Behaviour and design of high-strength steel cross-sections under combined loading

Gkantou, Michaela; Theofanous, Marios; Wang, Jie; Baniotopoulos, Charalampos; Gardner, Leroy

doi:10.1680/jstbu.16.00114

Cited by 25 publications

(42 citation statements)

References 31 publications

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“…The residual stresses present in the studied members were found to be of very low magnitude [7][8][9][10] and were therefore not explicitly modelled. The Riks algorithm [40] was employed for the solution of the nonlinear analysis accounting for both material and geometric nonlinearities.…”

Section: Development Of Fe Modelsmentioning

confidence: 99%

“…In Eqs (8) and (9), λ � is the member slenderness defined as λ � = � N pl /N cr , where Npl is the yield load and Ncr is the elastic buckling load of the tubular member, α is the imperfection factor and α k = K t /(K c + K t ) is the ratio of the axial stiffness of the tube to that of the cable-in-tubesystem, where Kc and Kt are the axial stiffness of the cable and the tube (AcEc/L and AtEt/L), respectively.…”

Section: Design Recommendationsmentioning

confidence: 99%

“…Engineering Structures; 183 510-522. foundation sizes, with direct savings in construction, transportation and erection costs. Several studies into the behaviour and design of high strength steel cross-sections and members in compression and bending have been carried out [2][3][4][5][6][7][8][9][10] to underpin the development of design rules and facilitate wider use in structural applications. However, these studies have generally only considered the response of individual elements; in the present investigation, the use of high strength steel in arched trusses, in conjunction with prestressing cables to enhance loadcarrying capacity and reduce self-weight and deflections is explored.…”

Section: Introductionmentioning

confidence: 99%

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Testing, numerical simulation and design of prestressed high strength steel arched trusses

Afshan

Theofanous

Wang

et al. 2019

Engineering Structures

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The structural behaviour of prestressed high strength steel arched trusses is studied in this paper through experimentation and numerical modelling. Four 11 m span prestressed arched trusses fabricated from S460 hot finished square hollow section members were loaded vertically to failure. Three of the tested trusses were prestressed to different levels by means of a 7-wire strand cable housed within the bottom chord, while the fourth truss contained no cable and served as a control specimen. Each truss was loaded at five points coinciding with joint locations along its span, and the recorded load-deformation responses at each loading point are presented. Inclusion and prestressing of the cable was shown to delay yielding of the bottom chord and enhance the load carrying capacity of the trusses, which ultimately failed by either in-plane or out-of-plane buckling of the top chord. For the tested trusses, around 40% increases in structural resistance were achieved through the addition of the cable, though the self-weight was increased by only approximately 3%. In parallel with the experimental programme, a finite element model was developed and validated against the test results. Upon successful replication of the experimentally observed structural response of the trusses, parametric studies were conducted to investigate the effect of key parameters such as prestress level, material grade and the top chord cross-section on the overall structural response. Based on both the experimental and numerical results, design recommendations in the form of simple design checks to be performed for such systems are provided.

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Section: Development Of Fe Modelsmentioning

confidence: 99%

Section: Design Recommendationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Testing, numerical simulation and design of prestressed high strength steel arched trusses

Afshan

Theofanous

Wang

et al. 2019

Engineering Structures

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“…In particular, steels with strength over 460 N=mm 2 could potentially allow for lighter structures, more economic design and profound sustainability benefits. The performance of high strength steels (HSSs) has been extensively studied [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A numerical study of prestressed high strength steel tubular members

Gkantou

Theofanous

Baniotopoulos

2019

Front. Struct. Civ. Eng.

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The structural behavior of prestressed high strength steel (HSS) tubular members is investigated through the execution of advanced finite element modeling. Numerical models are developed and validated against published experimental data on HSS tubular members subjected to different levels of initial prestress and loaded either in tension or compression. The effect of the presence or absence of grouting on the strength and ductility of the members is also considered. To numerically replicate the structural response recorded in the tests, some key modeling features including the employed numerical solver, the adopted material models and the element types warrant careful consideration. Upon developing of the finite element models, the numerically generated ultimate loads, the corresponding failure modes and the full load-deformation curves are compared to the experimental ones, indicating a successful validation. As anticipated, prestressing enhances the load-bearing capacity for the tensile members, whereas it is detrimental for the compressive ones. A series of parametric studies is performed to assess the influence of key factors on the structural response of prestressed HSS members and the obtained results are discussed. Design guidance for tensile and compressive prestressed tubular members is also provided.

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“…Slenderness limits in current cross-section classification system together with the material ductility requirements in European codes of practice are discussed and assessed. The sixth paper (Gkantou et al, 2017b) complements the fourth paper and presents the experimental and numerical investigations on hotrolled square and rectangular hollow section stub columns under combined compression and un-axial bending. Specimens are with nominal yield strength of 460 MPa and 690 MPa.…”

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confidence: 98%

Editorial

Chan

2017

Proceedings of the Institution of Civil Engineers - Structures

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The second part of this two-part themed issue 'High strength steel structures' captures further the state of the art in design of high strength steel structures. Part I of this themed issue can be found on the virtual library (ICE, 2017). Part II features 8 papers on topics ranging from material characteristics at elevated temperature & under cyclic loads, residual stress patterns in fabricated box sections, cross-section behavior of hollow sections under different loading scenarios, assessment on Warren-type welded tubular trusses to structural performance of eccentrically braced frames with the use of dual steel grades.The first two papers focus on the material characterisation of steel materials with nominal yield strengths of 690 MPa and 700 MPa. The first paper (Winful et al., 2017) presents an experimental investigation on 690 MPa (quenched and tempered) and S700 MPa (thermo-mechanical control processed) steel materials under isothermal tests at temperatures between 20 and 800 o C. Experimental results indicate the effect of chemical composition and processing route on their elevated temperature material performance. The comparison with the European design code is also discussed. The second paper (Wang et al., 2017) illustrates the cyclic performance of steel materials with nominal yield strength of 690 MPa (quenched and tempered) with an aim to evaluating and predicting the cyclic characteristics. Results are assessed in relation to the characteristics of the normal strength steel materials in terms of the ductility requirements, the stress-strain hysteretic behaviours, cyclic hardening/softening behaviour. A combined trilinear isotropic and kinematic model is proposed for quenched and tempered steel materials with nominal yield strength of 690 MPa.Moving from material characteristics to the effect of fabrication process on the residual stress patterns at cross-section level, the third paper (Somodi et al., 2017) summarises the experimental and numerical investigations on the residual stress patterns on welded square box sections with a wide range of steel materials with nominal yield strength between 235 MPa and 960 MPa. The assessments are based on the same cross-section geometry and the same welding procedure that was used to form the box-shaped specimens. Results indicate the compressive residual stress pattern is dependent on the cross-section geometry and independent of the yield strength. The measured maximum tensile residual stress reaches the yield strength for all steel grades in the assessment.The subsequent three papers characterise the cross-section behavior of square hollow sections from different fabrication processes and at different loading conditions. The fourth paper (Gkantou et al., 2017a) first presents a numerical investigation on hotfinished square/rectangular hollow section stub columns under concentric compression to assess the current cross-section classification system. Specimens are with nominal yield strength of 460 MPa and 690 MPa. Results indicate the applicability of the cu...

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Behaviour and design of high-strength steel cross-sections under combined loading

Cited by 25 publications

References 31 publications

Testing, numerical simulation and design of prestressed high strength steel arched trusses

Testing, numerical simulation and design of prestressed high strength steel arched trusses

A numerical study of prestressed high strength steel tubular members

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