Interface slip model for reinforced concrete columns strengthened with concrete jacketing

Çağlar, Naci; Sichko, Alexander; Sezen, Halil; Bicici, Erkan; Demir, Aydın; Farah, Ahmad Farhan

doi:10.7764/rdlc.19.2.180

Cited by 2 publications

(2 citation statements)

References 17 publications

(42 reference statements)

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“…A value of slip factor 0 shows that there is no bond at all while a value of 1 assumes that a perfect bond occurred and therefore the strain is fully compatible as in the monolithic case. Caglar et al, 2020 [20] proposed that the value of the interface slip coefficient () for various treatments on the interface ranges from 0.75 -1, depending on the method used for treatment, as shown in Table 2. If the initial load in the existing column is present, an initial strain can be imposed into the section to represent the effect of the initial load on the section.…”

Section: Figure 6 Strain Compatibility Of the Rc Jacketed Columnmentioning

confidence: 99%

Non Linear Analysis of Reinforced Concrete Column Strengthened by Reinforced Concrete Jacketing with High Strength Steel

Imron

Piscesa²,

Zacoeb³

2022

Journal of Civil Engineering

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This paper presents a nonlinear sectional analysis of reinforced concrete (RC) columns strengthened by RC jacketing, which also utilizes a high-strength reinforcing bar. A simple interface slip model was used to model the relationship between the old and the new concrete material. The initial axial load and bending moment are included in the analysis by introducing an initially prescribed strain before loading. The nonlinear sectional analysis was performed using an in-house MATLAB code utilizing the fiber-based method. The RC section was discretized with constant strain triangles (CST). The developed RC column model with jacketing was validated using the available test results in the literature. After the validation of the model was completed, the parametric study was carried out to gain an insight into the effect of using high strength reinforcing bar in the jacket structural element. The curvature and I10 ductility index were evaluated based on pure axial and constant axial loads with increased bending moment. From the validation of the model with the test result, the model predictions were satisfactorily showing a good fit, concluding that the developed MATLAB code can be used to evaluate RC columns strengthened with concrete jacketing. For the parametric study, the high strength reinforcing bar in RC column jacketing can increase the flexural, axial, and lateral load capacity but reduce the overall ductility. On the other hand, utilizing only high strength reinforcing bar for transverse reinforcement with tighter spacing resulted in higher ductility than if all the reinforcing bar was made from a highstrength one.

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Section: Figure 6 Strain Compatibility Of the Rc Jacketed Columnmentioning

confidence: 99%

Non Linear Analysis of Reinforced Concrete Column Strengthened by Reinforced Concrete Jacketing with High Strength Steel

Imron

Piscesa²,

Zacoeb³

2022

Journal of Civil Engineering

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“…Concrete jackets are recommended to increase the stiffness and capacity of reinforced concrete columns if we need to retrofit by more than 25% [15]. Slippage between the old and new concrete is one of the disadvantages of the concrete jacketing strengthening method to decrease the slippage, we can use rough surface or dwells which increase the coefficient of friction from 0.75 to 0.85 [16]. Concerning the column cracking before the strengthening stage has a significant effect on the capacity of strengthened column afterwards [17].…”

Section: Literature Reviewmentioning

confidence: 99%

Strengthening of Edge and Corner Columns using Concrete Jackets

et al. 2021

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Strengthening of columns using concrete jackets depends on friction at the interface between them. So strengthening of edge and corner columns in only one story needs a large cross section area due to the shortage of friction length which leads to architectural issues. This research aims to study strengthening the edge and corner columns using a concrete Jacket in more than one story which increases the friction area between the Jacket and the original column. As a result, the load transferred from original column to the jacket will be increased. Thirteen models were done using ANSYS program to study the effect of various factors on the Jacket capacity such as the number of strengthened floors, the Jacket type (two sides or three sides), and whether there were shear connectors or not. The results showed that in the case of the edge and corner columns, it is preferable to strengthen the column by making a concrete Jacket on at least two or three floors to increase the surface area, which leads to increase the friction and thus increases the capacity of the strengthened column by an acceptable percentage. The results of ANSYS models were compared with the Indian code IS 15988 (2013) and the results were shown differently because the code equations depend on the presence of a full bond between the concrete column and the Jacket, which does not occur, but rather the load is transferred by friction between the Jacket and the original column. Doi: 10.28991/cej-2021-03091716 Full Text: PDF

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Interface slip model for reinforced concrete columns strengthened with concrete jacketing

Cited by 2 publications

References 17 publications

Non Linear Analysis of Reinforced Concrete Column Strengthened by Reinforced Concrete Jacketing with High Strength Steel

Non Linear Analysis of Reinforced Concrete Column Strengthened by Reinforced Concrete Jacketing with High Strength Steel

Strengthening of Edge and Corner Columns using Concrete Jackets

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