Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP
Using lightweight reinforced concrete beams with glass fiber bars (GFRP) is one approach for achieving the requirement seismic design idea of “strong-columns weak-beams”. Twelve full-scale normal-strength concrete (NC with <i>f<sub>c</sub>`</i> = 32 MPa) and high-strength lig...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/12/2/179 |
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| author | Mahmoud A. El-Mandouh Mostafa. S. Omar Mohamed A. Elnaggar Ahmed S. Abd El-Maula |
| author_facet | Mahmoud A. El-Mandouh Mostafa. S. Omar Mohamed A. Elnaggar Ahmed S. Abd El-Maula |
| author_sort | Mahmoud A. El-Mandouh |
| collection | DOAJ |
| description | Using lightweight reinforced concrete beams with glass fiber bars (GFRP) is one approach for achieving the requirement seismic design idea of “strong-columns weak-beams”. Twelve full-scale normal-strength concrete (NC with <i>f<sub>c</sub>`</i> = 32 MPa) and high-strength lightweight concrete (HSLWC with <i>f<sub>c</sub>`</i> = 42, 49 and 52 MPa) exterior beam-column joints have been tested under cyclic loadings. The beams were reinforced with conventional steel bars (CS) and GFRP using steel fibers (SF). The experimental joint shear force was compared with that estimated by some international codes such as the American Concrete Institute (ACI-19), the Egyptian code (ECP-07), and the New Zealand Code (NZS-06). Nonlinear finite element analysis (ABAQUS) was carried out. In the present study, three main parameters were explored (1) HSLWC, (2) GFRP ratios equal to 0.70%, 1.03% and 1.37%, (3) SF ratios equal to 0.0%, 0.75% and 1.50%. The findings of the experiment revealed that increasing the concrete strength from NC with conventional steel bars to high-strength lightweight concrete HSLWC (<i>f<sub>c</sub>`</i> = 42 MPa) with the same ratio of GFRP bars enhanced the first cracking load by about 25%. Increasing the SF ratio to 1.50% enhanced the failure load by 18–24% when compared with non-fiber specimens. The predicted joint shear strength estimated using the equations of the ACI 318-19 and ECP-07 are conservative for HSLWC exterior beam-column connection reinforced with GFRP bars but the predicted joint shear strength by using the equations of the NZS-07 is on the borderline for some cases. The finite element program ABAQUS can be used successfully to forecast the behavior of HSLWC beam-column connections reinforced with GFRP under seismic loadings. |
| first_indexed | 2024-03-09T22:26:17Z |
| format | Article |
| id | doaj.art-a696f4ecad314c16b288ae7d485336e4 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-09T22:26:17Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-a696f4ecad314c16b288ae7d485336e42023-11-23T19:06:11ZengMDPI AGBuildings2075-53092022-02-0112217910.3390/buildings12020179Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRPMahmoud A. El-Mandouh0Mostafa. S. Omar1Mohamed A. Elnaggar2Ahmed S. Abd El-Maula3Civil Construction Department, Beni-Suef University, Beni-Suef 62511, EgyptHigher Institute for Engineering and Technology, Department of Structural Engineering, Behira 22511, EgyptStructural Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21519, EgyptFaculty of Engineering, Delta University for Science and Technology, Gamasa 35712, EgyptUsing lightweight reinforced concrete beams with glass fiber bars (GFRP) is one approach for achieving the requirement seismic design idea of “strong-columns weak-beams”. Twelve full-scale normal-strength concrete (NC with <i>f<sub>c</sub>`</i> = 32 MPa) and high-strength lightweight concrete (HSLWC with <i>f<sub>c</sub>`</i> = 42, 49 and 52 MPa) exterior beam-column joints have been tested under cyclic loadings. The beams were reinforced with conventional steel bars (CS) and GFRP using steel fibers (SF). The experimental joint shear force was compared with that estimated by some international codes such as the American Concrete Institute (ACI-19), the Egyptian code (ECP-07), and the New Zealand Code (NZS-06). Nonlinear finite element analysis (ABAQUS) was carried out. In the present study, three main parameters were explored (1) HSLWC, (2) GFRP ratios equal to 0.70%, 1.03% and 1.37%, (3) SF ratios equal to 0.0%, 0.75% and 1.50%. The findings of the experiment revealed that increasing the concrete strength from NC with conventional steel bars to high-strength lightweight concrete HSLWC (<i>f<sub>c</sub>`</i> = 42 MPa) with the same ratio of GFRP bars enhanced the first cracking load by about 25%. Increasing the SF ratio to 1.50% enhanced the failure load by 18–24% when compared with non-fiber specimens. The predicted joint shear strength estimated using the equations of the ACI 318-19 and ECP-07 are conservative for HSLWC exterior beam-column connection reinforced with GFRP bars but the predicted joint shear strength by using the equations of the NZS-07 is on the borderline for some cases. The finite element program ABAQUS can be used successfully to forecast the behavior of HSLWC beam-column connections reinforced with GFRP under seismic loadings.https://www.mdpi.com/2075-5309/12/2/179beam-columnlightweight concreteglass fiber reinforcementjoint shear |
| spellingShingle | Mahmoud A. El-Mandouh Mostafa. S. Omar Mohamed A. Elnaggar Ahmed S. Abd El-Maula Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP Buildings beam-column lightweight concrete glass fiber reinforcement joint shear |
| title | Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP |
| title_full | Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP |
| title_fullStr | Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP |
| title_full_unstemmed | Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP |
| title_short | Cyclic Behavior of High-Strength Lightweight Concrete Exterior Beam-Column Connections Reinforced with GFRP |
| title_sort | cyclic behavior of high strength lightweight concrete exterior beam column connections reinforced with gfrp |
| topic | beam-column lightweight concrete glass fiber reinforcement joint shear |
| url | https://www.mdpi.com/2075-5309/12/2/179 |
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