Numerical Assessment on Bonded and Unbonded Prestressed Concrete Beams

Pang, Min; Liu, Xing; Dong, Yi; Lou, Tiejiong

doi:10.3390/buildings12101658

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Numerical models of PC structures with unbonded tendons were also proposed. Some authors compared the global response of PC beams with bonded and internally unbonded tendons, finding significant differences in terms of cracking pattern as well as ultimate load capacity and deflection 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 .…”

Section: Introductionmentioning

confidence: 99%

“…Some authors compared the global response of PC beams with bonded and internally unbonded tendons, finding significant differences in terms of cracking pattern as well as ultimate load capacity and deflection. 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.…”

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confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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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Numerical simulation of post‐tensioned concrete girders with defective grouting including local stress–strain tendons response

Galano,

Losanno,

Parisi

2024

Structural Concrete

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In internally post‐tensioned (PT) prestressed concrete (PC) structures, the prestressing system is usually made of high‐strength steel tendons embedded within concrete through either metallic or plastic ducts filled with cement grout or grease. Construction defects or degradation phenomena may lead to insufficient covering, exposing the prestressing steel to a harmful environment, potentially compromising the durability and load‐bearing capacity of the structure. Based on experimental tests on six 1:5 scaled PT specimens, this study presents accurate numerical simulations of four‐point bending tests on girders with unbonded and partially bonded tendons having different levels of initial prestress. Nonlinear finite element analyses (FEAs) were developed to reflect the friction‐type interaction mechanism between unbonded tendons and external ducts under increasing external load up to failure. Both global and local response parameters of the girders were studied validating numerical results against experimental findings. The numerical simulations provide insights on the stress pattern of unbonded and partially bonded strands, shedding light on the lower bearing capacity of defective girders compared to those with bonded tendons. Such findings contribute to a multi‐scale assessment and decision‐making framework for existing PT girders with defective grouting and low residual prestress levels, enhancing the understanding of their structural behavior and informing maintenance or retrofitting decisions.

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Strain, crack, stress and shape diagnostics of new and existing post-tensioned structures through distributed fibre optic sensors

Piątek,

Howiacki,

Kulpa

et al. 2023

Measurement

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Numerical Assessment on Bonded and Unbonded Prestressed Concrete Beams

Cited by 4 publications

References 24 publications

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

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

Numerical simulation of post‐tensioned concrete girders with defective grouting including local stress–strain tendons response

Strain, crack, stress and shape diagnostics of new and existing post-tensioned structures through distributed fibre optic sensors

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