Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars
This study investigated the effectiveness of using near-surface mounted (NSM) steel bars to restore the shear strength of deep beams and deal with the presence of openings in slender beams. fourteen simply supported reinforced concrete beams were tested with varying shear span-to-depth ratios (a/h)...
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Erbil Polytechnic University
2023-12-01
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| Series: | Polytechnic Journal |
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| Online Access: | https://polytechnic-journal.epu.edu.iq/home/vol13/iss2/7 |
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| author | Hoshang Hayder Anwer Bahman Omar Taha |
| author_facet | Hoshang Hayder Anwer Bahman Omar Taha |
| author_sort | Hoshang Hayder Anwer |
| collection | DOAJ |
| description | This study investigated the effectiveness of using near-surface mounted (NSM) steel bars to restore the shear strength
of deep beams and deal with the presence of openings in slender beams. fourteen simply supported reinforced concrete
beams were tested with varying shear span-to-depth ratios (a/h) of 1.5 and 3.61, divided into two groups, and subjected to
a two-point load configuration. Some beams had openings at different positions, classified as large or small with opening
height ratios (ho/h) of 0.4 and 0.2, respectively. In the second group, six specimens were reinforced with nsm steel bars in
three stirrup configurations (square, diamond, and parallelogram) surrounding the openings. All specimens had a crosssection size of 100 mm £ 150 mm and a total length of 2000 mm. The results of the test indicated that having openings in
the beams led to reductions in ultimate load capacity for different beam types. Specimens reinforced with diamond
stirrup bars showed an increase in ultimate load capacity of up to 33.1%, while those with square and parallelogram
stirrup bars improved by up to 21.5% and 26.5%, respectively. Minor variations in bar diameter had slight effects on
ultimate load capacity, resulting in a 10% increase for the parallelogram scheme and 7% for the square scheme. The
reductions in ultimate load capacity due to openings were 45 % for large circular openings in the shear zone of deep
beams, 18.7 % for large circular openings in slender beams subjected to shear, 14.6 % for large circular openings affecting
both shear and flexural behavior and 19.5 % for small openings impacting shear and flexural behavior in slender beams. |
| format | Article |
| id | doaj-art-4bf1ea2d085e44ebae6d3104f7b852bf |
| institution | OA Journals |
| issn | 2707-7799 |
| language | English |
| publishDate | 2023-12-01 |
| publisher | Erbil Polytechnic University |
| record_format | Article |
| series | Polytechnic Journal |
| spelling | doaj-art-4bf1ea2d085e44ebae6d3104f7b852bf2025-08-20T02:17:56ZengErbil Polytechnic UniversityPolytechnic Journal2707-77992023-12-011324257https://doi.org/10.59341/2707-7799.1721Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel BarsHoshang Hayder Anwer0Bahman Omar Taha1Erbil Technical Engineering College, Erbil Polytechnic University, Erbil, IraqErbil Technical Engineering College, Erbil Polytechnic University, Erbil, IraqThis study investigated the effectiveness of using near-surface mounted (NSM) steel bars to restore the shear strength of deep beams and deal with the presence of openings in slender beams. fourteen simply supported reinforced concrete beams were tested with varying shear span-to-depth ratios (a/h) of 1.5 and 3.61, divided into two groups, and subjected to a two-point load configuration. Some beams had openings at different positions, classified as large or small with opening height ratios (ho/h) of 0.4 and 0.2, respectively. In the second group, six specimens were reinforced with nsm steel bars in three stirrup configurations (square, diamond, and parallelogram) surrounding the openings. All specimens had a crosssection size of 100 mm £ 150 mm and a total length of 2000 mm. The results of the test indicated that having openings in the beams led to reductions in ultimate load capacity for different beam types. Specimens reinforced with diamond stirrup bars showed an increase in ultimate load capacity of up to 33.1%, while those with square and parallelogram stirrup bars improved by up to 21.5% and 26.5%, respectively. Minor variations in bar diameter had slight effects on ultimate load capacity, resulting in a 10% increase for the parallelogram scheme and 7% for the square scheme. The reductions in ultimate load capacity due to openings were 45 % for large circular openings in the shear zone of deep beams, 18.7 % for large circular openings in slender beams subjected to shear, 14.6 % for large circular openings affecting both shear and flexural behavior and 19.5 % for small openings impacting shear and flexural behavior in slender beams.https://polytechnic-journal.epu.edu.iq/home/vol13/iss2/7rc beams, near surface-mounted, circular openings, strengthening schemes, shear strengthening |
| spellingShingle | Hoshang Hayder Anwer Bahman Omar Taha Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars Polytechnic Journal rc beams, near surface-mounted, circular openings, strengthening schemes, shear strengthening |
| title | Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars |
| title_full | Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars |
| title_fullStr | Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars |
| title_full_unstemmed | Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars |
| title_short | Strengthening of Reinforced Concrete Beams with Transverse Circular Openings Using Near Surface Mounting Steel Bars |
| title_sort | strengthening of reinforced concrete beams with transverse circular openings using near surface mounting steel bars |
| topic | rc beams, near surface-mounted, circular openings, strengthening schemes, shear strengthening |
| url | https://polytechnic-journal.epu.edu.iq/home/vol13/iss2/7 |
| work_keys_str_mv | AT hoshanghayderanwer strengtheningofreinforcedconcretebeamswithtransversecircularopeningsusingnearsurfacemountingsteelbars AT bahmanomartaha strengtheningofreinforcedconcretebeamswithtransversecircularopeningsusingnearsurfacemountingsteelbars |