Translating the material fracture resistance into representations in welded tubular structures

•We present a method to integrate J–R curves in the P–Δ response of tubular joints.•We propose a lower-bound J–R curve for a wide range of structural steels.•The validation on both the joint and frame behavior confirms the proposed method. This paper presents an approach to integrate a lower-bound m...

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Veröffentlicht in:Engineering fracture mechanics 2015-10, Vol.147, p.278-292
Hauptverfasser: Qian, Xudong, Zhang, Yang
Format: Artikel
Sprache:eng
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Zusammenfassung:•We present a method to integrate J–R curves in the P–Δ response of tubular joints.•We propose a lower-bound J–R curve for a wide range of structural steels.•The validation on both the joint and frame behavior confirms the proposed method. This paper presents an approach to integrate a lower-bound material J–R curve into the load–deformation relationship for circular hollow section joints. The lower-bound J–R curve derives from a regression analysis of the experimental data for a wide range of structural steels reported in the literature and follows a linear relationship up to a maximum crack extension of 2.0mm. The deterioration in the joint strength caused by ductile tearing adheres to a reduction factor based on the crack area. The J–R curve modified load–deformation responses compare closely with reported experimental results for both welded tubular joints and large-scale tubular frames.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2015.02.023