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Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel
Abstract Cold-formed steels are commonly used in construction applications. However, there is a lack of understanding on its post-fire mechanical properties. This paper presents an experimental investigation on post-fire mechanical properties of cold-formed steels. The test specimens were cut from flat portion and corners of cold-formed channel sections, which were exposed to temperatures ranging from ambient temperature to 800 °C, and then cooled with water and air. The specimens are of grade Q235, with section thicknesses of 1 mm and 2 mm. The stress-strain curves and mechanical properties of the specimens were obtained from tensile coupon tests. Test results of post-fire mechanical properties are presented. Moreover, evolution of microstructure and fracture morphology of specimens with different cooling methods were examined. Finally, predictive equations are proposed for evaluating the post-fire mechanical properties of Q235 cold-formed steel channel sections.
Graphical abstract Display Omitted
Highlights An experimental investigation of Q235 cold-formed steels was conducted to obtain their post-fire mechanical properties. The results showed that the post-fire mechanical properties were affected by cooling methods and temperatures. The difference of post-fire behaviour between the flat and the corner parts of cold-formed steel sections is discussed. New predictive equations were proposed to predict the post-fire yield strength, ultimate strength and ductility.
Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel
Abstract Cold-formed steels are commonly used in construction applications. However, there is a lack of understanding on its post-fire mechanical properties. This paper presents an experimental investigation on post-fire mechanical properties of cold-formed steels. The test specimens were cut from flat portion and corners of cold-formed channel sections, which were exposed to temperatures ranging from ambient temperature to 800 °C, and then cooled with water and air. The specimens are of grade Q235, with section thicknesses of 1 mm and 2 mm. The stress-strain curves and mechanical properties of the specimens were obtained from tensile coupon tests. Test results of post-fire mechanical properties are presented. Moreover, evolution of microstructure and fracture morphology of specimens with different cooling methods were examined. Finally, predictive equations are proposed for evaluating the post-fire mechanical properties of Q235 cold-formed steel channel sections.
Graphical abstract Display Omitted
Highlights An experimental investigation of Q235 cold-formed steels was conducted to obtain their post-fire mechanical properties. The results showed that the post-fire mechanical properties were affected by cooling methods and temperatures. The difference of post-fire behaviour between the flat and the corner parts of cold-formed steel sections is discussed. New predictive equations were proposed to predict the post-fire yield strength, ultimate strength and ductility.
Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel
Ren, Chong (author) / Dai, Liusi (author) / Huang, Yuner (author) / He, Wenfu (author)
Thin-Walled Structures ; 150
2020-01-30
Article (Journal)
Electronic Resource
English
Post-fire mechanical properties of base metal and welds of Q235 steel
| Elsevier | 2021
Experimental investigation of post-fire mechanical properties of cold-formed steels
| Online Contents | 2014