Rapid Repair of Earthquake-Damaged RC Columns with Prestressed Steel Jackets

Fakharifar, Mostafa; Chen, Genda; Wu, Chenglin; Shamsabadi, Anoosh; ElGawady, Mohamed A.; Dalvand, Ahmad

doi:10.1061/(asce)be.1943-5592.0000840

Cited by 64 publications

(28 citation statements)

References 14 publications

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“…Other researchers concentrated on the combination of the different jacketing methods. The prestressed steel jacketing (PSJ) was developed by Fakharifar et al [17] for rapid and costeffective repair of severely damaged circular RC columns. The results showed that the PSJ successfully restored the ultimate stress and displacement ductility of the columns, but only limitedly restored the initial stiffness of the column by 84% of the as-built column.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Tang

Sun

2018

International Journal of Polymer Science

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The seismic performance of the bridge column, such as pier or pile, is a time-dependent property which may decrease in resistance to the deterioration or natural hazards along the structure's service life. The most effective strengthened method for degraded bridge columns is the jacketing method, which has been widely developed and investigated through numerous studies since the 1980s. This paper presented a modeling method, as well as a comprehensive parametric study, on seismic performance of bridge columns strengthened by a newly developed strengthening method with prestressed precast concrete panels and fiber-reinforced polymer reinforcements (PPCP-FRP). A modeling method of bridge columns strengthened with PPCP-FRP was first presented and validated with test results. The influence of design parameters, such as axial load ratio, equivalent FRP reinforcement ratio rate (EQFRR), expansion ratio, and shear span ratio of strengthened columns, were then further evaluated in terms of lateral load capacity, ductility, energy dissipation, lateral stiffness, and residual displacement of strengthened columns. The peak load of strengthened columns increases with the increasing of EQFRR due to the unique failure model of strengthened columns characterized by the fracture of FRP bars. The initial stiffness of strengthened columns increased by 300% with the increasing of expansion ratio by 45%, and a stable postyield stiffness stage was obtained by most strengthened columns in analysis. The residual displacement of strengthened columns decreases rapidly with the increasing of EQFRR, which indicated that a better repairability could be achieved by the strengthened column with a relatively high EQFRR.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Tang

Sun

2018

International Journal of Polymer Science

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“…The circular steel tube reinforcement method (as shown in Figure 1) has developed rapidly in recent decades [1][2][3][4][5][6][7][8][9][10][11], which origins in the application of cylinder columns. Concrete reinforcement using a circular steel tube can improve the bearing capacity of the concrete column as well as ductility.…”

Section: Introductionmentioning

confidence: 99%

“…The literature relevant to the circular steel tube reinforcement method focuses on the axial compression bearing capacity [1][2][3][4][5][6][7][8] and seismic performance [9][10][11]. It is concluded that (1) the method gives rise to the shear bearing capacity of the concrete column.…”

Section: Introductionmentioning

confidence: 99%

“…Unified Solution of Axial Bearing Capacity. The bearing capacity N of the concrete column reinforced by the two-way prestressed semicircular steel plate consists of bearing capacities provided by four parts: steel tube, outer-layer concrete, core concrete, and longitudinal reinforcement, namely,N = N 1 + N 2 + N 3 + N 4 13Equations (3), (6), (10),(11), and (12) are substituted into (13), and after organization, the unified solution of the axial…”

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confidence: 99%

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Using Two‐Way Prestressed Semicircular Steel Plate for Construction of Reinforced Concrete Cylinder Column

2018

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A concrete column has a significant influence on constructions because the component withstands the major weight of the whole structure. However, the ordinary concrete column has limited capacity to resist to multiaxial loadings. Since steel plate is one of the most common materials used in construction, concrete reinforced with steel plates based on prestressing reinforcement technology would be a directly applicable solution to the enhancement of mechanical property. In this study, a new reinforcement method upon concrete cylinder column used a two-way prestressed semicircular steel plate, which has already been patented. The study firstly analyzed the stress-bearing situation of the short concrete column reinforced by a two-way prestressed semicircular steel plate. The considerable substitution effect of vertical prestressing force on the concrete column was explored. The multiple restriction effects of horizontal prestressing force, semicircular steel plate, and stirrup were examined. Thereby, the calculation model was derived for the prestressed structure. Secondly, the formula was verified by experiments with close agreements. The result indicated that a unified strength theory was applicable to the theoretical calculation for short concrete column reinforced with a prestressed semicircular steel plate under axial compression, providing the foundation for analytical computation of prestressed semicircular steel plate-reinforced concrete column structures.

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“…Concrete-filled steel tube (CFST) and concrete-filled FRP tube (CFFT) column systems are the two most common types of CFTs that have been investigated at both member and system level ( [3][4][5][6][7][8][9][10][11][12][13][14][15]). CFT system demonstrate remarkable properties in terms of enhanced structural performance and project economy/constructability [3,[8][9][10][11][12][16][17][18][19][20][21][22][23][24][25][26][27]. Some studies (e.g., [2,17,28,29]) have incorporated the additional confinement provided by FRP wraps in the CFST system, in which the CFST is confined by FRP jacket.…”

Section: Introductionmentioning

confidence: 99%

FRP-confined concrete filled PVC tubes: A new design concept for ductile column construction in seismic regions

Fakharifar

Chen

2017

Construction and Building Materials

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In their recent work [1], authors have introduced and validated a new ductile design concept of confined concrete-filled polyvinyl-chloride tubular (CCFPT) columns through experimental and analytical studies. Confinement was provided with the use of a polyvinylchloride (PVC) tube and fiber-reinforced polymer (FRP) wrappings or FRP with a sandwiched layer of foam to enhance impact energy reduction due to potential FRP rupture and PVC fracture. In the present paper, additional flexural tests on CCFPT columns were undertaken to further investigate the structural behavior of the proposed system for column construction in seismic regions. Axial and flexural behavior of CCFPT columns was investigated with compressive and flexural tests, respectively, and compared with those of their corresponding concrete-filled polyvinyl-chloride tubular (CFPT) and FRP-wrapped (FW) columns. Test results obtained from 152×305 mm (6×12 in.) stub columns under axial loads and 152×1524 mm (6×60 in.) flexural beams under four-point loads indicated that the CCFPT columns can significantly enhance strength over the CFPT columns and enhance ductility over the FW columns. The transverse confining pressure from FRP wrapping and the interface property between the FRP and PVC proved critical in CCFPT design. Furthermore, the idea of introducing a cushioning foam layer between FRP layers and PVC to lessen the brittleness of FRP rupture in seismic regions proved effective.

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Rapid Repair of Earthquake-Damaged RC Columns with Prestressed Steel Jackets

Cited by 64 publications

References 14 publications

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Numerical Study on Seismic Behavior of Underwater Bridge Columns Strengthened with Prestressed Precast Concrete Panels and Fiber-Reinforced Polymer Reinforcements

Using Two‐Way Prestressed Semicircular Steel Plate for Construction of Reinforced Concrete Cylinder Column

FRP-confined concrete filled PVC tubes: A new design concept for ductile column construction in seismic regions

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