Seismic Retrofit of Hollow Rectangular Bridge Columns

Mo, Y. L.; Yeh, Y.-K.; Hsieh, D. M.

doi:10.1061/(asce)1090-0268(2004)8:1(43)

Cited by 39 publications

(14 citation statements)

References 17 publications

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“…Similar behavior was reported from compression tests on rectangular concrete specimens wrapped with small amounts of FRP: the specimens showed softening after maximum strength, while increasing strength in the second branch was observed for relatively high amounts of FRP [e.g., Karabinis and Rousakis, 2003]. Looking at the global behavior of FRP-retrofitted hollow piers, Mo et al [2004] found good agreement between experimental and analytical results, assuming in the analytical calculations a concrete law similar to the one depicted in Figure 5. In particular, a confined-concrete law that considers an increased initial stiffness and strength compared to unconfined concrete and comprises a softening post-peak branch until a residual strength, was found to accurately simulate the experimental force-displacement behavior of a set of eight piers with a 0.5 × 0.5 m hollow The numerical results are further discussed with focus on characteristic values of the stress-strain curves, namely compressive, f cc , and residual strength, f cr , strain at peak stress, e cc , and softening stiffness.…”

Section: Effect Of Confinement Within the Cross-sectionsupporting

confidence: 67%

“…Only the case of a jacket applied on the flange is examined, as it is expected that a jacket will not provide effective confinement to the web, because of its length. The Tsionis [2004], the experimental data reported by Mo et al, [2004] corner of the cross-section was rounded at a radius in the order of 5 cm, as recommended for field applications. A parabolic concrete jacket with h j = 0.0 (no concrete jacket), h j = 0.05 m, h j = 0.10 m, h j = 0.15 m, and h j = 0.20 m was considered.…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

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Numerical Analysis of RC Bridge Piers with Rectangular Hollow Cross-section Retrofitted with FRP Jackets

Georgios

Pinto

2007

Journal of Earthquake Engineering

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The research presented in this article deals with the seismic retrofit of bridge piers with rectangular hollow cross-section using fiber-reinforced polymer (FRP) jackets. A two-level numerical approach that combines finite element method (FEM) analyses and fiber modeling is proposed. The FEM is used to study the effect of FRP jackets on the properties of concrete. The analyses show that the existing empirical laws for FRP-confined concrete are not suitable for piers with hollow crosssection, as the effect of confinement is not uniform within the cross-section and the stress-strain curves show softening after peak strength. Fiber modeling is used to study the global behavior of reinforced concrete piers with rectangular hollow cross-section wrapped with FRP jackets. To account for confinement, the properties of the concrete fibers are modified according to the results of the FEM analyses. The proposed method is validated against experimental results and used for an extensive parametric study. It is found that the effectiveness of jacketing is conditioned by the axial load, longitudinal reinforcement, and jacket dimensions. An empirical design equation is formulated on the basis of the numerical analyses.

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Section: Effect Of Confinement Within the Cross-sectionsupporting

confidence: 67%

Section: Description Of the Numerical Modelmentioning

confidence: 99%

Numerical Analysis of RC Bridge Piers with Rectangular Hollow Cross-section Retrofitted with FRP Jackets

Georgios

Pinto

2007

Journal of Earthquake Engineering

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“…Numerous studies involve the FRP retrofit of deficient reinforced concrete columns for seismic loads [39][40][41][42][43][44][45][46][47][48][49]. The effects of the FRP reinforcement length on the plastic hinge region and the drift capacity of FRP-retrofitted columns has been investigated [39].…”

Section: Strengthening Of Columns Subjected To Seismic Loadsmentioning

confidence: 99%

“…Similar seismic behavior was noticed for hollow rectangular bridge columns retrofitted with FRP sheets under axial and cyclic lateral loads. FRP sheets effectively improved the ductility factor and shear capacity of hollow rectangular bridge columns [42]. Stay-in-place FRP formwork has also been used as concrete confinement reinforcement for high and normal strength concrete columns under axial compression and lateral deformation reversals.…”

Section: Strengthening Of Columns Subjected To Seismic Loadsmentioning

confidence: 99%

FRP Composites Strengthening of Concrete Columns under Various Loading Conditions

2014

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This paper provides a review of some of the progress in the area of fiber reinforced polymers (FRP)-strengthening of columns for several loading scenarios including impact load. The addition of FRP materials to upgrade deficiencies or to strengthen structural components can save lives by preventing collapse, reduce the damage to infrastructure, and the need for their costly replacement. The retrofit with FRP materials with desirable properties provides an excellent replacement for traditional materials, such as steel jacket, to strengthen the reinforced concrete structural members. Existing studies have shown that the use of FRP materials restore or improve the column original design strength for possible axial, shear, or flexure and in some cases allow the structure to carry more load than it was designed for. The paper further concludes that there is a need for additional research for the columns under impact loading senarios. The compiled information prepares the ground work for further evaluation of FRP-strengthening of columns that are deficient in design or are in serious need for repair due to additional load or deterioration.

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“…Since the available references related to the seismic response of similar columns were very limited [e.g., Pinto et al, 2001a,b;Mo et al, 2004;Calvi et al, 2005] and related only to columns with transverse bars properly placed outside the longitudinal reinforcement, analytical, and experimental research into the seismic safety and strengthening of the above-described bridge was performed at the University of Ljubljana, and at the Slovenian National Building and Civil Engineering Institute.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Cyclic Flexural and Shear Response of the R. C. Hollow Box Columns of an Existing Viaduct

Isaković

Bevc

Fischinger

2008

Journal of Earthquake Engineering

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The cyclic response of R.C. hollow box columns, constructed as part of a typical single-column bent viaduct, built in the 1970's in Central Europe, was studied both experimentally and analytically. Moderate displacement ductility capacity (between 3 and 4) was observed regardless of the column construction details, which are nowadays considered inappropriate for seismic regions. Standard analytical flexural models correlated with the experimental results quite well. Shear strength was estimated using the two methods included in the EC8 standards, as well as the method developed at the University of California, San Diego. Quite different results were obtained. The most accurate was the third method.

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Seismic Retrofit of Hollow Rectangular Bridge Columns

Cited by 39 publications

References 17 publications

Numerical Analysis of RC Bridge Piers with Rectangular Hollow Cross-section Retrofitted with FRP Jackets

Numerical Analysis of RC Bridge Piers with Rectangular Hollow Cross-section Retrofitted with FRP Jackets

FRP Composites Strengthening of Concrete Columns under Various Loading Conditions

Modeling the Cyclic Flexural and Shear Response of the R. C. Hollow Box Columns of an Existing Viaduct

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