Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression
Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a novel form of hollow columns consisting of an outer FRP tube, an inner steel tube, and an annular layer of concrete between the two tubes. Due to the effective confinement of the two tubes, the concrete in hybrid DSTCs is wel...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Polymer Technology |
| Online Access: | http://dx.doi.org/10.1155/2020/7573848 |
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| author | Bing Zhang Gui-Sen Feng Yan-Lei Wang Cong-Cong Lai Chen-Chen Wang Xia-Min Hu |
| author_facet | Bing Zhang Gui-Sen Feng Yan-Lei Wang Cong-Cong Lai Chen-Chen Wang Xia-Min Hu |
| author_sort | Bing Zhang |
| collection | DOAJ |
| description | Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a novel form of hollow columns consisting of an outer FRP tube, an inner steel tube, and an annular layer of concrete between the two tubes. Due to the effective confinement of the two tubes, the concrete in hybrid DSTCs is well confined, leading to excellent ductility and strength enhancement. Hybrid DSTCs also have excellent corrosion resistence due to the effective protection of the outer FRP tube. However, existing studies mainly focused on hybrid DSTCs with a circular cross-section. When subjecting to different loads in the two horizontal directions, elliptical columns are preferred as they can provide different bending stiffness and moment capacity around two axes of symmetry without significantly reducing the confining effect of the FRP tube. This paper extends the existing work on circular DSTCs to elliptical DSTCs with a particular focus on four issues: the effect of elliptical aspect ratio (i.e., the ratio of the major axis to the minor axis of the outer elliptical cross-section), the effect of the FRP tube thickness, the effect of void area ratio (i.e., the ratio of the area of concrete void to the area of the outer elliptical section), and the effect of the cross-section of the inner steel tube (i.e., both rectangular and elliptical steel tubes were used). Experimental results show that, the averaged peak stress of the confined concrete in elliptical DSTCs increases with the increase in the elliptical aspect ratio, whereas the elliptical aspect ratio has no obvious effect on the ultimate axial strain; the cross-section shape of the inner steel tube has significant effect on the axial stress-strain behavior of the confined concrete in elliptical DSTCs; elliptical DSTCs with an elliptical steel tube exhibit much better ductility and strength enhancement than those specimens with a rectangular steel tube. A simple stress-strain model of confined concrete was proposed for elliptical DSTCs to account for the effects of the elliptical aspect ratio, the inner void, and the shape of the inner steel tube, which can provide reasonably accurate but conservative predictions. |
| format | Article |
| id | doaj-art-7c59032afbcc419ab23c3ed44104ab95 |
| institution | Kabale University |
| issn | 0730-6679 1098-2329 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Polymer Technology |
| spelling | doaj-art-7c59032afbcc419ab23c3ed44104ab952025-02-03T06:45:54ZengWileyAdvances in Polymer Technology0730-66791098-23292020-01-01202010.1155/2020/75738487573848Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial CompressionBing Zhang0Gui-Sen Feng1Yan-Lei Wang2Cong-Cong Lai3Chen-Chen Wang4Xia-Min Hu5College of Civil Engineering, Nanjing Tech University, Nanjing, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing, ChinaSchool of Civil Engineering, Dalian University of Technology, Dalian, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing, ChinaHybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a novel form of hollow columns consisting of an outer FRP tube, an inner steel tube, and an annular layer of concrete between the two tubes. Due to the effective confinement of the two tubes, the concrete in hybrid DSTCs is well confined, leading to excellent ductility and strength enhancement. Hybrid DSTCs also have excellent corrosion resistence due to the effective protection of the outer FRP tube. However, existing studies mainly focused on hybrid DSTCs with a circular cross-section. When subjecting to different loads in the two horizontal directions, elliptical columns are preferred as they can provide different bending stiffness and moment capacity around two axes of symmetry without significantly reducing the confining effect of the FRP tube. This paper extends the existing work on circular DSTCs to elliptical DSTCs with a particular focus on four issues: the effect of elliptical aspect ratio (i.e., the ratio of the major axis to the minor axis of the outer elliptical cross-section), the effect of the FRP tube thickness, the effect of void area ratio (i.e., the ratio of the area of concrete void to the area of the outer elliptical section), and the effect of the cross-section of the inner steel tube (i.e., both rectangular and elliptical steel tubes were used). Experimental results show that, the averaged peak stress of the confined concrete in elliptical DSTCs increases with the increase in the elliptical aspect ratio, whereas the elliptical aspect ratio has no obvious effect on the ultimate axial strain; the cross-section shape of the inner steel tube has significant effect on the axial stress-strain behavior of the confined concrete in elliptical DSTCs; elliptical DSTCs with an elliptical steel tube exhibit much better ductility and strength enhancement than those specimens with a rectangular steel tube. A simple stress-strain model of confined concrete was proposed for elliptical DSTCs to account for the effects of the elliptical aspect ratio, the inner void, and the shape of the inner steel tube, which can provide reasonably accurate but conservative predictions.http://dx.doi.org/10.1155/2020/7573848 |
| spellingShingle | Bing Zhang Gui-Sen Feng Yan-Lei Wang Cong-Cong Lai Chen-Chen Wang Xia-Min Hu Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression Advances in Polymer Technology |
| title | Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression |
| title_full | Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression |
| title_fullStr | Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression |
| title_full_unstemmed | Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression |
| title_short | Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression |
| title_sort | elliptical frp concrete steel double skin tubular columns under monotonic axial compression |
| url | http://dx.doi.org/10.1155/2020/7573848 |
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