Behavior of Segmental Precast Posttensioned Bridge Piers under Lateral Loads

Dawood, Haitham M.; ElGawady, Mohamed A.; Hewes, Joshua T.

doi:10.1061/(asce)be.1943-5592.0000252

Cited by 123 publications

(47 citation statements)

References 11 publications

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“…Chou et al (2008) develop a hysteretic model for an unbonded precast segmental concrete filled steel tube (CFT). Dawood et al (2012) develop threedimensional finite element models to predict the monotonic behaviour of precast segmental bridge columns. The precast segmental columns are retrofitted and the lateral loading is repeated to investigate the accuracy of analytical results for predicting induced damages.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces

Nikbakht

Rashid

Hejazi

et al. 2014

Lat. Am. j. solids struct.

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Precast bridge columns have shown increasing demand over the past few years due to the advantages of such columns when compared against conventional bridge columns, particularly due to the fact that precast bridge columns can be constructed off site and erected in a short period of time. The present study analytically investigates the behaviour of self-centring precast segmental bridge columns under nonlinear-static and pseudo-dynamic loading at different prestressing strand levels. Self-centring segmental columns are composed of prefabricated reinforced concrete segments which are connected by central post-tensioning (PT) strands. The present study develops a three dimensional (3D) nonlinear finite element model for hybrid post-tensioned precast segmental bridge columns. The model is subjected to constant axial loading and lateral reverse cyclic loading. The lateral force displacement results of the analysed columns show good agreement with the experimental response of the columns. Bonded post-tensioned segmental columns at 25%, 40% and 70% prestressing strand stress levels are analysed and compared with an emulative monolithic conventional column. The columns with a higher initial prestressing strand levels show greater initial stiffness and strength but show higher stiffness reduction at large drifts. In the time-history analysis, the column samples are subjected to different earthquake records to investigate the effect post-tensioning force levels on their lateral seismic response in low and higher seismicity zones. The results indicate that, for low seismicity zones, post-tensioned segmental columns with a higher initial stress level deflect lower lateral peak displacement. However, in higher seismicity zones, applying a high initial stress level should be avoided for precast segmental self-centring columns with low energy dissipation capacity.

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Section: Introductionmentioning

confidence: 99%

A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces

Nikbakht

Rashid

Hejazi

et al. 2014

Lat. Am. j. solids struct.

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“…In the recent past considerable attention has been given to the use of self-centering precast concrete members and connections (Priestley et al 1999;Kurama et al 2002;Perez et al 2007;Kim and Choi 2015) and bridge construction (Dawood et al 2011;Kwan and Billington 2003;Youssf et al 2015aYoussf et al , 2016Kim et al 2012;Kim 2013). Self-centering behavior can be induced to the system by employing unbonded post-tensioning (PT) steel.…”

Section: Introductionmentioning

confidence: 99%

“…Three dimensional finite element (FE) modeling has been performed to predict the force-displacement behavior of UPTSCs (Dawood et al 2011;Ou et al 2007;Chou et al 2013;Sideris 2015;Youssf et al 2015b). Ou et al (2007) demonstrated that three dimensional FE modeling can be used to effectively predict the lateral response of UPTSCs.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study of Force–Displacement Behavior and Ductility of Self-centering Segmental Concrete Columns

Hassanli

Youssf

Mills

et al. 2017

Int J Concr Struct Mater

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In this study the behavior of unbonded post-tensioned segmental columns (UPTSCs) was investigated and expressions were proposed to estimate their ductility and neutral axis (NA) depth at ultimate strength. An analytical method was first employed to predict the lateral force-displacement, and its accuracy was verified against experimental results of eight columns. Two stages of parametric study were then performed to investigate the effect of different parameters on the behavior of such columns, including concrete compressive strength, axial stress ratio, diameter and height of the column, axial stress level, duct size, stress ratio of the PT bars, and thickness and ultimate tensile strain of fiber reinforced polymer wraps. It was found that the column's aspect ratio and axial stress ratio were the most influential factors contributing to the ductility, and axial stress ratio and column diameter were the main factors contributing to the NA depth of self-centering columns. While at aspect ratios of less than ten, as the axial stress ratio increased, the ductility increased; at aspect ratios higher than ten, the ductility tended to decrease when the axial stress ratio increased. Using the results of parametric study, nonlinear multivariate regression analyses were performed and new expressions were developed to predict the ductility and NA depth of UPTSCs.

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“…FRP-confinement increases the column's shear resistance and ductility because of its high tensile stiffness and strength [13,14]. FRP-confinement prevents concrete cover from spalling and increases the inelastic deformability of concrete in the potential plastic hinge region, which can increase the lateral displacement capacity of the column under seismic loads [15][16][17][18][19]. FRP shells provide stay-in-place formwork for new structures, and a protective shell against corrosion, weathering and chemical attacks [15,18,20].…”

Section: Introductionmentioning

confidence: 99%

Displacement and plastic hinge length of FRP-confined circular reinforced concrete columns

Youssf

ElGawady

Mills

2015

Engineering Structures

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a b s t r a c tConfinement of both existing and newly constructed reinforced concrete (RC) columns by fibre reinforced polymer (FRP) has been commonly used in recent decades. This is because of its ability to enhance the shear resistance and the ductility of the RC columns, which are the main parameters that govern the behaviour of RC columns under lateral loading. This paper presents a finite element (FE) model that was developed using the LS-DYNA program aimed at modelling the plastic hinge length (l p ) for FRP-confined RC columns. A FE parametric study was conducted to investigate the effect of FRP-confinement on l p . Empirical models were proposed to predict l p and the ultimate drift ratio (d u ) for FRP-confined RC columns and the results were compared with similar previous models. The proposed FE model was able to predict the plastic hinge region and l p value which can provide a simple way for designers to investigate the behaviour of FRP-confined columns during the design process. The proposed d u model reduced the average of errors (A) and standard deviation (SD) by 15.1%, 3.9%, respectively, compared to the best predictions by previous models.

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Behavior of Segmental Precast Posttensioned Bridge Piers under Lateral Loads

Cited by 123 publications

References 11 publications

A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces

A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces

Analytical Study of Force–Displacement Behavior and Ductility of Self-centering Segmental Concrete Columns

Displacement and plastic hinge length of FRP-confined circular reinforced concrete columns

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