Strength of K-Type of Joint made of S700

Viktoria Detkin, Pooya Saremi, Wei Lu, Jari Puttonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

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Integration of slim floor systems into high strength steel (HSS) trusses with K-joints promotes sustainable construction due to the high strength-to-weight ratio and open space buildings adaptable for different uses. As current design standards such as EN 1993-1-8 inadequately supports the design of HSS truss joints, in this study, two welded K-type joints made of S700 were tested using a scaled-down dimensions and examined numerically by finite element (FE) models. The scaling factors used for determining the dimensions of the downscaled joint were verified by the validated FE models. The tests on two specimens with the different chord lengths were used to define the strength of the HSS joint: which was controlled by either the ultimate strength of the tension bracing or the buckling resistance of the compression bracing. Compared to the joint of the double grade steel S355J2/S420, the results pointed out that the limit load of HSS joint was 70% higher but the joint ductility was decreased by 25% when compared to the joint of double grade steel S355J2/S420. Due to the instability failure of the compression bracing, applying a larger safety factor for the limit load of S700 joint is necessary but additional parametric studies are needed to propose the equations for the joint limit load in design use.
Original languageEnglish
Title of host publicationProceedings of the CFSRC Colloquium 2022
PublisherCold-Formed Steel Research Consortium (CFSRC)
Number of pages10
Publication statusPublished - 2022
MoE publication typeD3 Professional conference proceedings
EventCold-Formed Steel Research Consortium Colloquium - Virtual, Online
Duration: 17 Oct 202219 Oct 2022


ConferenceCold-Formed Steel Research Consortium Colloquium
Abbreviated titleCFSRC
CityVirtual, Online


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