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Experimental behaviour of plate girders in steel – Internal forces in intermediate transverse stiffeners
Highlights Experimental shear behaviour of thin-walled plate girders in what concerns shear loading past ultimate loading. Background on the current design approach is documented. Data acquisition techniques are resumed regarding material characteristics measurements using optical extensometer, plate scanning using laser measurements, residual stresses assessment, experimental elastic critical shear buckling load calculation. Two key parameters were investigated: web aspect ratio and transverse stiffener layout, corresponding to 8 tested specimens. Obtained experimental outcomes are compared to current recommendations provided by EN1993-1-5 to design the intermediate transverse stiffener, which are proven experimentally to be very conservative for the design of plate girders.
Abstract Economical design of steel plate girders usually adopts slender web panels sometimes combined with large panel aspect ratio, which determines the elastic stability of the web panel. The adoption of transverse stiffeners is one efficient strategy to retard the web buckling due to shear. The primary role of intermediate transverse stiffener is clear: divide the web into panels providing lateral support to the web plate along the span – This increases the shear strength of the web. However, FprEN 1993-1-5: 2022 stiffener design approach is based mainly on direct compressive forces resulting from the tension filed action in post buckling phase. According to multiple investigations, this area requirement is much higher than that found in laboratory testing and numerical simulations. The findings of experimental testing on eight plate girders with thin webs and two configurations of transverse stiffeners under ultimate load are presented. Using the web and stiffener measure strains, the internal stiffener forces are calculated past the shear failure of the plate girders. These results show that the axial compression and bending moment measured in the intermediate transverse stiffeners are considerably lower than those specified for the design by the FprEN 1993-1-5: 2022 .
Experimental behaviour of plate girders in steel – Internal forces in intermediate transverse stiffeners
Highlights Experimental shear behaviour of thin-walled plate girders in what concerns shear loading past ultimate loading. Background on the current design approach is documented. Data acquisition techniques are resumed regarding material characteristics measurements using optical extensometer, plate scanning using laser measurements, residual stresses assessment, experimental elastic critical shear buckling load calculation. Two key parameters were investigated: web aspect ratio and transverse stiffener layout, corresponding to 8 tested specimens. Obtained experimental outcomes are compared to current recommendations provided by EN1993-1-5 to design the intermediate transverse stiffener, which are proven experimentally to be very conservative for the design of plate girders.
Abstract Economical design of steel plate girders usually adopts slender web panels sometimes combined with large panel aspect ratio, which determines the elastic stability of the web panel. The adoption of transverse stiffeners is one efficient strategy to retard the web buckling due to shear. The primary role of intermediate transverse stiffener is clear: divide the web into panels providing lateral support to the web plate along the span – This increases the shear strength of the web. However, FprEN 1993-1-5: 2022 stiffener design approach is based mainly on direct compressive forces resulting from the tension filed action in post buckling phase. According to multiple investigations, this area requirement is much higher than that found in laboratory testing and numerical simulations. The findings of experimental testing on eight plate girders with thin webs and two configurations of transverse stiffeners under ultimate load are presented. Using the web and stiffener measure strains, the internal stiffener forces are calculated past the shear failure of the plate girders. These results show that the axial compression and bending moment measured in the intermediate transverse stiffeners are considerably lower than those specified for the design by the FprEN 1993-1-5: 2022 .
Experimental behaviour of plate girders in steel – Internal forces in intermediate transverse stiffeners
Nascimento, Sérgio (author) / Oliveira Pedro, José J. (author) / Santos, Rafael (author) / Kuhlmann, Ulrike (author)
Engineering Structures ; 291
2023-06-01
Article (Journal)
Electronic Resource
English