Strengthening of RC walls using externally bonding of steel strips

Altın, Sinan; Kopraman, Yağmur; Baran, Mehmet

doi:10.1016/j.engstruct.2012.12.022

Cited by 34 publications

(12 citation statements)

References 15 publications

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“…Group C: Four specimens of steel strip reinforced concrete shear walls tested in [13] at scale of ½ are modeled in different arrangements of steel strips in ABAQUS. All specimens are 1000 mm in length, 100 mm in width and 1500 mm in height.…”

Section: A Reinforced Concrete Shear Walls Specimensmentioning

confidence: 99%

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Numerical Analysis of Carbon Fiber Reinforced Plastic (CFRP) Shear Walls and Steel Strips under Cyclic Loads Using Finite Element Method

Askarizadeh

Mohammadizadeh

2017

Eng. Technol. Appl. Sci. Res.

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Reinforced concrete shear walls are the main elements of resistance against lateral loads in reinforced concrete structures. These walls should not only provide sufficient resistance but also provide sufficient ductility in order to avoid brittle fracture, particularly under strong seismic loads. However, many reinforced concrete shear walls need to be stabilized and reinforced due to various reasons such as changes in requirements of seismic regulations, weaknesses in design and execution, passage of time, damaging environmental factors, patch of rebar in plastic hinges and in some cases failures and weaknesses caused by previous earthquakes or explosion loads. Recently, Fiber Reinforced Polymer (FRP) components have been extensively and successfully used in seismic improvement. This study reinforces FRP reinforced concrete shear walls and steel strips. CFRP and steel strips are evaluated by different yield and ultimate strength. Numerical and experimental studies are done on walls with scale 1/2. These walls are exposed to cyclic loading. Hysteresis curves of force, drift and strain of FRP strips are reviewed in order to compare results of numerical work and laboratory results. Both numerical and laboratory results show that CFRP and steel strips increase resistance, capacity and ductility of the structure.

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Section: A Reinforced Concrete Shear Walls Specimensmentioning

confidence: 99%

“…Three other specimens are determined (Specimen 2, Specimen 3 and Specimen 4). All three reinforced specimens have a layer reinforced by steel strips [13]. Table II shows 28-day resistance of concrete in all specimens.…”

Section: B Specifications Of Materialsmentioning

confidence: 99%

Numerical Analysis of Carbon Fiber Reinforced Plastic (CFRP) Shear Walls and Steel Strips under Cyclic Loads Using Finite Element Method

Askarizadeh

Mohammadizadeh

2017

Eng. Technol. Appl. Sci. Res.

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“…The technique of external bonding with steel strips was extended to RC walls subjected to earthquake loading by Altin et al [7]. Walls are provided with alignment of steel strips such as diagonal, lateral and a combination of lateral and vertical.…”

Section: 3mentioning

confidence: 99%

Performance of Partially Damaged Squat Shear Walls under Reversed Cyclic Loading

Sambhana¹,

Gangolu²

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Reinforced concrete (RC) shear walls can resist lateral loads effectively in a high rise structural system. Squat shear walls are encountered in nuclear power plant structures to resisting earthquake forces. This paper reports on some experimental investigations on behaviour of RC squat shear walls partially damaged under quasi-static loading (monotonic and reversed cyclic). Six large scale RC squat shear walls with boundary elements were tested to failure. Important variable of this study include height of wall maintaining all other parameters constant. Three sets of shear walls, containing two in each set, with aspect ratios 1.5, 1.25 and 1.0. In each set one wall was tested under monotonic lateral load, whereas the second walls with displacement reversals under lateral push and pull. These walls were tested under quasi-static loading up to failure. The tested shear walls with partial cracking were repaired and again subjected to above loading. The repair methodology involves removal of damaged concrete, straightening of steel bars (no rupture of reinforcement) and filling of cracks with cement grout. Testing of repaired shear walls was terminated after significant strength loss and deterioration in subsequent cycles. Load vs. displacement hysteresis loops, mode of failure, and crack pattern and overall response of the shear walls have been described. The seismic performance of all the shear walls has been analysed in terms of shear strength, stiffness degradation and ductility. Shear walls showed significant increase in ultimate lateral load at small aspect ratio. At small aspect ratios, shear walls exhibited brittle shear failure with horizontal cracking in the web.

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“…So far, the type of China's housing structure is still dominated by RC structure [1], a large proportion of which has a history of over 30-40 years. ese houses need to be tested and strengthened for various reasons, such as poor construction quality, improper use, changing the usage of houses, or adding layers. In addition, more and more homes will need to be tested and strengthened over time [2]. RC structures are generally strengthened for bearing members including RC columns, RC beams and foundations, etc.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Zhou

Wang

et al. 2019

Advances in Civil Engineering

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Based on a practical project, the construction method of circular reinforced concrete (RC) columns strengthened with externally wrapped steel plates was introduced in this paper. In order to study the bearing capacity and seismic performance of circular RC columns after strengthening, a formula for calculating the bearing capacity of circular RC columns strengthened with externally wrapped steel plates was derived, with reference to the Code for Design of Strengthening Concrete Structure. Through ABAQUS software, the vertical monotone static loading analysis and the horizontal low-cyclic reversed loading analysis were carried out, respectively, before and after the strengthening of the full-size RC columns in this project. The results showed that the bearing capacity of the normal section of the RC column after strengthening was about 80% higher than that before strengthening, and the results of FEM software were in accord with the calculation results of theoretical formula to some degree. Under horizontal low-cyclic reversed loading, the columns after strengthening had both plumper hysteresis curves and higher ductility factors and equivalent viscous damping coefficient than those before strengthening, indicating the energy dissipation capacity, plastic deformation capacity, and seismic performance of the RC columns after strengthening were all obviously improved.

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Strengthening of RC walls using externally bonding of steel strips

Cited by 34 publications

References 15 publications

Numerical Analysis of Carbon Fiber Reinforced Plastic (CFRP) Shear Walls and Steel Strips under Cyclic Loads Using Finite Element Method

Numerical Analysis of Carbon Fiber Reinforced Plastic (CFRP) Shear Walls and Steel Strips under Cyclic Loads Using Finite Element Method

Performance of Partially Damaged Squat Shear Walls under Reversed Cyclic Loading

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

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