Influence of Nano SiO 2 on Structural Behavior of Concrete in-Filled Steel Tube Columns
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ORIGINAL PAPER
Influence of Nano SiO2 on Structural Behavior of Concrete in-Filled Steel Tube Columns P. Vasanthi 1 & S. Senthil Selvan 2 Received: 23 July 2020 / Accepted: 29 September 2020 # Springer Nature B.V. 2020
Abstract The present construction industry requirement is more economical and speedy building the use of Light Gauge steel column infill with concrete that satisfies the excellent strength and improves ductility. Among the various infill materials, Nano SiO2 concrete is gaining attention in the composite column. The present work aims to investigate the comparative structural behavior of different Light gauge steel columns subjected to concentric loading. Light gauge steel rectangular hollow columns, plain and Nano SiO2 Concrete In-filled light gauge steel rectangular columns were considered for this research. The light gauge steel column dimension used for the experimental investigation is 80 mm × 40 mm size with 1.5 m length and 1.2 mm thickness. The ratio of width to thickness considered for the study is 66.67. Three different rectangular columns structural behavior such as load vs. axial shortening, deflection, strain characterization, and failure modes were studied from the experimental results under linear and non-linear stages. Further, the strength capacity obtained from the experiments is compared with theoretical strength derived from codes such as EC4, ACI, and BS5400. Results showed that a nano SiO2 in-filled concrete column enhances both strength and ductility, under axial load. The buckling resistance of nano SiO2 concrete in-filled steel columns was 4% higher than the plain concrete in-filled steel columns. The strength of plain concrete in-filled steel columns was 2.2 times more than the hollow steel column. Keywords Nano SiO2 concrete . Deformation . Light gauge steel columns . Ductility . FE analysis
1 Introduction In recent years, the use of light gauge steel tubular section has become increasingly popular in civil infrastructure applications. Patel (2019) claims that the Concrete Filled Steel Tubular (CFST) members are commonly used in the construction industries [1]. The CFST columns can be used in high rise buildings, piles, bridge structures, storage tanks, etc. Wan et al. (2017) analyzed the fire resistance of plain, hollow, and circular concrete-filled double steel tubular (CFDST) columns under axial loading conditions. Results showed that the hollow and circular CFDST columns have better fire
* P. Vasanthi [email protected] 1
Department of Civil Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamilnadu, India
2
Department of Civil Engineering, SRM Institute of Science and Technology, Chennai, Tamilnadu, India
resistance and stronger limiting temperature than the plain concrete-filled columns [2]. Cai et al. (2019) studied that the post-fire condition is similar, and the maximum temperature up to 950 °C is used in single shear, and double shear coldformed stainless-steel bolted connections [3]. Li et al. (2019) studied the theoretical model for
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