Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns
FRP-confined gangue aggregate concrete partially filled steel tubes (CGCPFTs) can not only effectively enhance the performance of coal gangue concrete, but also fully exploit the elastic-plastic mechanical behavior of the steel tubes. However, research on theoretical models that can describe their m...
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MDPI AG
2024-11-01
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| author | Jian Wang Junwu Xia Chuanzhi Sun Jinsheng Cheng Shengbo Zhou Jibing Deng |
| author_facet | Jian Wang Junwu Xia Chuanzhi Sun Jinsheng Cheng Shengbo Zhou Jibing Deng |
| author_sort | Jian Wang |
| collection | DOAJ |
| description | FRP-confined gangue aggregate concrete partially filled steel tubes (CGCPFTs) can not only effectively enhance the performance of coal gangue concrete, but also fully exploit the elastic-plastic mechanical behavior of the steel tubes. However, research on theoretical models that can describe their mechanical properties is yet to be conducted. To fill this gap, theoretical models for structural design and analysis were proposed for CGCPFTs. For the analytical model, based on the available experimental data, a prediction method for the stress–strain behavior of the gangue aggregate concrete in CGCPFTs, which is confined only by FRP and partly confined by both FRP and the steel tubes, was first proposed. Additionally, the condition for the synergetic deformation of the two confined states of gangue aggregate concrete within the CGCPFT was proposed. Based on the condition, an iterative incremental process was developed which subsequently allows for the theoretical calculation of the load–displacement curve for the CGCPFT under monotonic axial compression. For the design model, by introducing the constraint contribution coefficient of the steel tube, the existing closed-loop calculation formula for the stress–strain relationship of FRP-confined concrete was revised. Furthermore, by expressing the axial and lateral stresses of the steel tube as a unified circumferential effect on the concrete, the calculation methods for the ultimate strength and strain in the closed-loop formula were redefined, thus achieving the prediction of the stress–strain behavior of CGCPFTs. The comparison with the test data obtained by the author and their team revealed that both the analysis and design models could provide accurate predictions. |
| format | Article |
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| institution | Kabale University |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-11-01 |
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| spelling | doaj-art-9f6db32a6b6748e2a948a11dfc58799d2024-11-26T17:55:57ZengMDPI AGBuildings2075-53092024-11-011411351610.3390/buildings14113516Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube ColumnsJian Wang0Junwu Xia1Chuanzhi Sun2Jinsheng Cheng3Shengbo Zhou4Jibing Deng5School of Civil Engineering and Architecture, Suqian University, Suqian 223800, ChinaJiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Civil Engineering and Architecture, Suqian University, Suqian 223800, ChinaSuqian City Urban Construction Investment (Group) Co., Ltd., Suqian 223800, ChinaSchool of Civil Engineering and Architecture, Suqian University, Suqian 223800, ChinaChina Construction Fifth Engineering Bureau Co., Ltd., Changsha 410004, ChinaFRP-confined gangue aggregate concrete partially filled steel tubes (CGCPFTs) can not only effectively enhance the performance of coal gangue concrete, but also fully exploit the elastic-plastic mechanical behavior of the steel tubes. However, research on theoretical models that can describe their mechanical properties is yet to be conducted. To fill this gap, theoretical models for structural design and analysis were proposed for CGCPFTs. For the analytical model, based on the available experimental data, a prediction method for the stress–strain behavior of the gangue aggregate concrete in CGCPFTs, which is confined only by FRP and partly confined by both FRP and the steel tubes, was first proposed. Additionally, the condition for the synergetic deformation of the two confined states of gangue aggregate concrete within the CGCPFT was proposed. Based on the condition, an iterative incremental process was developed which subsequently allows for the theoretical calculation of the load–displacement curve for the CGCPFT under monotonic axial compression. For the design model, by introducing the constraint contribution coefficient of the steel tube, the existing closed-loop calculation formula for the stress–strain relationship of FRP-confined concrete was revised. Furthermore, by expressing the axial and lateral stresses of the steel tube as a unified circumferential effect on the concrete, the calculation methods for the ultimate strength and strain in the closed-loop formula were redefined, thus achieving the prediction of the stress–strain behavior of CGCPFTs. The comparison with the test data obtained by the author and their team revealed that both the analysis and design models could provide accurate predictions.https://www.mdpi.com/2075-5309/14/11/3516FRPgangue aggregate concretetheoretical modelsstress–strain curvecomposite column |
| spellingShingle | Jian Wang Junwu Xia Chuanzhi Sun Jinsheng Cheng Shengbo Zhou Jibing Deng Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns Buildings FRP gangue aggregate concrete theoretical models stress–strain curve composite column |
| title | Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns |
| title_full | Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns |
| title_fullStr | Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns |
| title_full_unstemmed | Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns |
| title_short | Research on the Theoretical Models of FRP-Confined Gangue Aggregate Concrete Partially Filled Steel Tube Columns |
| title_sort | research on the theoretical models of frp confined gangue aggregate concrete partially filled steel tube columns |
| topic | FRP gangue aggregate concrete theoretical models stress–strain curve composite column |
| url | https://www.mdpi.com/2075-5309/14/11/3516 |
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