Upgrading steel I-beams using local post-tensioning

Taoum, Assaad; Jiao, Hui; Holloway, DS

doi:10.1016/j.jcsr.2015.06.012

Cited by 10 publications

(16 citation statements)

References 26 publications

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“…The load–deformation relationship, strains in the concrete flange and the steel beam, and types of mode failure were covered by this analysis. Taoum et al (2015) investigated the behavior of steel beams stiffened with locally prestressed reinforcing steel rebars by testing seven beams under three-point bending. The reinforcing rebars were anchored to the both ends of the beam and prestressed to increase the beam stiffness and ultimate strength.…”

Section: Introductionmentioning

confidence: 99%

Parametric study for post-tensioned composite beams with external tendons

El‐Zohairy

Salim

2017

Advances in Structural Engineering

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Strengthening of bridge superstructures composite beams with external post-tensioned tendons is a good technique for strengthening the existing structures. In this study, a numerical model is illustrated to study the nonlinear simulation of composite beams stiffened with externally post-tensioned tendons. The accuracy of the developed numerical model is validated using comparisons between the numerical and existing test data. The influence of various strengthening parameters is investigated, which include draped versus straight tendons, tendon length, the effect of post-tensioning on reinstating the flexural behavior of an overloaded beam, tendon eccentricity, and the degree of shear connection. A good agreement between the proposed model and the test data is obtained. The results demonstrate that at the same tendon eccentricity, the trapezoidal profile shows better behavior for the strengthened beams. However, more ductility is obtained when using the straight tendon profile. Applying post-tensioning through the beam of full length helps to reduce the creation of fatigue cracks, which always start at stress raisers, and subsequently increases the fatigue life of the composite beam. Also, the external post-tensioning effectively maintains the flexural behavior of the overloaded strengthened beam after unloading in comparison to the un-strengthened beam. It is observed that 80% degree of shear connection or higher is recommended to obtain the desired performance of the external post-tensioning force for strengthening composite beams.

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Section: Introductionmentioning

confidence: 99%

Parametric study for post-tensioned composite beams with external tendons

El‐Zohairy

Salim

2017

Advances in Structural Engineering

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“…Given that the effect of post-tensioning using SMA tendons on beam behavior has not been studied so far, in order to provide the possibility of comparing the results it is assumed the tendons made of steel. Also, the properties corresponding to data reported by Taoum et al [30] are considered in validation analyses. Accordingly, the experimental results of I-shaped steel post-tensioned beams performed by Taoum et al [30] are used to verify the results from the present work because to this point, no study has been performed in post-tensioning of tapered steel beams.…”

Section: Results Verificationmentioning

confidence: 99%

“…Also, the properties corresponding to data reported by Taoum et al [30] are considered in validation analyses. Accordingly, the experimental results of I-shaped steel post-tensioned beams performed by Taoum et al [30] are used to verify the results from the present work because to this point, no study has been performed in post-tensioning of tapered steel beams. The control beam used in their study will be used in this study as well in order to provide comparability.…”

Section: Results Verificationmentioning

confidence: 99%

“…They investigated the effect of the various parameters of the tendons and the tendons separators on the structural characteristics of the composite beams. Taoum et al [30] applied local posttension on a steel beam and presented a method in order to reinforce metallic bridges, and I-shaped severely damaged beams. Their results showed that using local post-tension method causes an increase in loading capacity of the I-shaped metallic beam and both posttension methods (internal or external), ultimate load and yield of the tested beams in comparison with the control beam increase significantly.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

Hosseinnejad

Yaghin

Hosseinzadeh

et al. 2021

IJE

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The external post-tension technique is one of the best strengthening methods for reinforcement and improvement of the various steel structures and substructure components such as beams. In the present work, the load carrying capacity of the post-tensioned tapered steel beams with external shape memory alloy (SMA) tendons were studied. 3D nonlinear finite element method with ABAQUS software is used to determine the effects of the increase in the flexural strength, and the improvement of the load carrying capacity. The effect of the different parameters, such as geometrical characteristics and the post-tension force applied to the tendons were also studied in this research. The results revealed that the external posttension with SMA tendons in comparison with the steel tendons caused a significant improvement of the loading capacity. According to this, using SMA tendon for the reinforcement of the tapered beams resulted in a decrease in weight of these structures and as a consequence responded economic benefits in their application. This method can be used extensively for steel beams due to low executive costs and simplicity of the operation for post-tension.

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“…Similarly, when the support is strengthened, it will considerably affect the span and make the force complex. Although there are relevant studies on the local arrangement of prestressed steel bars, for example, Taoum et al (2015) carried out experimental studies on the performance of steel beams strengthened using locally prestressed reinforcing steel bars. Picard et al (2000) proposed the method of applying locally tensioned prestressed bars to concrete beams and discussed the internal force analysis of single-span statically indeterminate beams.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the flexural behavior of local prestressed steel–concrete composite continuous box beams

Zhang

Cao

et al. 2020

Advances in Structural Engineering

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The flexural bearing capacities of three composite continuous box beams with different prestressing degrees were tested and studied to investigate the influences of local prestressing bundles on the deflection, relative slip of interface, strain, and redistribution of the internal force of the steel–concrete composite continuous box beam. Results show that the arrangement of local prestress can not only improve the bending stiffness at the mid-span of the composite continuous box beam, but also significantly enhance the ductility. In the design process of the local prestressed composite continuous box beam, the influence of the slip at the middle support should be fully considered, and the deflection could not be taken as a control factor. The internal force redistribution of the local prestressed continuous box beam is lower than that of the ordinary continuous box beam, but it still has good plastic internal force redistribution. The number of prestressing bundles in the negative moment region is the main factor that affects the internal force redistribution of the middle support.

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Upgrading steel I-beams using local post-tensioning

Cited by 10 publications

References 26 publications

Parametric study for post-tensioned composite beams with external tendons

Parametric study for post-tensioned composite beams with external tendons

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

An experimental study on the flexural behavior of local prestressed steel–concrete composite continuous box beams

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