Dynamic behaviour of steel–concrete composite under-deck cable-stayed bridges under the action of moving loads

Madrazo-Aguirre, Fernando; Ruiz-Teran, Ana M.; Wadee, M. Ahmer

doi:10.1016/j.engstruct.2015.09.014

Cited by 24 publications

(11 citation statements)

References 17 publications

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“…In comparison with the flat regions, a finer mesh is employed in the corner and stiffener regions to ensure an accurate representation of the geometry. The cable is modelled using 2-noded three-dimensional T3D2 [42] truss elements that are often employed to model slender structural members that can transmit axial forces only [15,52]. The longitudinal element size for both the cold-formed steel section and the cable is 10 mm.…”

Section: Element Types and Meshing Schemementioning

confidence: 99%

Prestressed cold-formed steel beams: Concept and mechanical behaviour

Hadjipantelis

Gardner

Wadee

2018

Engineering Structures

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An innovative concept, whereby the load-carrying capacity and serviceability performance of cold-formed steel beams are enhanced by utilising prestressing techniques, is presented. The prestressing force is applied by means of a high-strength steel cable, which is housed at a location eccentric to the strong geometric axis within the bottom hollow flange of the cold-formed steel beam, inducing initial stresses in the beam that are opposite in sign to those introduced during the subsequent loading stage. As a consequence, the development of local instabilities during loading is delayed and thus the capacity of the beam is enhanced. Furthermore, the pre-camber induced during prestressing, as well as the contribution of the cable to the bending stiffness of the system, decrease the overall vertical deflections of the beam. The conceptual development of prestressed cold-formed steel beams and a study investigating the potential benefits are presented. The mechanical behaviour of the proposed beams in both the prestressing and imposed loading stages is described in terms of analytical expressions, while failure criteria for the design of the cold-formed steel beam and the cable are also developed by employing interaction equations in conjunction with the Direct Strength Method. Geometrically and materially nonlinear finite element analysis with imperfections is employed to simulate the behaviour of the proposed beams. Sample numerical results are presented and compared with the developed analytical expressions and failure criteria, demonstrating the substantial enhancement in moment capacity and serviceability performance offered by these beams.

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Section: Element Types and Meshing Schemementioning

confidence: 99%

Prestressed cold-formed steel beams: Concept and mechanical behaviour

Hadjipantelis

Gardner

Wadee

2018

Engineering 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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“…The behavior of prestressed load-bearing steel structures was later on analyzed by Belenya [2], while a technique to erect arched trusses with sliding joints through prestressing of a cable, which also forms part of the load bearing structure, has been patented by Ellen [3]. Research on stressed-arch frames has been extensively carried out in Australia [4,5], whereas the behavior of prestressed steel structures has been recently examined by a series of research studies [6][7][8][9][10][11][12][13][14]. Some of them [11][12][13][14] investigated the behavior of steel structures, in which the prestressing cables are positioned within tubular sections, hence providing a practical means of prestressing the surrounding tubular member, while also protecting the prestressing cables.…”

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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Dynamic behaviour of steel–concrete composite under-deck cable-stayed bridges under the action of moving loads

Cited by 24 publications

References 17 publications

Prestressed cold-formed steel beams: Concept and mechanical behaviour

Prestressed cold-formed steel beams: Concept and mechanical behaviour

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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