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In traditional orthotropic plates the trapezoidal longitudinal stiffener is welded to the transverse girder web and to the bottom flange of the main girder. In a recently developed orthotropic plate the stiffeners and the transverse girder web are not connected. This approach provides for a significant reduction in the amount of flame cutting and welding, but more importantly there is no longer a need to assess the fatigue condition of the weld between the stiffener and the web. On the other hand, the potential for local buckling of the free edge of the web near the trapezoidal stiffener must be considered.

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. Buckling mode as an imperfection in arch structures , Pollack Periodica , Vol. 8 , No. 2 , 2013 , pp. 29 – 40 . [5] Saal H. , Misiek T

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Nowadays the most modern and economical bridges are designed as composite structures with orthotropic plates. In a traditionally designed composite bridge the trapezoidal, longitudinal stiffener is attached, welded to the cross girder web and to the bottom flange of the main girder. However in recent composite bridges with orthotropic plates designed by the UVATERV Co. the cross girder web and the trapezoidal, longitudinal stiffeners are not connected. This is a very important improvement, since in this way the amount of cutting and welding work can be reduced, however more importantly there is no need to consider the fatigue of the welds between the longitudinal stiffener and the cross girder web. On the other hand the disadvantage of this design that the plate-buckling phenomenon of the free edge must be taken into account. This paper studies the new orthotropic plate by the experimental tests.

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Onesteel Australian Tube Mills (OATM), made of two torsionally rigid hollow flanges and a slender web [ 1 ]. Fig. 1. Left: LiteSteel beams [ 1 ], right: Geometry of the tested section, on the basis of [ 2 ] The study of buckling is important and necessary

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Climenhaga J. J., Johnson R. P. Moment-rotation curves for locally buckling beams, Journal of Structural Division , Vol. 50, ST 9, 1972, pp. 1239–1254. Johnson R. P. Moment-rotation curves

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plate buckling, (In Hungarian). DSc Thesis , Hungarian Academy of Sciences, Budapest, 1983. Ivanyi M. DSc Thesis 1983

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) [2] Buckling strength of shells , Recommended Practice DNV-RP-C202, Det Norske Veritas , 2002 . [3] Farkas J

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1209 1223 Gomez-Garcıa J., Marsolek J., Reimerdes H. G. Determination of the energy absorption of cylindrical shells under axial loading by analysis of the dynamic buckling and

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] Ouadiaa M. , Abdellatif K. Reliability analysis of dynamic buckling stiffened panels , Procedia Technology , Vol. 22 , 2016 , pp. 139 – 145 .

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] Khemis A. , Hacene-Chaouche A. , Athmani A. , Tee K. F. Uncertainty effects of soil and structural properties on the buckling of flexible pipes shallowly buried in Winkler foundation , Structural Engineering

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