Out-of-plane stability design of steel beams by second-order inelastic analysis with strain limits

Quan, Chunyan; Kucukler, Merih; Gardner, Leroy

doi:10.1016/j.tws.2021.108352

Cited by 23 publications

(20 citation statements)

References 52 publications

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“…The comparisons highlight the advantages of using the design approach, with a more consistent, rational and systematic treatment of local buckling, material nonlinearity, strain hardening and the influence of local moment gradients. This has been further demonstrated in a number of studies [20,21,23] showing that design by advanced inelastic analysis with CSM strain limits enables accurate predictions of resistance of structures while allowing for the structural failure mechanism to be clearly visualised. More details in terms of the treatment of the interaction between bending, shear and torsion and some key aspects of the FE modelling in the framework of the design approach can be found in [21,23].…”

Section: Key Aspects Of Design By Advanced Inelastic Analysis With Cs...mentioning

confidence: 90%

“…the ability of the less heavily loaded cross-sections to provide some support in resisting local buckling to the adjacent critical cross-section, have been previously recognised [44]. To account for this beneficial effect, a strain averaging approach has been proposed and implemented into design by advanced analysis [20][21][22][23]. The strain averaging approach requires the CSM strain limit εcsm to be applied to an averaged compressive strain εEd,Lb across the local buckling halfwavelength Lb,cs (see Fig.…”

Section: Key Aspects Of Design By Advanced Inelastic Analysis With Cs...mentioning

confidence: 99%

“…The CSM has now been applied to the design of steel [3,4], stainless steel [5][6][7][8], aluminium alloy [9,10], reinforced concrete [11] and composite structures [12,13], as well as steel structures in fire [14,15]. Recent attention has been focussed upon extension of the CSM to member-level design [16][17][18][19] and incorporation of the CSM into a framework of design by advanced analysis [20][21][22][23] and into codes of practice; the CSM now features in the AISC Design Guide for Structural Stainless Steel (2013), the fourth edition of the SCI Design Manual for Structural Stainless Steel (2017), the draft prEN 1993-1-4 for the design of stainless steel structures, the draft prEN 1993-1-14 for the design of steel structures by finite element analysis, the ASCE Specification ASCE-8-21 for the design of cold-formed stainless steel structures and the AISC Specification AISC 370 for the design of hot-rolled and welded stainless steel structures. A review of the background, key concepts and components, and fundamental design equations of the CSM is presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Continuous Strength Method – Review and Outlook

2022

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The Continuous Strength Method (CSM) is a deformation-based approach to the design of structures that enables a continuous, rational and accurate allowance for material nonlinearity. Central to the method is the application of strain limits to define the resistance of a structural member or system.The method can be applied to structures formed using different materials and manufacturing processes and can be used for steel-concrete composite design and in fire scenarios. The design method enables enhancements in structural efficiency and, unlike traditional approaches, allows the assessment of both strength and ductility demands (particularly relevant for high strength steel) at the ultimate limit state. For hand calculations, a set of straightforward CSM design equations have been developed. Recognising the increasing importance and use of advanced analysis, recent research, summarised herein, has focused on integration of the CSM strain limits into a framework of design by second order inelastic analysis, where the benefits of the method become even more substantial. This paper provides a review of the background and recent developments, including incorporation into design standards.

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Section: Key Aspects Of Design By Advanced Inelastic Analysis With Cs...mentioning

confidence: 90%

Section: Key Aspects Of Design By Advanced Inelastic Analysis With Cs...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Continuous Strength Method – Review and Outlook

2022

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“…The comparisons of the member capacity predictions obtained using the proposed design method Mu,prop with unreduced CSM limits εcsm and reduced CSM limits εcsm,V plus the shear check, for I-section members subjected to 3-point minor axis bending and SHS/RHS members subjected to 3-point major and minor axis bending are presented in [35].…”

Section: Laterally-restrained Beamsmentioning

confidence: 99%

“…Abaqus [31]) do not enable the extraction of the individual St. Venant TSt,Ed and warping Tw,Ed torsion components. A means of separating the internal St. Venant TSt,Ed and warping torsion Tw,Ed components within steel elements is provided in [35].…”

Section: Internal Torsion Effects and Torsional Resistances Of Steel ...mentioning

confidence: 99%

Out‐of‐plane Stability Design by GMNIA – Equivalent Imperfections and Strain Limits

et al. 2022

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An accurate and consistent approach to the out‐of‐plane stability design of steel beams and structures utilising geometrically and materially nonlinear analysis with imperfections (GMNIA) and strain limits is proposed. The method is implemented using computationally efficient beam elements, with the ultimate structural resistance defined either by (i) the ultimate load factor or (ii) the load factor at which a strain limit, determined on the basis of the continuous strength method (CSM), is attained, whichever occurs first. In the present paper, the scope of this method is extended from the in‐plane design of steel structures and structural components to scenarios in which out‐of‐plane stability effects, with a focus on lateral‐torsional buckling (LTB), govern. First, two shapes and corresponding amplitudes of equivalent imperfections, which consider the combined influence of both geometric imperfections and residual stresses, for the out‐of‐stability design of steel and stainless steel members by GMNIA are established. The existing CSM strain limits for in‐plane design are then extended to allow for the influence of shear, torsion and warping, to enable their general applicability to three‐dimensional buckling problems. It is shown that employing the proposed design method together with the proposed equivalent imperfections generally provides more accurate and consistent ultimate strength predictions than traditional Eurocode design calculations and also streamlines the design process by eliminating the need for cross‐section classification and individual member design checks.

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Design of Steel Columns in Fire using Second‐order Inelastic Analysis with Strain Limits

Murtaza¹,

Kucukler²

2022

ce papers

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In this paper, a structural steel fire design approach using second‐order inelastic analysis with strain limits is proposed and applied to the design of steel columns in fire. The proposed design approach employs beam finite elements to conduct a second‐order inelastic analysis. Within the proposed method, strain limits are used to account for the effects of local buckling; while global instability, the loss of strength and stiffness and thermal effects are fully considered through second‐order inelastic analysis carried out using beam finite elements. The proposed method is assessed against validated shell FE results. It is observed that the proposed design approach provides consistently accurate and safe capacity predictions for steel columns in fire.

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Out-of-plane stability design of steel beams by second-order inelastic analysis with strain limits

Cited by 23 publications

References 52 publications

The Continuous Strength Method – Review and Outlook

The Continuous Strength Method – Review and Outlook

Out‐of‐plane Stability Design by GMNIA – Equivalent Imperfections and Strain Limits

Design of Steel Columns in Fire using Second‐order Inelastic Analysis with Strain Limits

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