| Author: | Zhang, Jian |
| Title: | Compressive behavior of square steel tubes filled with high strength steel-confined concrete |
| Advisors: | Teng, J. G. (CEE) |
| Degree: | M.Sc. |
| Year: | 2016 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Tubular steel structures Columns, Concrete Concrete-filled tubes |
| Department: | Faculty of Construction and Environment |
| Pages: | xv, 128 pages : color illustrations |
| Language: | English |
| Abstract: | To enhance the ductility of rectangular concrete-filled steel tubular (CFST) columns, a novel form of high-performance rectangular CFST columns has recently been proposed by Prof. J.G. Teng at The Hong Kong Polytechnic University, in which high-strength steel (HSS) spirals are used to provide strong confinement to the infilled concrete. A recent pilot test showed that this new type of columns, referred to as rectangular confined-concrete-filled steel tubular (CCFST) columns, exhibits excellent structural behavior. This dissertation presents an experimental study into the behavior of square CCFST columns subjected to monotonic axial compression. A series of laboratory tests was conducted, and the test results showed that interactions among the three components in a CCFST column (i.e., steel tube, concrete, and HSS spiral) are activated after the initial stage of loading, leading to significant enhancement in both the load-carrying capacity and ductility of the CCFST column. A comparison between the proposed CCFST column and another recently proposed column form (i.e., the FRP-confined concrete-filled steel tubular column proposed by other researchers, where the in-filled concrete is confined by an FRP tube) shows that the proposed CCFST column exhibits significantly better performance. This dissertation provides the first set of reliable experimental data for CCFST columns under monotonic compression, with the only parameter examined being the volumetric ratio of HSS spirals. The effects of other parameters, such as the strength of concrete and the thickness of the steel tube remain unclear and need further research. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991021953153203411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 6.8 MB | Adobe PDF | View/Open |
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