Influence of tensile chord stresses on the strength of CHS X-joints – Experimental and numerical investigations

Lipp, Andreas; Ummenhofer, Thomas

doi:10.1201/b18410-59

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…Fig. 7 compares the results from this study and other experimental sources (Noordhoek and Verheul [8], Puthli et al [9], Lipp and Ummenhofer [10]) with the nominal strength of two design standards: Eurocode 3 ([11], [12]) (EC3) and ISO 14346 ( [13]). These two standards permit the use of high-strength steel tubular joints, but require the inclusion of a strength reduction factor.…”

Section: Discussion On Structural Performance Of High-strength Steelmentioning

confidence: 91%

Structural performance of CHS X‐joints fabricated from high‐strength steel

Lee

Kim

2018

Steel Construction

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Representative steel design standards have limited the use of high-strength steels to tubular joints, partly because of concerns about their unique material characteristics. However, the mechanical background behind the limitations is unclear, and its validity needs to be re-evaluated. In this study, a set of CHS (circular hollow section) X-joints fabricated from cold-formed tubes was tested under static axial compression. Then, as supplemental work, extensive test-validated numerical analyses were carried out to investigate further the behaviour of high-strength steel CHS X-joints. In both the testing and the analyses, where three steel grades covering ordinary to very high-strength steels were considered, the high-strength steel joints showed satisfactory structural performance comparable with that of ordinary steel joints in terms of strength and ductility.

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Section: Discussion On Structural Performance Of High-strength Steelmentioning

confidence: 91%

Structural performance of CHS X‐joints fabricated from high‐strength steel

Lee

Kim

2018

Steel Construction

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“…The first character X represents CHS X-joint, and is followed by the brace to chord angle  (90°), the letter S indicating saturation of chord length, and subsequently , 2 and n. 의 경우 힘-변형 그래프의 일반적인 형상과는 무관하다. hoek and Verheul [9] , 1998; Lipp and Umenhofer [21] , 2015;…”

Section: 해석모델 수립 및 검증mentioning

confidence: 99%

Numerical Study of High-strength Steel CHS X-joints Including Effects of Chord Stresses

Kim¹,

Lee²

2018

kjoss

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Internationally representative steel design standards have forbidden or limited the application of high-strength steels to tubular joints, partly because of concerns about their unique material characteristics such as high yield ratio. Most of design standards stipulate that for steels whose yield strengths exceed 355 or 360 MPa, the strength equations cannot be utilized or strength reduction factor below 1.0 should be multiplied. However, the mechanical background behind these limitations is not clear. Experimental testing of high-strength steel CHS (circular hollow section) X-joints recently conducted by the authors also clearly indicated that the current limitations might be unduly conservative. As a continuing work, extensive, test-validated numerical analyses were made to investigate the behavior of high-strength steel CHS X-joint under axial compression. Three steel grades covering ordinary to very high strength steels were considered in the analysis. Again it was found that the high strength penalty to the joint strength in current standards is too severe and needs to be relaxed. The high-strength steel joints under the effects of chord stress generally showed higher strength than the ordinary steel joints and their strengths were conservatively predicted by current standards. It is also emphasized that current format of the CHS X-joint strength equation does not reflect observed behavior and needs to be recast.

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

Kim

Lee

2020

Engineering Structures

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Influence of tensile chord stresses on the strength of CHS X-joints – Experimental and numerical investigations

Cited by 5 publications

References 1 publication

Structural performance of CHS X‐joints fabricated from high‐strength steel

Structural performance of CHS X‐joints fabricated from high‐strength steel

Numerical Study of High-strength Steel CHS X-joints Including Effects of Chord Stresses

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

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