Prestressed cold-formed steel beams: Concept and mechanical behaviour

Hadjipantelis, Nicolas; Gardner, Leroy; Wadee, M. Ahmer

doi:10.1016/j.engstruct.2018.06.027

Cited by 35 publications

(48 citation statements)

References 46 publications

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“…Prestressed cold-formed steel beams can provide highly-efficient structural solutions [1,2] and, as demonstrated in the present paper, can be designed by adapting existing design methods, namely linear interaction equations in conjunction with the Direct Strength Method (DSM) [3,4]. Owing to the enhanced performance of the studied beams, for a given span and imposed vertical load, a smaller cross-section is required and thus a more lightweight solution is achievable.…”

Section: Introductionmentioning

confidence: 89%

“…The concept of prestressing cold-formed steel beams in order to increase their moment capacity was introduced by the authors in [1]. Essentially, in the proposed concept, a prestressed cable is housed within the bottom hollow flange of the cold-formed steel beam and is used to introduce initial stresses within the beam that counteract the stresses imposed during the vertical loading stage.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical behaviour of the proposed beams has been simulated using finite element (FE) modelling in [1], where the key features of the developed models, including the initial geometric imperfections, the beam-cable connection and the loading conditions, are described. Sample FE results were compared with analytical results, obtained using a set of linear elastic expressions, and a set of failure criteria that predict the capacity of the coldformed steel beam and prestressed cable during the prestressing or imposed vertical loading stages, with excellent agreement being demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Design of prestressed cold-formed steel beams

Hadjipantelis

Gardner

2019

Thin-Walled Structures

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Structural design rules for prestressed cold-formed steel beams, considering both the prestressing and imposed vertical loading stages, are presented herein. In the proposed approach, the cold-formed steel member is designed as a beam-column using linear interaction equations in conjunction with the Direct Strength Method (DSM), while the prestressed cable is designed by ensuring that its tensile capacity is not violated during the two loading stages. In the present paper, the design approach and the failure criteria, which define the permissible design zone for the prestressed system, are first introduced. The suitability of the design recommendations is then assessed by comparing a set of parametric finite element (FE) results for several combinations of prestress levels, beam geometries and cable sizes, with the corresponding design predictions. Finally, following reliability analysis, the implementation of the design recommendations is illustrated through a practical worked example.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of prestressed cold-formed steel beams

Hadjipantelis

Gardner

2019

Thin-Walled Structures

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“…Stressed-arch frames which have emerged as a promising structural system appropriate for long unsupported spans were extensively studied in Australia several decades ago [14][15][16][17]. The behaviour of prestressed beams [18][19][20][21], columns [22][23], trusses [24][25][26][27][28] and frames [29][30] has also been explored. A number of recent studies of steel structures in which cables are housed within hollow sections have been carried out [31][32][33]; this provides a practical means of prestressing, while also protecting the cables.…”

Section: Introductionmentioning

confidence: 99%

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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“…Young [5]. A pioneering concept has been presented by N. Hadjipantelis [6] to enhance the load-carrying capacity and serviceability performance of cold-formed steel beams with utilizing prestressing techniques.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation for Non and Partially Composite Cold-Formed Steel Floor Beams

Qasim

Al-Zaidee

2019

Civ Eng J

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In this study, six full-scaled models of RC floors supported by cold-form steel sections have been tested. Each model consists of RC 75mm thick slab supported on two parallel cold-formed steel beams with a span of 3m and spacing of 500mm. The slab has an overhang part of 250mm on each side. In the first and fourth models, the slab has been casted directly on the top flanges with no shear connector to simulate the effectiveness of friction in resisting of the lateral-torsional buckling. Shear studs have been drilled in the second and fifth models to ensure the composite action. Finally, the flanges have been embedded for the third and sixth models. A single channel beam is used in the first, second, and third models while a built-up beam is used in the fourth, fifth, and sixth models. Each model has been loaded up to failure under a pure bending with two-line loads located at the third points. Data for loads, deformations, and strains have been gathered. Except the fourth and the sixth models that failed in local buckling modes, all other models failed in global lateral-torsional buckling modes. For the single beam models; the load carrying capacity of the non-composite model is 82.9% less than the capacity of the composite models with shear studs and embedded flange. For the built-up models; the load carrying capacity of the non-composite model is 44.2 % less than the loads of the composite model with shear stud and 48.7% less than the model with the embedded flange.

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Prestressed cold-formed steel beams: Concept and mechanical behaviour

Cited by 35 publications

References 46 publications

Design of prestressed cold-formed steel beams

Design of prestressed cold-formed steel beams

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

Experimental Investigation for Non and Partially Composite Cold-Formed Steel Floor Beams

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