Deformation and strain limits for IPB-loaded high strength steel CHS joints

Kim, Seon‐Hu; Lee, Cheol-Ho; Han, Sang-Hui; Wardenier, J.

doi:10.1016/j.tws.2022.109681

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…This ultimate limit allows less joint rotation angle for high strength steel joints; it accounts for their lower ductility and reduced rotation capacity through the strain hardening ratio f u0 / f y0 . The rationale behind the proposed rotation angle limit can be found in Kim et al (2022). While the rotation angle limit yields ultimate resistance comparable to the traditional 3% d 0 indentation limit (Lu et al, 1994), it can be also utilized as a practical fracture limit criterion in numerical analysis of high strength steel joints subjected to in-plane rotation.…”

Section: Test Results Of Chs Jointsmentioning

confidence: 99%

“…The M ip,1,u / M ip,1,Rd ratio of the chord failure limit state is shown in Figure 12(a) and (b) respectively for CHS X- and T-joints. In Figure 12(a) and (b), the FE analysis results of Kim et al (2022) are presented together with the test data. These FE results, with f y0 = 830 MPa, may be seen as the “baseline” resistance, independent from the influence of various uncertainties that exist in the fabricated joints, e.g., material softening due to welding.…”

Section: Test Results Of Chs Jointsmentioning

confidence: 99%

“…Although the design resistances for all S690 joints were governed by the chord punching shear limit state, the actual failure mode observed was the brace fracture at the heat affected zone except for one joint with a particularly large brace thickness. ; Kim et al (2022) proposed a deformation limit criterion for IPB-loaded CHS joints which is applicable to both mild and high strength steels. The proposed criterion, which was validated both experimentally and numerically, allows less joint rotation angle for high strength steel joints accounting for their lower ductility and reduced rotation capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Kim and Lee (2021); Kim et al (2022) proposed a deformation limit criterion for IPB-loaded CHS joints which is applicable to both mild and high strength steels. The proposed criterion, which was validated both experimentally and numerically, allows less joint rotation angle for high strength steel joints accounting for their lower ductility and reduced rotation capacity.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed criterion, which was validated both experimentally and numerically, allows less joint rotation angle for high strength steel joints accounting for their lower ductility and reduced rotation capacity. Parametric finite element (FE) analyses performed by Kim et al (2022) showed that, for grade 700 steels, the ultimate IPB resistance determined based on the proposed criterion can be conservatively predicted by the design resistance and material factor given in prEN 1993-1-8.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of cold formed high strength steel tubular joints subjected to moment loading

Kim

Lee

Ryu

et al. 2023

Advances in Structural Engineering

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In recent years, simple design methods for high strength steel tubular joints have been proposed by several design standards. According to these standards, the design resistance of high strength steel joints is obtained from the same design equations used for mild steel joints, but the resistance should be reduced properly by applying the material factor and/or the design yield stress. The material factor is a direct reduction factor to design resistance which generally corresponds to 0.9 for 460-grade and 0.8 for 700-grade steels, while the design yield stress (or fu/ fy limit) is a measure to account for the low fu/ fy ratios of high strength steels. In this study, a recent experimental program on moment-loaded high strength steel tubular joints is reported, which covered both circular (CHS) and rectangular (RHS) hollow section joints and both in-plane bending (IPB) and out-of-plane bending (OPB) moments. Based on the test results and additional test data collected from available database, the design equations, material factor, and design yield stress recommended by the revised draft of EN 1993-1-8 (prEN 1993-1-8) are evaluated for moment-loaded tubular joints made of grade 700 steels. It is shown that the prEN 1993-1-8 equations, combined with the material factor and design yield stress, generally provide conservative moment resistances for 700-grade tubular X and T-joints. However, based on the experimental implication that nonuniform stress distribution may cause an early fracture in CHS joints, it is suggested that the effective width, which is usually considered only for RHS joints, be considered also for CHS joints subjected to OPB.

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Section: Test Results Of Chs Jointsmentioning

confidence: 99%

Section: Test Results Of Chs Jointsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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