Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading
The presence of the openings negatively effects on the strength of the beams where they act as a weak point because of the sudden change in the cross-section of the beam, so it becomes necessary to make strengthening for the beams to resist the effect of the openings and improve the strength of th...
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| Format: | Article |
| Language: | English |
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Tikrit University
2022-12-01
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| Series: | Tikrit Journal of Engineering Sciences |
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| Online Access: | https://tj-es.com/ojs/index.php/tjes/article/view/807 |
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| author | Israa kh. Jasim Mazin B. Abdulrahman Muyasser M. Jomaa'h Belal Alsubari Hayder Saadoon Abdulaali Shagea Alqawzai |
| author_facet | Israa kh. Jasim Mazin B. Abdulrahman Muyasser M. Jomaa'h Belal Alsubari Hayder Saadoon Abdulaali Shagea Alqawzai |
| author_sort | Israa kh. Jasim |
| collection | DOAJ |
| description |
The presence of the openings negatively effects on the strength of the beams where they act as a weak point because of the sudden change in the cross-section of the beam, so it becomes necessary to make strengthening for the beams to resist the effect of the openings and improve the strength of the beams, especially if the beams are subjected to repeated loads because of its effect on the strength at the failure. This paper studies the effect of the openings on the beams subjected to repeated loading and determine the extent of the increase in the strength of the beams when strengthened by the NSM technique. The experimental program included casting and testing fifteen RC beams, six of them considered as a control beams (three with strengthening and three without strengthening), and nine of them having circular transverse openings in different locations and strengthened by the NSM technique. Every type of beams is tested under three different types of loads (monotonic, constant repeated load, and incremental repeated load). All of the beams have the same dimensions and same reinforcement. The results show that all the beams with transverse openings are affected by repeated loads where the ultimate torque decreases and the twist angle increases. The existence of openings has a noted effect on reducing the ultimate torque, whereas the percentage of decrease in the ultimate torsional capacity reached 43.83% at the beam where the opening location is closest to the support (at the quarter of the clear span) and subjected to constant repeated loads, and the ultimate torque is significantly improved when the opening position is moved away from the supports. Also, the existence of strengthening reduced or eliminated the influence of openings on the ultimate torque compared with related non- strengthened beams.
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| first_indexed | 2024-03-13T00:09:22Z |
| format | Article |
| id | doaj.art-1f0dcf4d39cb41588d72a9dbca8c080c |
| institution | Directory Open Access Journal |
| issn | 1813-162X 2312-7589 |
| language | English |
| last_indexed | 2024-03-13T00:09:22Z |
| publishDate | 2022-12-01 |
| publisher | Tikrit University |
| record_format | Article |
| series | Tikrit Journal of Engineering Sciences |
| spelling | doaj.art-1f0dcf4d39cb41588d72a9dbca8c080c2023-07-12T19:21:51ZengTikrit UniversityTikrit Journal of Engineering Sciences1813-162X2312-75892022-12-0129410.25130/tjes.29.4.9Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated LoadingIsraa kh. Jasim0Mazin B. Abdulrahman1Muyasser M. Jomaa'h2Belal Alsubari3Hayder Saadoon Abdulaali4Shagea Alqawzai5Civil Engineering Department, College of Engineering, Tikrit University, Tikrit, Iraq.Civil Engineering Department/ Engineering College/Tikrit University Civil Engineering Department, College of Engineering, Tikrit University, Tikrit, Iraq.Department of Civil Engineering, Faculty of Engineering, Miami College of Henan University, Kaifeng, Henan, ChinaDepartment of Architecture, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor, MalaysiaSchool of Civil Engineering, Chongqing University, Chongqing 400045, China The presence of the openings negatively effects on the strength of the beams where they act as a weak point because of the sudden change in the cross-section of the beam, so it becomes necessary to make strengthening for the beams to resist the effect of the openings and improve the strength of the beams, especially if the beams are subjected to repeated loads because of its effect on the strength at the failure. This paper studies the effect of the openings on the beams subjected to repeated loading and determine the extent of the increase in the strength of the beams when strengthened by the NSM technique. The experimental program included casting and testing fifteen RC beams, six of them considered as a control beams (three with strengthening and three without strengthening), and nine of them having circular transverse openings in different locations and strengthened by the NSM technique. Every type of beams is tested under three different types of loads (monotonic, constant repeated load, and incremental repeated load). All of the beams have the same dimensions and same reinforcement. The results show that all the beams with transverse openings are affected by repeated loads where the ultimate torque decreases and the twist angle increases. The existence of openings has a noted effect on reducing the ultimate torque, whereas the percentage of decrease in the ultimate torsional capacity reached 43.83% at the beam where the opening location is closest to the support (at the quarter of the clear span) and subjected to constant repeated loads, and the ultimate torque is significantly improved when the opening position is moved away from the supports. Also, the existence of strengthening reduced or eliminated the influence of openings on the ultimate torque compared with related non- strengthened beams. https://tj-es.com/ojs/index.php/tjes/article/view/807NSM strengtheningreinforced concrete beamrepeated loadingsteel wire ropetorsiontransverse openings |
| spellingShingle | Israa kh. Jasim Mazin B. Abdulrahman Muyasser M. Jomaa'h Belal Alsubari Hayder Saadoon Abdulaali Shagea Alqawzai Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading Tikrit Journal of Engineering Sciences NSM strengthening reinforced concrete beam repeated loading steel wire rope torsion transverse openings |
| title | Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading |
| title_full | Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading |
| title_fullStr | Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading |
| title_full_unstemmed | Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading |
| title_short | Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading |
| title_sort | torsional behavior of rc beams with transverse openings strengthened by near surface mounted steel wire rope subjected to repeated loading |
| topic | NSM strengthening reinforced concrete beam repeated loading steel wire rope torsion transverse openings |
| url | https://tj-es.com/ojs/index.php/tjes/article/view/807 |
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