Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections
The objective of this study is to examine the effect of the poor anchorage length of glass fiber reinforced polymer (GFRP) bars used for longitudinal reinforcement on the flexural and shear performances of beam elements in exterior beam⁻column connections made using high-strength materials...
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MDPI AG
2018-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/8/12/2353 |
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| author | Keun-Hyeok Yang Ju-Hyun Mun |
| author_facet | Keun-Hyeok Yang Ju-Hyun Mun |
| author_sort | Keun-Hyeok Yang |
| collection | DOAJ |
| description | The objective of this study is to examine the effect of the poor anchorage length of glass fiber reinforced polymer (GFRP) bars used for longitudinal reinforcement on the flexural and shear performances of beam elements in exterior beam⁻column connections made using high-strength materials. Six exterior beam⁻column connection specimens were tested under reversal cyclic loads applied at the free-end of the beam. The selected strength categories of materials in the beam element were as follows: 35 MPa and 70 MPa for the design compressive strength of concrete, 400 MPa and 600 MPa for the yield strength of conventional longitudinal steel bars, and 800 MPa for the tensile strength of the GFRP bar. All the longitudinal steel bars of the beams satisfied the minimum requirements of the provisions of ACI 318⁻14, whereas all the longitudinal GFRP bars of the beam were linearly anchored into the column section, resulting in poor anchorage length, especially for the beam with the concrete compressive strength of 35 MPa. The flexure-governed beams with GFRP bars exhibited a greater increasing rate in displacement at the pre-peak state and did not display the plastic flow characteristic after the peak load when compared with companion beams with steel bars. The beams with GFRP bars possessed lower diagonal cracking strengths and shear capacities than the companion beams with steel bars although the shear capacities of the beams with GFRP bars could be conservatively predicted using the design equation of ACI 440.1R⁻15 provision. The low elastic modulus and elongation capacity of GFRP bars resulted in large displacements and brittle post-peak beam performances. Furthermore, the lack of anchorage length of GFRP bars in exterior beam⁻column connection significantly reduced the flexural strength and ductility of the beam element. |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-21T02:32:30Z |
| publishDate | 2018-11-01 |
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| series | Applied Sciences |
| spelling | doaj.art-e357b63728c8449ea1fbc66ea07419a62022-12-21T19:18:53ZengMDPI AGApplied Sciences2076-34172018-11-01812235310.3390/app8122353app8122353Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column ConnectionsKeun-Hyeok Yang0Ju-Hyun Mun1Department of Architectural Engineering, Kyonggi University, Suwon 16227, KoreaDepartment of Architectural Engineering, Kyonggi University, Suwon 16227, KoreaThe objective of this study is to examine the effect of the poor anchorage length of glass fiber reinforced polymer (GFRP) bars used for longitudinal reinforcement on the flexural and shear performances of beam elements in exterior beam⁻column connections made using high-strength materials. Six exterior beam⁻column connection specimens were tested under reversal cyclic loads applied at the free-end of the beam. The selected strength categories of materials in the beam element were as follows: 35 MPa and 70 MPa for the design compressive strength of concrete, 400 MPa and 600 MPa for the yield strength of conventional longitudinal steel bars, and 800 MPa for the tensile strength of the GFRP bar. All the longitudinal steel bars of the beams satisfied the minimum requirements of the provisions of ACI 318⁻14, whereas all the longitudinal GFRP bars of the beam were linearly anchored into the column section, resulting in poor anchorage length, especially for the beam with the concrete compressive strength of 35 MPa. The flexure-governed beams with GFRP bars exhibited a greater increasing rate in displacement at the pre-peak state and did not display the plastic flow characteristic after the peak load when compared with companion beams with steel bars. The beams with GFRP bars possessed lower diagonal cracking strengths and shear capacities than the companion beams with steel bars although the shear capacities of the beams with GFRP bars could be conservatively predicted using the design equation of ACI 440.1R⁻15 provision. The low elastic modulus and elongation capacity of GFRP bars resulted in large displacements and brittle post-peak beam performances. Furthermore, the lack of anchorage length of GFRP bars in exterior beam⁻column connection significantly reduced the flexural strength and ductility of the beam element.https://www.mdpi.com/2076-3417/8/12/2353GFRP baranchorage lengthductilityflexural strengthshear strength |
| spellingShingle | Keun-Hyeok Yang Ju-Hyun Mun Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections Applied Sciences GFRP bar anchorage length ductility flexural strength shear strength |
| title | Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections |
| title_full | Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections |
| title_fullStr | Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections |
| title_full_unstemmed | Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections |
| title_short | Cyclic Flexural and Shear Performances of Beam Elements with Longitudinal Glass Fiber Reinforced Polymer (GFRP) Bars in Exterior Beam-Column Connections |
| title_sort | cyclic flexural and shear performances of beam elements with longitudinal glass fiber reinforced polymer gfrp bars in exterior beam column connections |
| topic | GFRP bar anchorage length ductility flexural strength shear strength |
| url | https://www.mdpi.com/2076-3417/8/12/2353 |
| work_keys_str_mv | AT keunhyeokyang cyclicflexuralandshearperformancesofbeamelementswithlongitudinalglassfiberreinforcedpolymergfrpbarsinexteriorbeamcolumnconnections AT juhyunmun cyclicflexuralandshearperformancesofbeamelementswithlongitudinalglassfiberreinforcedpolymergfrpbarsinexteriorbeamcolumnconnections |