Design of cold-formed high strength steel tubular sections undergoing web crippling

Li, Haiting; Young, Ben

doi:10.1016/j.tws.2018.09.005

Cited by 44 publications

(26 citation statements)

References 20 publications

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“…Initial geometric imperfections were induced into thin-walled steel sections during the process of manufacturing, transportation and handling, and may affect their structural responses [21][22][23]. The Initial local geometric imperfection of each angle (and channel) section stub column specimen was therefore measured.…”

Section: Measurements On Initial Local Geometric Imperfectionsmentioning

confidence: 99%

Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns

Wang

Zhao

Young

2020

Engineering Structures

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A comprehensive experimental and numerical study of the cross-sectional compressive behaviour and resistances of press-braked S960 ultra-high strength steel (UHSS) angle and channel section stub columns is reported in this paper. The experimental study was carried out on four equal-leg angle sections and eight plain channel sections, and comprised material testing, initial local geometric imperfection measurements and 18 stub column tests. The experimental setups, procedures and key observations were fully presented. The experimental study was then supplemented by a finite element (FE) simulation programme, in which FE models were firstly developed to replicate the test structural responses and subsequently used to generate further numerical data over a wide variety of cross-section sizes. It is worth noting that the current international standards established in Europe, America and Australia/New Zealand only cover the design of structural members with material grades up to S700, and thus the examined S960 UHSS angle and channel section stub columns are out of the scope of the existing design standards. In this study, the experimentally and numerically acquired data was adopted to assess the applicability of the codified provisions and formulations to the design of S960 UHSS angle and channel section stub columns. The assessment results generally indicated that the current European code leads to overall consistent and accurate predictions of cross-section compression resistances, but with many overestimated predicted resistances for S960 UHSS channel section stub columns, while the American and Australian/New Zealand standards yield unduly scattered design cross-section compression resistances, with unsafe and overly conservative predicted resistances respectively for S960 UHSS channel section stub columns and slender angle section stub columns. Revised codified design rules were also proposed, and shown to yield safe, accurate and consistent design cross-section compression resistances for S960 UHSS angle and channel section stub columns.

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Section: Measurements On Initial Local Geometric Imperfectionsmentioning

confidence: 99%

Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns

Wang

Zhao

Young

2020

Engineering Structures

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“…Cost-effectiveness for end users is another benefit which could be gained by weight saving in the structure [1,2]. The aforementioned advantages encourage variety of engineering sectors particularly construction [2][3][4][5][6][7], and automotive industry [8][9][10], to continuously look for the new applications of higher grades of steel. The available common manufacturing methods to produce HSS/UHSS are quenching and tempering (Q&T), and direct quenching (DQ) [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of heat input on the mechanical properties of butt-welded high and ultra-high strength steels

Amraei

Ahola

Afkhami

et al. 2019

Engineering Structures

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In this study, the mechanical properties of butt-welded thin plates made of S700, S960 and S1100 steels under various heat inputs (HI) are investigated. The gas metal arc welding (GMAW) process with two different levels of HI, and laser welding (LW) are implemented for this purpose. Fully automated welding process is employed to attain high quality and homogeneous weldments. Standard tensile tests of the butt-welded joints, together with micro-hardness measurements are conducted in this study. The microstructure of the heat affected zones (HAZ) of the weldments are closely examined using scanning electron microscopy (SEM). It was observed that while the fracture was occurred at the base materials of all S700 and S1100 weldments, the S960 suffered from failure at the HAZ which resulted in reduction of the joint's strength and ductility. For all the studied steels, it was found that the joint's ductility is highly dependent on HI values over the range of 0.3-1.4 kJ/mm for each welding pass. Though, the S1100 steel showed the best performance under welding HI with a moderate change in its mechanical properties and a stable microstructure after welding compared to S700 and S960.

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“…The four-nodded shell element with reduced the integrations (SR4) was used to discretise the tested cold-formed steel sigma sections and the analytical rigid plate was used to model the bearing plates. The SR4 element has been shown in past studies to give accurate results when modelling cold-formed sections subjected to web crippling [17][18][19][20][21]. As in the tests, three bearing plate widths were employed for each cross-section.…”

Section: Modelling Assumptionsmentioning

confidence: 99%

Web Crippling Behavior of Sigma Purlins

Almatrafi¹,

Theofanous

Bock

et al. 2021

ce papers

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Due to their thin‐walled nature and complex geometry, cold‐formed steel purlins are prone to a variety of instabilities. In most applications, purlins rely on the attached sheeting to restrain member buckling and hence their cross‐section is optimized to maximize their cross‐sectional resistance to local and distortional buckling caused by sagging bending moments under the action of a uniformly distributed load. Sigma purlins are a family of cold‐formed steel members with folding‐lines along their webs. The non‐straight geometry of their web is beneficial in terms of reducing the local slenderness of the web, however it increases their susceptibility to web crippling in case the purlins are subjected to concentrated transverse loads and hence it may reduce the overall moment resistance. This study reports a series of experimental tests on sigma purlins interior‐one‐flange (IOF) loading condition. The tested specimens employ two different section geometries and three different bearing plate widths. The test results show that all the specimens failed by web crippling, however two distinct failure modes and corresponding load‐deformation curves are observed depending on the section geometry. To investigate further the effect of web geometry on the IOF web crippling strength of sigma sections, an FE model was developed and validated against the reported test results. Following successful replication of the experimental observations, a comprehensive parametric study was performed and several sigma sections were numerically tested. Furthermore, the applicability of a novel slenderness‐based design approach previously proposed by Duarte and Silvestre for the web crippling design of channel sections is assessed and design recommendations are proposed.

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Design of cold-formed high strength steel tubular sections undergoing web crippling

Cited by 44 publications

References 20 publications

Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns

Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns

Effects of heat input on the mechanical properties of butt-welded high and ultra-high strength steels

Web Crippling Behavior of Sigma Purlins

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