STRUCTURAL RESPONSE OF EXPANSIVE CONCRETE FILLED STAINLESS STEEL TUBES SUBJECTED TO AXIAL COMPRESSION
Isha Rohilla, S. M. Gupta
Abstract: The usage of calcium-sulfoaluminate (CSA) cement is gaining popularity in construction of concrete filled steel tubular columns or composite columns due to its various properties such as early age expansion and low carbon emission. But addition of expansive cements like CSA also induces the brittle behaviour in CFST columns. This study experimentally examines the performance of circular and square composite columns with stainless steel tubes and different percentages of CSA cement to understand their axial compression behaviour. The effect on ductility of these composite columns was also analysed. Variables involved for this study were a) percentage of CSA cement; b) grades of concrete; c) cross sectional shape and d) length to diameter ratio. The results showed that the tested expansive concrete filled stainless-steel tubular (ECFSST) columns had higher axial compression strength and excellent ductility when compared with that of normal concrete of same grade. It was also observed that the confinement effect of stainless steel on expansive concrete is as reliable as that of normal concrete. The ultimate compression strength of all the ECFSST specimens determined experimentally in lab were compared to the predicted maximum strength determined using the current standards AISC360-10 (2010), EC4 (2004), and GB 50936-2014 (2010). These codes are shown to be appropriately cautious in estimating the sectional strength of expansive concrete-filled stainless steel tubular stub columns.
Keywords: Calcium sulfoaluminate cement, Stainless steel composite columns, Ductility, Axial compression behaviour, Expansive cement
DOI: 10.24874/PES08.03B.006
Recieved: 15.04.2026 Revised: 08.07.2026 Accepted: 31.07.2026
UDC:
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