Numerical study on the flexural performance of precast segmental concrete beams with unbonded internal steel tendons

Le, Tan D.; Pham, Thong M.; Hao, Hong

doi:10.1016/j.conbuildmat.2020.118362

Cited by 37 publications

(18 citation statements)

References 31 publications

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“…For the internal unbonded tendons, the friction forces between the unbonded tendons and the adjacent concrete are smaller than tendon traction [16,34]. Therefore, the frictionless assumption is usually adopted for unbonded tendons to simplify analysis [28][29][30]. With this assumption, internal unbonded tendons behave as a slipping cable with equal traction anywhere between two anchorages.…”

Section: Modeling Schemesmentioning

confidence: 99%

“…Compared with monolithic beams [20,[24][25][26][27], the PSCB-IUCFRP system showed more complicated flexural behaviors, including the discontinuous behaviors of open joints and the unbonded phenomenon of the internal unbonded CFRP tendons. Le et al [28] and Tran et al [29] conducted the only numerical model for the PSCB-IUCFRP. In their models, concrete segments and internal tendons were modeled using the 3D solid finite elements (FE) model.…”

Section: Introductionmentioning

confidence: 99%

“…Previous tests [16,34] showed that the friction between the unbonded tendons and surrounding concrete is usually small. For simplification, we neglect the friction effects in this work and assume that the traction of the internal unbonded tendon is constant between the anchorages [28][29][30].…”

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confidence: 99%

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Numerical Model for Flexural Analysis of Precast Segmental Concrete Beam with Internal Unbonded CFRP Tendons

et al. 2022

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A new construction scheme was recently developed for precast segmental concrete beams by replacing steel tendons with internal unbonded carbon-fiber-reinforced polymer tendons. The discontinuous behaviors of the opening joints and unbonded phenomenon of tendons made their flexural behaviors more complicated than those of monolithic beams and members with bonded tendons. Currently, the knowledge on the structural performance of precast segmental concrete beams with internal unbonded carbon-fiber-reinforced polymer tendons is still limited. An efficient numerical model is urgently needed for the structural analysis and performance evaluation of this new construction scheme. In this paper, a new beam–cable hybrid model was proposed accounting for the mechanical behaviors of open joints and unbonded tendons. The numerical model was implemented in the OpenSees software with the proposed modeling method for joint elements and a newly developed element class for internal unbonded tendons. The effectiveness of the proposed model was verified by comparisons against two simply supported experimental tests. Then, the numerical model was employed to evaluate the flexural performance of a full-scale bridge with a span of 37.5 m. Compared with the precast segmental concrete beam with external steel tendons, the scheme with internal unbonded carbon-fiber-reinforced polymer tendons significantly improved the flexural capacity and ductility by almost 54.6% and 8.9%, respectively. The span-to-depth ratio and prestressing reinforcement ratio were the main factors affecting the flexural behaviors. With the span-to-depth ratio increasing by 23%, the flexural capacity decreased by approximately 38.6% and the tendon stress increment decreased by approximately 15.7%. With the prestressing reinforcement ratio increasing by 65.4%, the flexural capacity increased by 88.7% and the tendon stress increment decreased by approximately 25.2%.

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Section: Modeling Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Model for Flexural Analysis of Precast Segmental Concrete Beam with Internal Unbonded CFRP Tendons

et al. 2022

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“…Since connections show different behaviour under different loadings and conditions, it is best to formulate the problem in a numerical approach using Finite Element software. This will help in stimulating and understanding the flexural behaviour of the connection [4]. Therefore, this study presents a numerical approach to stimulating and understanding the behaviour of billet connector in precast beam to column connection.…”

Section: Introductionmentioning

confidence: 99%

Performance of Precast Beam to Column Connection With Billet Connector Using FEM

Almohagry¹,

Ibrahim²,

Athar³

et al. 2021

Proceedings of the 4th International Conference on Sustainable Innovation 2020–Technology, Engineering and Agriculture (ICoSITE

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In precast concrete structures, connections play an important role in ensuring the safety of the structure. Current design practice in structural analysis assumes the connection as pinned or rigid. However, this cannot be relied upon for safety against collapse because during service the actual connection may react differently by rotating and, consequently, deviating from the desired response for what it was designed for. This paper investigates the performance of a precast beam-to-column connection with billet connector using three-dimensional non-linear finite element model in Finite Element Analysis (FEA) software, Abaqus. The material properties of concrete were defined using a non-linear concrete damage plasticity model (CDPM). This model was used to predict the connection behavior under monotonic and cyclic loading when different parameters were set such as dilation angle, interaction properties and friction factor. Furthermore, the moment resistance and failure mechanism of the connection were investigated. The fixity factor was calculated, and the connection was classified using the 'beam line' method through investigating the moment-rotation (M-ϕ) and the response of the beam. The FE analysis was also validated against experimental results. This process was carried out to obtain the most efficient method of designing a precast connection in terms of maximum displacement, stress generated, strength, hysteretic behaviour, and stiffness degradation.

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“…32 A parametric finite element analysis (FEA) was also carried out to investigate the influence of the prestressing levels on the flexural response of beams with unbonded tendons, revealing that higher effective prestress leads to higher load-carrying capacity at ultimate stage even if with lower deflection (i.e., reduced ductility). 33 Some attempts to simplify the complex, member-dependent, stress-strain distribution along unbonded tendons assuming them as constants were also proposed using both FEs 34,35 or applied elements (AEs) 36 methods. However, to the authors' best knowledge, a comprehensive and comparative multidimensional numerical study on the flexural behavior of PC girders is still missing.…”

mentioning

confidence: 99%

Multidimensional nonlinear numerical simulation of post‐tensioned concrete girders with different prestressing levels

Galano,

Losanno,

Miluccio

et al. 2023

Structural Concrete

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Most of the Italian infrastructures have been built since the mid‐twentieth century. Prestressed concrete (PC) has been widely used, especially for bridges and viaducts. These structures have proved effective over time, but their performance could be affected by degradation phenomena (i.e., corrosion of the tendons and residual prestressing) or construction defects (i.e., grouting of the ducts), which need to be accurately modeled. This paper focuses on the flexural response of two reduced‐scale, posttensioned, PC bridge girders, prestressed with two different jacking forces and tested under four‐point bending configuration. Four multidimensional numerical models were developed to simulate the experimental behaviors of the selected specimens, using two alternative computational strategies, namely, the finite element method (FEM) and applied element method (AEM). Three FEM modeling were considered, ranging from one‐dimensional lumped‐plasticity models to two‐dimensional and three‐dimensional (3D) spread‐plasticity models. Besides, 3D AEM models were developed into another software package. The accuracy and the computational costs of the two numerical strategies are discussed in this paper. Also, the main features of each numerical modeling technique are addressed, including comparisons between numerical and experimental global response data as well as the statistical characterization of the model error. Based on these different features, the authors also suggest the most suitable numerical strategy for future studies on PC girders.

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Numerical study on the flexural performance of precast segmental concrete beams with unbonded internal steel tendons

Cited by 37 publications

References 31 publications

Numerical Model for Flexural Analysis of Precast Segmental Concrete Beam with Internal Unbonded CFRP Tendons

Numerical Model for Flexural Analysis of Precast Segmental Concrete Beam with Internal Unbonded CFRP Tendons

Performance of Precast Beam to Column Connection With Billet Connector Using FEM

Multidimensional nonlinear numerical simulation of post‐tensioned concrete girders with different prestressing levels

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