Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes
Based on the project of the Guansheng Qujiang Bridge, the flexural mechanical properties of an ultrahigh strength concrete filled steel tube (UHSCFST) were discussed. A total of six UHSCFST beam specimens were tested, and the cube strength (<i>f<sub>cu</sub></i>) of the core...
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MDPI AG
2022-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/15/5262 |
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| author | Xiaojun Zhou Yulin Zhan Tingmin Mou Zhilun Li |
| author_facet | Xiaojun Zhou Yulin Zhan Tingmin Mou Zhilun Li |
| author_sort | Xiaojun Zhou |
| collection | DOAJ |
| description | Based on the project of the Guansheng Qujiang Bridge, the flexural mechanical properties of an ultrahigh strength concrete filled steel tube (UHSCFST) were discussed. A total of six UHSCFST beam specimens were tested, and the cube strength (<i>f<sub>cu</sub></i>) of the core concrete reached 80.3–115.2 MPa. The effects of concrete strength on flexural bearing capacity, deformation characteristics, and failure modes of UHSCFST specimens were discussed. Test results showed that the bending failure modes of UHSCFST specimens were the same as those of ordinary ones. The failure of UHSCFST specimens was attributed to excessive deflection, and local buckling occurred in the compression zone. Moreover, the bending capacity of the specimens did not decrease, even if they had yielded. Although ultrahigh strength concrete was poured, all of the specimens displayed outstanding bending ductility. The main function of core concrete was to provide radial restraint for the steel tube to avoid premature buckling. When the steel content of the specimen section was constant, the strength increases of core concrete had a slight impact on the bending failure mode, bearing capacity and ductility of UHSCFST specimen. The research results can deepen the understanding of the mechanical behaviors of the UHSCFST composite truss structure. |
| first_indexed | 2024-03-09T10:07:25Z |
| format | Article |
| id | doaj.art-699812ace1e14251abb02b89c9325910 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T10:07:25Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-699812ace1e14251abb02b89c93259102023-12-01T23:01:01ZengMDPI AGMaterials1996-19442022-07-011515526210.3390/ma15155262Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel TubesXiaojun Zhou0Yulin Zhan1Tingmin Mou2Zhilun Li3School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSichuan Provincial Highway Planning, Survey and Design Research Institute Co., Ltd., Chengdu 610041, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaBased on the project of the Guansheng Qujiang Bridge, the flexural mechanical properties of an ultrahigh strength concrete filled steel tube (UHSCFST) were discussed. A total of six UHSCFST beam specimens were tested, and the cube strength (<i>f<sub>cu</sub></i>) of the core concrete reached 80.3–115.2 MPa. The effects of concrete strength on flexural bearing capacity, deformation characteristics, and failure modes of UHSCFST specimens were discussed. Test results showed that the bending failure modes of UHSCFST specimens were the same as those of ordinary ones. The failure of UHSCFST specimens was attributed to excessive deflection, and local buckling occurred in the compression zone. Moreover, the bending capacity of the specimens did not decrease, even if they had yielded. Although ultrahigh strength concrete was poured, all of the specimens displayed outstanding bending ductility. The main function of core concrete was to provide radial restraint for the steel tube to avoid premature buckling. When the steel content of the specimen section was constant, the strength increases of core concrete had a slight impact on the bending failure mode, bearing capacity and ductility of UHSCFST specimen. The research results can deepen the understanding of the mechanical behaviors of the UHSCFST composite truss structure.https://www.mdpi.com/1996-1944/15/15/5262ultrahigh strength concreteconcrete filled steel tubeflexural bearing capacityfailure mode |
| spellingShingle | Xiaojun Zhou Yulin Zhan Tingmin Mou Zhilun Li Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes Materials ultrahigh strength concrete concrete filled steel tube flexural bearing capacity failure mode |
| title | Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes |
| title_full | Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes |
| title_fullStr | Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes |
| title_full_unstemmed | Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes |
| title_short | Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes |
| title_sort | experimental research on flexural mechanical properties of ultrahigh strength concrete filled steel tubes |
| topic | ultrahigh strength concrete concrete filled steel tube flexural bearing capacity failure mode |
| url | https://www.mdpi.com/1996-1944/15/15/5262 |
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