Retrofit of Reinforced Concrete Columns Using Partially Stiffened Steel Jackets

Xiao, Yan; Wu, Hua

doi:10.1061/(asce)0733-9445(2003)129:6(725)

Cited by 130 publications

(39 citation statements)

References 5 publications

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“…According to Xiao and Wu (2003), when ductility is the main factor in repair and rehabilitation of a specific member, the steel jacketing method is most efficient. The drawbacks of using steel jacketing include the quality assurance required with welding to ensure an adequate bond is created with the concrete interface.…”

Section: Review Of Current Retrofitting Techniquesmentioning

confidence: 99%

Active confinement of weakened concrete columns

Holmes¹,

Niall²,

O’Shea³

2014

Mater Struct

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Section: Review Of Current Retrofitting Techniquesmentioning

confidence: 99%

Active confinement of weakened concrete columns

Holmes¹,

Niall²,

O’Shea³

2014

Mater Struct

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“…The analytical model of confining stress of external steel collars through combined bending and axial actions is adopted from Xiao and Wu [15]. The development as well as necessary modifications are further described in the following sections.…”

Section: Proposed Analytical Modelmentioning

confidence: 99%

“…This fact is also observed in conventionally confined concrete using internal transverse reinforcement. According to Xiao and Wu [15], external steel collars provide the confining pressure through combined bending and axial mechanism. This is different from the assumption for transverse reinforcement which only depends on axial action because of the relatively small bending stiffness.…”

Section: Development Of the Modelmentioning

confidence: 99%

“…Commonly, confining stress in columns is provided by conventional transverse reinforcement (stirrups). Up to present, many experimental and analytical studies have been conducted to investigate the effects of confinement [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These studies covered circular and square column sections.…”

Section: Introductionmentioning

confidence: 99%

“…However, for square and rectangular columns, providing effective confining stress by external retrofit is not an easy task. Some experimental and only a few analytical studies are found to address this problem [15][16][17]. Similar to conventional internal confinement, the non-uniform stress distribution (Figure 2) is also experienced by the square sections confined by external steel collars ( Figure 3).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Compressive Strength Prediction of Square Concrete Columns Retrofitted with External Steel Collars

Pudjisuryadi¹,

Tavio²

2013

ced

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Transverse confining stress in concrete members, commonly provided by transverse reinforcement, has been recognized to enhance strength and ductility. Nowadays, the confining method has been further developed to external confinement approach. This type of confinement can be used for retrofitting existing concrete columns. Many external confining techniques have been proven to be successful in retrofitting circular columns. However, for square or rectangular columns, providing effective confining stress by external retrofitting method is not a simple task due to high stress concentration at column's corners. This paper proposes an analytical model to predict the peak strength of square concrete columns confined by external steel collars. Comparison with the experimental results showed that the model can predict the peak strength reasonably well. However, it should be noted that relatively larger amount of steel is needed to achieve comparable column strength enhancement when it is compared with those of conventional internally-confined columns.

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Experimental study on retrofit of school buildings by adding sandwich columns to partition brick walls

Chung

Lien

2011

Earthq Engng Struct Dyn

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Thousands of buildings were damaged by the devastating Chi-Chi earthquake on September 21, 1999. Of all the public buildings, school buildings are the most vulnerable to earthquake damage, and the retrofitting of existing school buildings becomes a stringent issue. In addition to cost effectiveness, the impact of retrofitting methods on the functions of the school buildings needs to be considered. This paper therefore proposes the retrofitting of school buildings by adding sandwich columns onto partition brick walls. The sandwich column is divided into two parts and is added to the two sides of the partition brick wall held with pairs of U-shaped bars. The retrofit does not require the removal of windows or doors in the longitudinal direction making the proposed method cost effective and minimizes the impact on the function of the school buildings. Five full-scale specimens without and with retrofitting were designed and fabricated for testing based on the partition brick wall frames of the existing school buildings. The specimens were subjected to cyclic loading in the out-of-plane direction through a loading frame so that the columns deformed with double curvatures. The experimental results verified the feasibility of the proposed retrofit method. The data showed that the lateral strength of the retrofitted specimen doubled that which was not and that the residual strength of the retrofitted specimen was just as high as the ultimate strength of the specimen without retrofitting. The analytical results in lateral strength yielded conservative figures compared with experimental measurements. lot of schools and they are well distributed across the population. Therefore, the schools' urgent need for seismic performance evaluations and enhancement works is evident. In order to tackle the seismic deficiency problem in Taiwanese school buildings, a strategy was proposed to upgrade the seismic performance of school buildings through a screening process which involves a simple survey, a preliminary evaluation, a detailed evaluation and a retrofit design and implementation. The proposed strategy is cost effective given the limited resources [1].Concrete jackets were adopted for the seismic retrofit of 2/3-scale non-ductile reinforced concrete short columns [2]. Upon testing under cyclic loading, the columns repaired or retrofitted by concrete jackets were seen to be much stiffer and stronger than the original columns. Rodriguez retrofitted and repaired four 7/8-scale reinforced concrete column units with concrete jackets [3]. Variations in axial loads, design-yielding stress and the ratio between longitudinal reinforcements and spacing of transverse reinforcements were studied. Cyclic load testing showed that the repaired or retrofitted units had improved the stiffness, strength and ductility. Stoppenhagen tested a 2/3scale frame of two bays and two stories repaired with a concrete jacket [4]. The cyclic loading test results showed that the frame was successfully repaired with the concrete jackets and that failure mode o...

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Retrofit of Reinforced Concrete Columns Using Partially Stiffened Steel Jackets

Cited by 130 publications

References 5 publications

Active confinement of weakened concrete columns

Active confinement of weakened concrete columns

Compressive Strength Prediction of Square Concrete Columns Retrofitted with External Steel Collars

Experimental study on retrofit of school buildings by adding sandwich columns to partition brick walls

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