Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes
This research seeks to examine punching shear reinforcements using various materials and techniques, then evaluate their effectiveness in order to increase the punching strength of flat-slab-column connections (FSCC). Additionally, a novel strengthening method utilizing FRP ropes was suggested and i...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523001146 |
| _version_ | 1827920604718694400 |
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| author | Mohamed H. Makhlouf Gamal Ismail Ahmed H. Abdel Kreem Marwa I. Badawi |
| author_facet | Mohamed H. Makhlouf Gamal Ismail Ahmed H. Abdel Kreem Marwa I. Badawi |
| author_sort | Mohamed H. Makhlouf |
| collection | DOAJ |
| description | This research seeks to examine punching shear reinforcements using various materials and techniques, then evaluate their effectiveness in order to increase the punching strength of flat-slab-column connections (FSCC). Additionally, a novel strengthening method utilizing FRP ropes was suggested and investigated. In this study, sixteen FSCC with cross sections of (1600 × 1600 × 150) mm and stub columns with a cross section of 200 × 200 mm and a total height of 700 mm extended outside both sides of the slab were constructed and tested. The transverse reinforcements ''stirrups'' have been varied in [material types - spacing - width- shapes]. The variables were: the materials used (steel, CFRPs ''carbon fiber reinforced polymers'', GFRPs ''glass fiber reinforced polymers''), spacing between stirrups (30, 50, 70 mm), the width of stirrups (140, 280 mm, and variable width stirrups as a novel scheme), and Case condition (internal reinforcement or external strengthening). The experimental results indicated a significant increase in punching shear resistance for the FSCC reinforced with stirrups by 25–85 % when compared to the control specimen. The results demonstrated the superiority of the CFRP as a strengthening material over any other materials, also, the novel scheme proposed in this study (variable width stirrups) gave the highest punching capacity compared to the identical case slabs. To validate the experimental results, a finite element analysis using ABAQUS/CAE6.14 was performed, and the results were very close to the experimental one. Moreover, theoretical equations have been verified on the experimental specimens. Finally, experimental, theoretical, and analytical results were compared. The novel scheme and CFRP stirrups were recommended to use for enhancing the punching shear resistance. |
| first_indexed | 2024-03-13T04:12:00Z |
| format | Article |
| id | doaj.art-e3c08f0c006640338dcd1c3186c8e8e3 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-13T04:12:00Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-e3c08f0c006640338dcd1c3186c8e8e32023-06-21T06:53:51ZengElsevierCase Studies in Construction Materials2214-50952023-07-0118e01935Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropesMohamed H. Makhlouf0Gamal Ismail1Ahmed H. Abdel Kreem2Marwa I. Badawi3Corresponding author.; Department of Civil Engineering, Benha Faculty of Engineering, Benha University, EgyptDepartment of Civil Engineering, Benha Faculty of Engineering, Benha University, EgyptDepartment of Civil Engineering, Benha Faculty of Engineering, Benha University, EgyptDepartment of Civil Engineering, Benha Faculty of Engineering, Benha University, EgyptThis research seeks to examine punching shear reinforcements using various materials and techniques, then evaluate their effectiveness in order to increase the punching strength of flat-slab-column connections (FSCC). Additionally, a novel strengthening method utilizing FRP ropes was suggested and investigated. In this study, sixteen FSCC with cross sections of (1600 × 1600 × 150) mm and stub columns with a cross section of 200 × 200 mm and a total height of 700 mm extended outside both sides of the slab were constructed and tested. The transverse reinforcements ''stirrups'' have been varied in [material types - spacing - width- shapes]. The variables were: the materials used (steel, CFRPs ''carbon fiber reinforced polymers'', GFRPs ''glass fiber reinforced polymers''), spacing between stirrups (30, 50, 70 mm), the width of stirrups (140, 280 mm, and variable width stirrups as a novel scheme), and Case condition (internal reinforcement or external strengthening). The experimental results indicated a significant increase in punching shear resistance for the FSCC reinforced with stirrups by 25–85 % when compared to the control specimen. The results demonstrated the superiority of the CFRP as a strengthening material over any other materials, also, the novel scheme proposed in this study (variable width stirrups) gave the highest punching capacity compared to the identical case slabs. To validate the experimental results, a finite element analysis using ABAQUS/CAE6.14 was performed, and the results were very close to the experimental one. Moreover, theoretical equations have been verified on the experimental specimens. Finally, experimental, theoretical, and analytical results were compared. The novel scheme and CFRP stirrups were recommended to use for enhancing the punching shear resistance.http://www.sciencedirect.com/science/article/pii/S2214509523001146Punching shearCFRPGFRPStrengtheningTransverse reinforcementsABAQUS |
| spellingShingle | Mohamed H. Makhlouf Gamal Ismail Ahmed H. Abdel Kreem Marwa I. Badawi Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes Case Studies in Construction Materials Punching shear CFRP GFRP Strengthening Transverse reinforcements ABAQUS |
| title | Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes |
| title_full | Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes |
| title_fullStr | Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes |
| title_full_unstemmed | Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes |
| title_short | Investigation of transverse reinforcement for R.C flat slabs against punching shear and comparison with innovative strengthening technique using FRP ropes |
| title_sort | investigation of transverse reinforcement for r c flat slabs against punching shear and comparison with innovative strengthening technique using frp ropes |
| topic | Punching shear CFRP GFRP Strengthening Transverse reinforcements ABAQUS |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523001146 |
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