Stronger steels, higher penalties

Evaluation of flexural buckling experiments performed on welded high-strength steel struts

Document identifier:
Access full text here:10.1002/cepa.1127
Keyword: Engineering and Technology, Civil Engineering, Infrastructure Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Infrastrukturteknik, Other Civil Engineering, Annan samhällsbyggnadsteknik, High-strength steel, Flexural buckling, State-of-art, Statistical evaluation, Byggkonstruktion, Structural Engineering
Publication year: 2019

Stability in a structural mechanics context has posed a continuous problem throughout history for mathematicians, engineers and architects. Flexural buckling is one of the main problems steel structures are faced with in order to ensure an economic design. Different equations have been derived to estimate critical loads that could lead to collapse of compressed members. The buckling resistance of compressed struts are calculated in Europe using the European buckling curves. The method of calculating the resistance implies the use of a reduction factor based on 5 different buckling curves. These buckling curves differ based on type of cross-section, fabrication method and steel grade. The method has been generally accepted since it proved to be reliable and versatile. The current design codes are assigning the same relevant buckling curve to the sections made of steels with yield stress of above 460 MPa. This conservative approach is one of the reasons that discourages the use of high-strength steels in common structural applications, since the designer does not see a direct benefit from the additional steel strength. The first part of the paper briefly describes the origin of the European buckling curves. The second part presents two analytical models for calculating flexural buckling limit loads. Flexural buckling experiments performed on welded box and I-sections made of high-strength steel, with the yield stress in the range of 690-960MPa. The third part analyses the existing buckling experiments and statistically evaluates the models proposed for estimating the resistance of high-strength steel struts subjected to pure compression. The final part addresses the potential future research in the context of developing adequate flexural buckling curves for high strength steel (HSS) members.


Gabriel Sabau

Luleå tekniska universitet; Byggkonstruktion och brand; Steel Structures
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Ove Lagerqvist

Luleå tekniska universitet; Byggkonstruktion och brand
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Nancy Baddoo

Steel Construction Institute, UK
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