moment Redistribution Coefficient for Composite Continuous Beams of Bridges

Samy Guezouli, Mohammed Hjiaj, Nguyen Quang Huy


The present paper is concerned with the elastic design optimisation of continuous composite beams. This optimisation is based on the analysis of the beam in the inelastic range including the concrete creep and shrinkage, the tension stiffening and temperature difference effects as well as the possible local buckling instability. The finite element program PONTMIXTE (adapted to study continuous beams at real scale with short time computation) is first presented with its different sections: Pre-design (in accordance with Eurocode specifications), Non linear finite element calculation and Post-processing. In order to validate the proposed model, the numerical calculations are compared against experimental results from tests on a two-span beam in reduced scale (7.5 m length for each span) without taking into account the local buckling phenomenon avoided in the experimental test by using web-stiffeners. Next, special attention is paid to study the influence of the local buckling instability on the internal moment redistribution coefficient between hogging and sagging zones. The application concerns different 3-span beams of bridge at real scale with medium span lengths (40–60–40 m). The post-buckling behaviour represented by moment-rotation curves (M-θ) is deduced from a 3D finite element model of the cross-section developed using Castem finite element code. The M-θ curves describing the local buckling phenomenon are approximated using hyperbolic functions and implemented in PONTMIXTE using a specific rotational spring finite element. The influence of this instability on the moment redistribution coefficients calls the Standart predictions into question.


Eurocode; bridges; finite element model (FEM); composite beams; local buckling; moment redistribution

Full Text:



Brozzetti, J. 2000. Design Development of Steel-Concrete Composite Bridges in France, Journal of Constructional Steel Research 55(1–3): 229–243. doi:10.1016/S0143-974X(99)00087-5

Chung, W.; Sotelino, E. D. 2006. Three-Dimensional Finite Element Modeling of Composite Girder Bridges, Engineering Structures 28(1): 63–71. doi:10.1016/j.engstruct.2005.05.019

Davies, G.; Mandal, S. N. 1979. The Collapse Behavior of Tapered Plate Girders Loaded within the Tip, Ice Proceedings 67(1): 65–80. doi:10.1680/iicep.1979.2317

Faella, C.; Martinelli, E.; Nigro, E. 2002. Steel and Concrete Composite Beams with Flexible Shear Connection: “Exact” Analytical Expression of the Stiffness Matrix and Applications, Computers and Structures 80(11): 1001–1009. doi:10.1016/S0045-7949(02)00038-X

Guezouli, S.; Hjiaj, M.; Nguyen, Q. H. 2008. 3-D F. E. Connection Degree in Composite Continuous Beams – Influence on the Bending Moment Capacity, in The 5th European Conference on Steel and Composite Structures (Eurosteel 2008). Ed. by Ofner, R.; Beg, D.; Fink, J.; Greiner, R.; Unterweger, H. September 3–5, 2008, Graz, Austria.

Guezouli, S.; Yabuki, T. 2008. Numerical Investigation on Instabilities of Steel-Concrete Composite Cross-Sections, in Proc of the 5th International Conference on Thin-Walled Structures, vol. 2. June 18–20, 2008. Brisbane, Australia, 1007–1014.

Guezouli, S. 2007. Local Buckling of Class 4 Cross-Section – Application to a Steel-Concrete Continuous Beam of Bridge at Real Scale, in Proc of 3rd International Conference on Steel and Composite Structures (ICSCS’07). 30 July – 1 August, 2007, Manchester, UK. Manchester, 481–487.

Guezouli, S.; Yabuki, T. 2006. “Pontmixte”: a User Friendly Program for Continuous Beams of Composite Bridges, in Proc of the International Colloquium on Stability and Ductility of Steel Structures (SDSS’06). September 6–8, 2006, Lisbon, Portugal.

Guezouli, S.; Aribert, J. M. 2004. Numerical Investigation of Moment Redistribution in Continuous Beams of Composite Bridges, in Proc of the Composite Construction in Steel and Concrete V. Ed. by Leon, T. R.; Lange, J. Kruger National Park, South Africa. American Society of Civil Engineers, 47–56. doi:10.1061/40826(186)5

Guezouli, S.; Aribert, J. M. 2001. Approche aux éléments finis pour l’étude du comportement des poutres de ponts mixtes à l’échelle réelle, in XVème Congrès Français de Mécanique [XVth French Symposium of Mechanics]. September 3–7, 2001, Nancy, France.

Nguyen, Q. H.; Hjiaj, M.; Uy, B.; Guezouli, S. 2008. Nonlinear F. E. Analysis of Composite Beams, in Proc of the 5th European Conference on Steel and Composite Structures (Eurosteel 2008). Ed. by Ofner, R.; Beg, D.; Fink, J.; Greiner, R.; Unterweger, H. September 3–5, 2008, Graz, Austria. Brussels: ECCS European Convention for Constructional Steelwork, 405–410.

Porter, D. M.; Rokey, K. C.; Evans, H. R. 1975. The Collapse Behavior of Plate Girders Loaded in Shear, Journal of Structural Engineering 53(8): 313–325.

Shanmugam, N. E.; Wan Mohtar, W. H. M. 2007. Experimental and Finite Element Studies on Tapered Steel Plate Girders, in Proc of the International Conference on Computational Science 2007 (ICSCS-2007). 30 July – 1 August, 2007, Manchester, UK. Manchester, 165–170.

Škaloud, M.; Zörnerova; M. 2005. The Fatigue Behaviour of the Breathing Webs of Steel Bridge Girders, Journal of Civil Engineering and Management 11(4): 323–336.

Škaloud, M.; Rokey, K. C. 1972. The Ultimate Load Behaviour of Plate Girders Loaded in Shear, Journal of Structural Engineering 50(1): 29–47.

Žilinskaitė, A.; Žiliukas, A. 2009. Buckling of Double-T Construction Elements for Bridges in Case of Complicated Loading, The Baltic Journal of Road and Bridge Engineering 4(1): 27–30. doi:10.3846/1822-427X.2009.4.27-30

DOI: 10.3846/bjrbe.2010.29


  • There are currently no refbacks.

Copyright (c) 2010 Vilnius Gediminas Technical University (VGTU) Press Technika