Repair of reinforced concrete beams with adhesive Bonded steel plates
- Ngidi, Sandile Daniel, Dundu, Morgan
- Authors: Ngidi, Sandile Daniel , Dundu, Morgan
- Date: 2016
- Subjects: Flexural strength , Steel plates , Concrete beams
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/91849 , uj:20153 , Citation: Ngidi, S.D. & Dundu, M. 2016. Repair of reinforced concrete beams with adhesive Bonded steel plates.
- Description: Abstract:An investigation of the behaviour of reinforced concrete beams repaired with steel plates at its soffit is presented in this paper. Reinforced concrete beams were preloaded to 85 % of their ultimate capacity and subsequently repaired by bonding steel plates of different widths. Different widths of steel plates were used in order to determine the width-to-thickness ratio that will promote ductile behaviour. It is shown that strengthening of significantly cracked beams by bonding steel plates is possible and beams can be restored to stiffness and strength values superior to those of the original unplated beams.
- Full Text:
- Authors: Ngidi, Sandile Daniel , Dundu, Morgan
- Date: 2016
- Subjects: Flexural strength , Steel plates , Concrete beams
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/91849 , uj:20153 , Citation: Ngidi, S.D. & Dundu, M. 2016. Repair of reinforced concrete beams with adhesive Bonded steel plates.
- Description: Abstract:An investigation of the behaviour of reinforced concrete beams repaired with steel plates at its soffit is presented in this paper. Reinforced concrete beams were preloaded to 85 % of their ultimate capacity and subsequently repaired by bonding steel plates of different widths. Different widths of steel plates were used in order to determine the width-to-thickness ratio that will promote ductile behaviour. It is shown that strengthening of significantly cracked beams by bonding steel plates is possible and beams can be restored to stiffness and strength values superior to those of the original unplated beams.
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Impact of adhesive thickness on the capacity of the surface mounting steel plates strengthening techniques
- Authors: Olajumoke, A. , Dundu, M.
- Date: 2016
- Subjects: Steel plates , Epoxy , Strengthening
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/91863 , uj:20155 , Citation: Olajumoke, A. & Dundu, M. 2016. Impact of adhesive thickness on the capacity of the surface mounting steel plates strengthening techniques.
- Description: Abstract: Please refer to full text to view abstract
- Full Text: false
- Authors: Olajumoke, A. , Dundu, M.
- Date: 2016
- Subjects: Steel plates , Epoxy , Strengthening
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/91863 , uj:20155 , Citation: Olajumoke, A. & Dundu, M. 2016. Impact of adhesive thickness on the capacity of the surface mounting steel plates strengthening techniques.
- Description: Abstract: Please refer to full text to view abstract
- Full Text: false
Strength and ductility of simple supported r/c beams retrofitted with steel plates of different width-to-thickness ratios
- Authors: Rakgate, S. M. , Dundu, M.
- Date: 2018
- Subjects: Steel plates , Width-to-thickness ratio , Reinforced concrete beams
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/270599 , uj:28767 , Citation: Rakgate, S.M. & Dundu, M. 2018. Strength and ductility of simple supported r/c beams retrofitted with steel plates of different width-to-thickness ratios.
- Description: Abstract: The concept of strengthening reinforced concrete beams using epoxy-bonded steel plates (EBSP) is a well-known solution in structural engineering, however, there is little information about the effect of the width-to-thickness ratio of steel plates on the behaviour of steel-concrete composite beams. This paper presents an experimental study of the flexural behaviour of under-reinforced concrete beams, strengthened in flexure by externally-bonded steel plates (EBSP) of varying widthto- thickness ratios. A total of 23 reinforced concrete beams were tested; 6 beams in Series 1 tests and 17 beams in Series 2 tests. One beam in Series 1 tests and two beams in Series 2 tests were regarded as control specimens, whilst the remaining beams were strengthened with steel plates of different width-to-thickness ratios. In each group, the width of the bonded steel plate varied from 75 mm to 175 mm, in increments of 25 mm. The beams were tested as simply supported, under two-point static loadings until failure. From the experimental results, it was observed that the externally bonded steel plates led to substantial increase in flexural stiffness, which resulted in an increase in the capacity and cracking load of the strengthened beams and a decrease in vertical deflections and crack-widths, compared to the control beams. It was also found that the width-to-thickness ratio of steel plates as low as 12.5 can promote flexural yielding and extensive ductility in strengthened beams.
- Full Text:
- Authors: Rakgate, S. M. , Dundu, M.
- Date: 2018
- Subjects: Steel plates , Width-to-thickness ratio , Reinforced concrete beams
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/270599 , uj:28767 , Citation: Rakgate, S.M. & Dundu, M. 2018. Strength and ductility of simple supported r/c beams retrofitted with steel plates of different width-to-thickness ratios.
- Description: Abstract: The concept of strengthening reinforced concrete beams using epoxy-bonded steel plates (EBSP) is a well-known solution in structural engineering, however, there is little information about the effect of the width-to-thickness ratio of steel plates on the behaviour of steel-concrete composite beams. This paper presents an experimental study of the flexural behaviour of under-reinforced concrete beams, strengthened in flexure by externally-bonded steel plates (EBSP) of varying widthto- thickness ratios. A total of 23 reinforced concrete beams were tested; 6 beams in Series 1 tests and 17 beams in Series 2 tests. One beam in Series 1 tests and two beams in Series 2 tests were regarded as control specimens, whilst the remaining beams were strengthened with steel plates of different width-to-thickness ratios. In each group, the width of the bonded steel plate varied from 75 mm to 175 mm, in increments of 25 mm. The beams were tested as simply supported, under two-point static loadings until failure. From the experimental results, it was observed that the externally bonded steel plates led to substantial increase in flexural stiffness, which resulted in an increase in the capacity and cracking load of the strengthened beams and a decrease in vertical deflections and crack-widths, compared to the control beams. It was also found that the width-to-thickness ratio of steel plates as low as 12.5 can promote flexural yielding and extensive ductility in strengthened beams.
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Steel contribution effect on beams bonded with steel plates of different width-to-thickness ratios
- Rakgate, Sylvester M., Dundu, Morgan
- Authors: Rakgate, Sylvester M. , Dundu, Morgan
- Date: 2017
- Subjects: Steel plates , Steel contribution factor , RC beams
- Language: Engliah
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/248242 , uj:25800 , Citation: Rakgate, S. & Dundu, M. 2017. Steel contribution effect on beams bonded with steel plates of different width-to-thickness ratios.
- Description: Abstract: The concept of strengthening reinforced concrete (RC) beams using epoxy-bonded steel plates (EBSP) is a well-known solution in structural engineering. Experimental investigations conducted in the past has proved that strengthening RC beams with steel plates are the most efficient, effective, and costeffective technique of increasing the flexural performance of these elements. However, the focus has been on effect of the external bonded steel plate, and not on the effect of the overall steel contribution ratio on the behaviour of the strengthened beams. Several codes give the minimum reinforcement ratios for concrete beams in order to encourage/improve their flexural behaviour such as cracking and ductility failure. The purpose of this present study is to investigate the effect of the steel contribution ratio on the flexural behaviour of concrete beams strengthened on their tension face with epoxy bonded steel plate, using the experimental results obtained by various researchers in this field. The outcomes of strengthening RC beams are decrease in mid-span deflections, decrease in crackwidths, and increase in first crack load, and consequently increase in both serviceability load and ultimate load, thus making it to be the most feasible strengthening technique.
- Full Text:
- Authors: Rakgate, Sylvester M. , Dundu, Morgan
- Date: 2017
- Subjects: Steel plates , Steel contribution factor , RC beams
- Language: Engliah
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/248242 , uj:25800 , Citation: Rakgate, S. & Dundu, M. 2017. Steel contribution effect on beams bonded with steel plates of different width-to-thickness ratios.
- Description: Abstract: The concept of strengthening reinforced concrete (RC) beams using epoxy-bonded steel plates (EBSP) is a well-known solution in structural engineering. Experimental investigations conducted in the past has proved that strengthening RC beams with steel plates are the most efficient, effective, and costeffective technique of increasing the flexural performance of these elements. However, the focus has been on effect of the external bonded steel plate, and not on the effect of the overall steel contribution ratio on the behaviour of the strengthened beams. Several codes give the minimum reinforcement ratios for concrete beams in order to encourage/improve their flexural behaviour such as cracking and ductility failure. The purpose of this present study is to investigate the effect of the steel contribution ratio on the flexural behaviour of concrete beams strengthened on their tension face with epoxy bonded steel plate, using the experimental results obtained by various researchers in this field. The outcomes of strengthening RC beams are decrease in mid-span deflections, decrease in crackwidths, and increase in first crack load, and consequently increase in both serviceability load and ultimate load, thus making it to be the most feasible strengthening technique.
- Full Text:
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