Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM
In recent years, many seismic retrofitting methods have been performed to improve the structural performance and prevent the brittle failure of structural members. In the case of steel structures, slender seismic braces have been widely used for buildings, towers, and bridges. The brace connections...
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MDPI AG
2021-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/9/2184 |
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| author | Takahiro Matsui Kohei Suzuki Sota Sato Yuki Kubokawa Daiki Nakamoto Shijir Davaakhishig Yukihiro Matsumoto |
| author_facet | Takahiro Matsui Kohei Suzuki Sota Sato Yuki Kubokawa Daiki Nakamoto Shijir Davaakhishig Yukihiro Matsumoto |
| author_sort | Takahiro Matsui |
| collection | DOAJ |
| description | In recent years, many seismic retrofitting methods have been performed to improve the structural performance and prevent the brittle failure of structural members. In the case of steel structures, slender seismic braces have been widely used for buildings, towers, and bridges. The brace connections should resist the full plastic axial tension load to ensure adequate plastic deformation performance for vibration energy absorption. However, certain connections do not satisfy these requirements. Recently, carbon fiber reinforced plastic (CFRP) has been used extensively to strengthen existing structures because of its high-strength, high elastic modulus, and light-weight characteristics. In this paper, we investigate the applicability of CFRP strengthening for brace connections and gusset plates with stepped surfaces using the vacuum-assisted resin transfer molding technique as a pilot demonstration. Stepped surfaces can be eliminated by using alternative CFRP layers to straighten the structural CFRP layers in order to effectively transfer the axial stress. Eventually, it is shown that CFRP strengthening can improve the connection strength and plastic deformation with 3% elongation, even if the CFRP is molded on the stepped surface. |
| first_indexed | 2024-03-10T12:01:06Z |
| format | Article |
| id | doaj.art-a05d1fbd00e04d6da76ecedfe3ad996c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T12:01:06Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-a05d1fbd00e04d6da76ecedfe3ad996c2023-11-21T16:58:29ZengMDPI AGMaterials1996-19442021-04-01149218410.3390/ma14092184Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTMTakahiro Matsui0Kohei Suzuki1Sota Sato2Yuki Kubokawa3Daiki Nakamoto4Shijir Davaakhishig5Yukihiro Matsumoto6ACM Technology Department, Toray Industries, Inc., 2-1-1 Nihonbashimuromachi, Chuo-ku, Tokyo 103-8666, JapanTechnical Development Headquarters, Constec Engi, Co., Ltd., 6-1-1 Heiwajima, Ota-ku, Tokyo 143-0006, JapanTechnical Development Headquarters, Constec Engi, Co., Ltd., 6-1-1 Heiwajima, Ota-ku, Tokyo 143-0006, JapanDepartment of Architecture and Civil Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, JapanDepartment of Architecture and Civil Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, JapanDepartment of Architecture and Civil Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, JapanDepartment of Architecture and Civil Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, JapanIn recent years, many seismic retrofitting methods have been performed to improve the structural performance and prevent the brittle failure of structural members. In the case of steel structures, slender seismic braces have been widely used for buildings, towers, and bridges. The brace connections should resist the full plastic axial tension load to ensure adequate plastic deformation performance for vibration energy absorption. However, certain connections do not satisfy these requirements. Recently, carbon fiber reinforced plastic (CFRP) has been used extensively to strengthen existing structures because of its high-strength, high elastic modulus, and light-weight characteristics. In this paper, we investigate the applicability of CFRP strengthening for brace connections and gusset plates with stepped surfaces using the vacuum-assisted resin transfer molding technique as a pilot demonstration. Stepped surfaces can be eliminated by using alternative CFRP layers to straighten the structural CFRP layers in order to effectively transfer the axial stress. Eventually, it is shown that CFRP strengthening can improve the connection strength and plastic deformation with 3% elongation, even if the CFRP is molded on the stepped surface.https://www.mdpi.com/1996-1944/14/9/2184carbon fiberpreformVaRTMCFRPstrengtheningsteel structure |
| spellingShingle | Takahiro Matsui Kohei Suzuki Sota Sato Yuki Kubokawa Daiki Nakamoto Shijir Davaakhishig Yukihiro Matsumoto Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM Materials carbon fiber preform VaRTM CFRP strengthening steel structure |
| title | Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM |
| title_full | Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM |
| title_fullStr | Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM |
| title_full_unstemmed | Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM |
| title_short | Pilot Demonstration of a Strengthening Method for Steel-Bolted Connections Using Pre-Formable Carbon Fiber Cloth with VaRTM |
| title_sort | pilot demonstration of a strengthening method for steel bolted connections using pre formable carbon fiber cloth with vartm |
| topic | carbon fiber preform VaRTM CFRP strengthening steel structure |
| url | https://www.mdpi.com/1996-1944/14/9/2184 |
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