Investigation of high-strength steel CHS X-joints loaded in compression including effect of chord stresses

Kim, Seon‐Hu; Lee, Cheol-Ho

doi:10.1016/j.engstruct.2019.110052

Cited by 12 publications

(4 citation statements)

References 9 publications

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“…Similar discussions regarding the material factor have been also made for other types of axially loaded joints, including CHS T and K-joints [5] and rectangular hollow section (RHS) joints [6,7]. These research works have indicated that the material factors in current design standards are generally satisfactory for axially loaded joints, although they could be unduly conservative for specific geometries or failure modes [8,9].…”

Section: Introductionmentioning

confidence: 70%

Static Behaviour of High‐Strength Steel CHS T‐Joints under In‐Plane Moment Loading

Kim¹,

Lee²

2021

ce papers

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In steel moment frames or vierendeel trusses comprised of hollow section members, T‐shaped joints are formed that are subjected to brace in‐plane bending moment (IPB). For mild steel, a large number of studies have been conducted on the behavior of tubular T‐joints subjected to IPB. However, the studies for high‐strength steel T‐joints are quite limited and mostly focused on axially loaded cases. In this paper, recent testing program conducted by the authors for high‐strength steel circular hollow section (CHS) T‐joints under IPB was presented. Supplemental numerical parametric study was conducted using the test‐validated nonlinear finite element (FE) analyses. In the FE analyses, various geometric shapes were considered such that the effect of key geometric factors and important failure modes could be identified. Based on the experimental and numerical results, a more rational deformation limit criterion under IPB loading was first proposed which can be applied to both mild and high‐strength steel joints. The chord plastification strength of high‐strength steel joints was evaluated using existing formulae and the required material factor for 700 MPa steel was suggested.

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Section: Introductionmentioning

confidence: 70%

Static Behaviour of High‐Strength Steel CHS T‐Joints under In‐Plane Moment Loading

Kim¹,

Lee²

2021

ce papers

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“…21c. This is in contrast to X-joints; in X-joints, the highest tensile strain develops around the mid-height of the chord sidewall [13]. Overall, the measured tensile strains were higher in the T-joints than in the X-joint counterparts (θ 1 = 90°).…”

Section: Articlementioning

confidence: 80%

“…However, the actual ultimate joint resistance does not retain such direct proportionality to f y0 in most cases and tends to decrease when HSS is applied (i.e. when f y0 increases) [13]. Considering this, the design resistance of HSS joints is generally obtained by applying some reduction to the basic design equation (see Tab.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of CHS T/Y‐joints fabricated from high‐strength steel

Kim

Lee

2021

Steel Construction

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In this study, an experimental program on welded hollow section joints fabricated from high‐strength steel is presented. The experimental program tested a total of six T or Y cold‐formed circular hollow section (CHS) joints under brace axial compression. One mild steel with a nominal yield stress of 355 MPa and two high‐strength steels with nominal yield stresses of 460 and 650 MPa were included. The test results and existing test database were used to evaluate the relevant design provisions for high‐strength steel joints. The material factor – used in the current standards to reduce the design resistance of high‐strength steel tubular joints – was found to be adequate for CHS T/Y‐joints with steel grades up to 700 MPa. The chord stress effect resulting from a particular test setup needs to be considered when evaluating the experimental joint strength. The experimental load‐indentation relationships were analysed to appraise the behaviour of high‐strength steel CHS T/Y‐joints from the perspectives of ductility and serviceability. The ductility of high‐strength steel T/Y‐joints is slightly lower than that of mild steel joints. T/Y‐joints show relatively lower ductility and serviceability performance compared to CHS X‐joint counterparts that comprise identical members. Local strain distributions in tested T/Y‐joints of different steel grades were analysed to identify the location and intensity of strain concentration. The possibility of fracture failure near the weld seam of the cold‐formed chord member is discussed.

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“…Thus, other recent studies (Kim and Lee, 2020; Lima et al, 2018a; Nizer et al, 2016) have shown that, depending on the intensity of tension stresses in a chord, an increase in joint resistance could occur, what was never found in compression cases. For cases with compression stresses, the brace-to-chord ratio was identified as a critical parameter that influenced the joint strength of T-joints with reinforcements (Chang et al, 2020).…”

Section: Introductionmentioning

confidence: 91%

Experimental and numerical assessment of CHS-RHS T-joints with chords subjected to axial tensile forces

Neto

Nunes

Sarmanho

et al. 2021

Advances in Structural Engineering

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Hollow steel sections are widely used in the construction industry due to their mechanical properties. Joints used in these structures are the subject of research because of their singular and critical behavior. Joints containing chords with more slender cross-sections and axially loaded are still a challenge for design, especially in joints with circular hollow sections (CHS) in the braces and rectangular hollow sections (RHS) in the chords. In this context, this work aimed to study joints formed by a combination of CHS braces subjected to compression loads and RHS chords axially loaded with tension, welded as T-joints. Experimental tests, a numerical model using finite elements, and a parametric analysis were developed. A new equation for the chord stress function was proposed, including joints containing chords with semi-compact sections in tension. The joint resistance values obtained through the numerical models were compared with the equations from ISO 14346:2013 and with the proposed equation. It was observed that, for the numerical models with geometric properties inside the normative validity ranges of ISO 14346:2013, the mean rate of analytical by numerical joint resistance results was equal to 68%, using either the normative or the proposed equation. In the same way, for models outside the current validity ranges, either the proposed equation or the modified equation from ISO 14346:2013 could be used to design CHS-RHS T-joints with the geometric and material properties analyzed.

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Investigation of high-strength steel CHS X-joints loaded in compression including effect of chord stresses

Cited by 12 publications

References 9 publications

Static Behaviour of High‐Strength Steel CHS T‐Joints under In‐Plane Moment Loading

Static Behaviour of High‐Strength Steel CHS T‐Joints under In‐Plane Moment Loading

Experimental investigation of CHS T/Y‐joints fabricated from high‐strength steel

Experimental and numerical assessment of CHS-RHS T-joints with chords subjected to axial tensile forces

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