Finite-Element Modeling of Externally Posttensioned Composite Beams

El‐Zohairy, Ayman; Salim, Hani; Shaaban, Hesham; Mustafa, Suzan; Elshihy, Ashraf

doi:10.1061/(asce)be.1943-5592.0000756

Cited by 26 publications

(15 citation statements)

References 9 publications

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“…The concrete flange is idealized using a solid element, SOLID65, that is able to crack in tension and crush in compression. The slippage between the steel beam and the concrete flange is simulated using a nonlinear spring element, COMBINE39, located only at the shear connectors’ positions (El-Zohairy et al, 2015). The shank of the shear connectors is modeled by a beam element, BEAM23, which is directed to carry the axial load only.…”

Section: Fe Modelmentioning

confidence: 99%

“…A contact element, CONTAC178, is used to model the connection between the two surfaces of the concrete flange and the steel section along the composite beam length to avoid any penetration between the two surfaces. The normal stiffness of the contact element is defined as the weaker stiffness of the two surfaces in contact (El-Zohairy et al, 2015). A link element, LINK8, is used to model the post-tensioned tendons and the steel rebars.…”

Section: Fe Modelmentioning

confidence: 99%

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Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons

El‐Zohairy

Salim

Shaaban

et al. 2017

Advances in Structural Engineering

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Externally post-tensioned tendons can cause an initial compressive stress in steel-concrete composite sections at the hogging moment region, and then a part of the tensile stress in the concrete flange can be relieved. This study presents a detailed finite element analysis of the nonlinear flexural response of continuous steel-concrete composite beams strengthened with externally post-tensioned tendons. The initial post-tensioning force is introduced as an initial strain in the truss element that used to simulate the external tendons. The accuracy of the finite element model is validated using existing experimental works. The effects of tendon eccentricity, longitudinal steel rebar ratio, and initial post-tensioning force on the beam behavior are explored. Furthermore, deterministic and stochastic shrinkage effects are carried out to obtain the long-term random responses of the strengthened beams as well as unstrengthened beams. However, the ultimate capacity of the strengthened beam increases only by 8%, the cracked moment redoubles, and an affirmative behavior over the unstrengthened beams is obtained. Also, a rapid decay in the long-term deformation of continuous steelconcrete composite beams is obtained at the early age while a linear decrease in the remaining part of the age occurs.

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Section: Fe Modelmentioning

confidence: 99%

Section: Fe Modelmentioning

confidence: 99%

Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons

El‐Zohairy

Salim

Shaaban

et al. 2017

Advances in Structural Engineering

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“…Various mathematical models for nonlinear analysis of PSCC members have been developed by different investigators [4][5][6][7][8]. Many experimental, numerical and analytical works were performed for evaluating the structural response of simply supported PSCC members under positive bending [1,[9][10][11][12][13][14][15]. Results related to flexural behavior of such members under negative bending were also reported [2,3,16].…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of prestressed steel-concrete composite girders with external FRP or steel tendons

Lou

Karavasilis

2019

Journal of Constructional Steel Research

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The use of external FRP tendons instead of steel ones for prestressing steel-concrete composite girders is evaluated. A nonlinear model for prestressed steel-concrete composite (PSCC) girders is calibrated against experimental results. Numerical simulations are then performed on singe-span and two-span PSCC girders. The investigated variables are the tendon type and the prestress level. In particular, CFRP, AFRP and conventional prestressing steel tendons are compared for prestress levels ranging from 0 to 60%. The results demonstrate that the behavior of PSCC girders with CFRP and steel tendons is similar, while AFRP tendons result in lower ultimate load and higher deformation capacity. In addition, the influence of prestress level on the moment at the center support of continuous PSCC girders is marginal due to the presence of secondary moments. The study also shows that the influence of secondary moments on moment redistribution is less pronounced in PSCC girders with AFRP tendons than in PSCC girders with CFRP or steel tendons.

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“…Externally prestressed technique is an effective way to retrofit existing beams, which produces additional stresses in the direction that opposes to the external loads [1][2]. Externally prestressed beams possess many advantages such as large loading capacity [3], favorable fatigue and fracture behaviors [4], full use of materials and structural lightweight [5], ease in inspection and replacement of tendons [6], high redundancy and reliability [7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Although researches on the externally prestressed technique has been mature in concrete beams [10][11][12][13], composite steel-concrete beams [1][2][3][4][5][6][7][8][14][15][16][17] and concrete deep beams [18][19][20], those on prestressed steel deep beams are still scarce. More recently, Belletti [21] investigated the flexure of prestressed I-shaped steel beams and found that more deviators result in the higher prestressed force and more stability of beams.…”

Section: Introductionmentioning

confidence: 99%

Flexural behavior of steel deep beams prestressed with externally unbonded straight multi-tendons

Ren

Wang

et al. 2018

Thin-Walled Structures

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External prestressing is one of the most powerful techniques to retrofit and strengthen the existing beams and columns. In this paper, the flexural behavior of deep beam prestressed with multi-tendons is investigated under concentrated forces for both post-and pre-tensioning process. Solutions for displacements and stresses are achieved based on Timoshenko beam theory. Besides, a statically indeterminate system was established, and a compatibility condition between the beam and tendons was founded to solve the increase in tendon force in loading period in pretensioning. Verifications were performed in tables by applying Finite element analysis. Finally, parameter studies were carried out to examine the effects of tendon force and eccentricity on the flexure of beams. Numerical results were summarized into a series of curves indicating the distribution of warping stresses on flanges and the increases in subtendon forces.

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Finite-Element Modeling of Externally Posttensioned Composite Beams

Cited by 26 publications

References 9 publications

Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons

Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons

Numerical evaluation of prestressed steel-concrete composite girders with external FRP or steel tendons

Flexural behavior of steel deep beams prestressed with externally unbonded straight multi-tendons

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