The continuous strength method for the design of high strength steel tubular sections in compression

Lan, Xiaoyi; Chen, Junbo; Chan, Tak Ming; Young, Ben

doi:10.1016/j.engstruct.2018.02.010

Cited by 67 publications

(37 citation statements)

References 38 publications

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“…Note that the second strain limit specified in Eq. (1) confines the cross-section response to the first three segments of the quad-linear material model [41,48]. This limit exists primarily to simplify the CSM resistance functions for hand calculations.…”

Section: Materials Modelmentioning

confidence: 99%

Design of structural steel members by advanced inelastic analysis with strain limits

Fieber

Gardner

Macorini

2019

Engineering Structures

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Structural steel design is traditionally a two step process: first, the internal forces and moments in the structure are determined from a structural analysis. Then, a series of design checks are carried out to assess the strength and stability of individual members. The structural analysis is typically performed using beam finite elements, which are usually not able to capture local buckling explicitly. Instead, the assessment of local buckling and rotation capacity is made through the concept of cross-section classification, which places class-specific restrictions on the analysis type (i.e. plastic or elastic) and defines the cross-section resistance based on idealised stress distributions (e.g. the plastic, elastic or effective moment capacity in bending). This approach is however considered to be overly simplistic and creates artificial 'steps' in the capacity predictions of structural members. A more consistent approach is proposed herein, whereby a second-order inelastic analysis of the structure or structural component is performed using beam finite elements, and strain limits are employed to mimic the effects of local buckling, control the spread of plasticity and ultimately define the structural resistance. The strain limits are obtained from the continuous strength method. It is shown that not only can local buckling be accurately represented in members experiencing uniform cross-sectional deformations along the length, but, by applying the strain limits to strains that are averaged over a defined characteristic length, the beneficial effects of local moment gradients can also be exploited. The proposed method is assessed against benchmark shell finite element results on isolated members subjected to bending, compression and combined loading. Compared to conventional steel design provisions and even to existing advanced design approaches utilising second-order elastic analysis, the proposed design approach provides consistently more accurate capacity predictions.

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Section: Materials Modelmentioning

confidence: 99%

Design of structural steel members by advanced inelastic analysis with strain limits

Fieber

Gardner

Macorini

2019

Engineering Structures

View full text Add to dashboard Cite

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“…The second strain limit of C 1 u / y confines the cross-section response to the first three segments of the quad-linear material model given by Eq. (5) [26,27]. This limit exists primarily to simplify the CSM resistance functions for hand calculations and may be omitted if the full stress-strain curve (i.e.…”

Section: 1mentioning

confidence: 99%

Structural steel design using second-order inelastic analysis with strain limits

Fieber

Gardner

Macorini

2020

Journal of Constructional Steel Research

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“…Over the past few decades, significant progress has been made in understanding the structural behaviour and developing design rules for predicting the cross-section resistance of hot-rolled steel SHS and RHS in compression [1][2][3][4][5] and bending [2,3,[6][7][8]. A number of studies into the member buckling behaviour of hot-rolled steel SHS and RHS columns have also been performed [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Cross-section classification is a key aspect of many current structural steel design specifications, such as the European Standard EN 1993-1-1 (2018) [12], EN 1993EN -1-12 (2007 [13] and the American Specification AISC 360-16 (2016) [14], and determines the extent to which the resistance of a cross-section is limited by local buckling. These codified design approaches are often found to provide rather conservative and scattered resistance predictions for stocky cross-sections [3,5,8,[15][16][17] due to the neglect of the beneficial effect of strain hardening. Moreover, in the current Eurocode 3 (EC3) design framework [12,13], there exists a step in the resistance predictions of SHS and RHS in bending, as well as under combined compression and bending, at the boundary between Class 2 and Class 3 cross-sections, owing to the discrete nature of the cross-section classification system (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The CSM was originally developed for stainless steel structural elements [18], adopting an elastic, linear hardening material model to capture the strength enhancement arising from strain hardening in non-slender cross-sections. To represent the stress-strain characteristics of hot-rolled steels more accurately, a quad-linear material model has been recently proposed [21] and incorporated into the CSM framework for the design of hot-rolled steel cross-sections under pure compression [3,5] and pure bending [3,8], as well as in indeterminate structures [22,23] and cross-sections at elevated temperatures [24]. This present study extends the scope of the CSM to the design of hot-rolled normal strength steel (NSS) and high strength steel (HSS) SHS and RHS under combined axial compression and bending, based upon the recent CSM proposals for hot-rolled steel cross-sections under isolated loading conditions (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Structural performance and design of hot-rolled steel SHS and RHS under combined axial compression and bending

2020

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The structural behaviour and design of hot-rolled steel square and rectangular hollow sections (SHS and RHS) under combined axial compression and bending are studied in the present paper. Finite element (FE) models were developed and validated against existing experimental results on hot-rolled normal strength and high strength steel SHS and RHS under combined loading. Upon validation against the test results, an extensive parametric study was then performed with the aim of expanding the available structural performance data over a wide range of cross-section geometries, cross-section slendernesses, steel grades and loading scenarios. Both the experimentally and numerically obtained data were utilised for an assessment of the accuracy of the current design rules in European and American standards for hot-rolled steel tubular sections under combined loading. The comparisons revealed that the codified capacity predictions are generally somewhat conservative and scattered, due mainly to the neglect of strain hardening in the case of stocky cross-sections and the rather crude treatment of the partial spread of plasticity for Class 3 (semi-compact) cross-sections. The deformation-based continuous strength method (CSM) has been successfully applied to the Yun, X., Wang, Z. and Gardner, L. (2020). Structural performance and design of hot-rolled steel SHS and RHS under combined axial compression and bending. Structures, 27, 1289-1298.2 design of hot-rolled steel cross-sections under isolated loading conditions (i.e. compression or bending), and shown to provide more accurate and consistent ultimate resistance predictions than the existing design provisions. This paper presents the first study to extend the CSM to the design of hot-rolled steel SHS and RHS, made of both normal and high strength steels, under combined loading, underpinned by both experimentally and numerically derived data points. Advantages of the proposed approach include eliminating the discontinuity in the current codified methods, yielding more accurate and consistent resistance predictions and providing knowledge of the level of strain required to reach a given resistance. The reliability of the proposed method is statistically verified in accordance with EN 1990.

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The continuous strength method for the design of high strength steel tubular sections in compression

Cited by 67 publications

References 38 publications

Design of structural steel members by advanced inelastic analysis with strain limits

Design of structural steel members by advanced inelastic analysis with strain limits

Structural steel design using second-order inelastic analysis with strain limits

Structural performance and design of hot-rolled steel SHS and RHS under combined axial compression and bending

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