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Flexural behavior of concrete-filled double-skin steel tubular beams after subject to high temperature
Abstract Concrete-filled double-skin steel tubular (CFDST) specimens that exhibit lightweight, good ductility, and better bending resistance, can be used for beams. However, fire often causes great damage, and the flexural behavior of CFDST beams after subject to high-temperature has not been studied. To investigate the flexural behavior of CFDST beams after subject to high temperature, seven CFDST specimens after subject to high temperature were carried out four-point bending tests. The main parameters explored in the test include hollow ratio (0.31, 0.52, 0.72) and temperature (300 °C, 500 °C, 800 °C). The corresponding finite-element analysis (FEA) models were established, and the results showed good agreement with the test. The in-depth mechanism and systematic analysis including the influence of different hollow ratio, material property, and temperature on the whole process curve of CFDST after subject to high temperature are carried out using FEA models. It is found that the ultimate bending moment of CFDST after subject to high-temperature increases with hollow ratio and material property, but decreases with the temperature. The outer steel tube contributes the most to the ultimate bending moment, and the inner steel tube improves the ductility at a later stage. Specimens with a large hollow ratio (χ ≥ 0.52) have better bending capacity, and the ultimate bending moment of specimens with a small hollow ratio (χ < 0.52) decrease the least with the change of temperature due to the protection of concrete. Based on the findings from the test and numerical studies, a temperature effect coefficient k r is proposed to represent the residual bearing capacity after subject to high temperature, and combined with three different codes to evaluate the ultimate bending moment. A comparison of test results showed the calculated results following the T/CCES 7–2020 (2020) had a good agreement.
Graphical abstract Display Omitted
Highlights CFDST beams under pure bending subject to high temperature. The in-depth mechanism and systematic analysis of CFDST after subject to high temperature are carried out. The proportion of ultimate bearing moment of each component is studied by ABAQUS. A temperature effect coefficient k r was proposed to predict the ultimate bending moment after subject to high temperature.
Flexural behavior of concrete-filled double-skin steel tubular beams after subject to high temperature
Abstract Concrete-filled double-skin steel tubular (CFDST) specimens that exhibit lightweight, good ductility, and better bending resistance, can be used for beams. However, fire often causes great damage, and the flexural behavior of CFDST beams after subject to high-temperature has not been studied. To investigate the flexural behavior of CFDST beams after subject to high temperature, seven CFDST specimens after subject to high temperature were carried out four-point bending tests. The main parameters explored in the test include hollow ratio (0.31, 0.52, 0.72) and temperature (300 °C, 500 °C, 800 °C). The corresponding finite-element analysis (FEA) models were established, and the results showed good agreement with the test. The in-depth mechanism and systematic analysis including the influence of different hollow ratio, material property, and temperature on the whole process curve of CFDST after subject to high temperature are carried out using FEA models. It is found that the ultimate bending moment of CFDST after subject to high-temperature increases with hollow ratio and material property, but decreases with the temperature. The outer steel tube contributes the most to the ultimate bending moment, and the inner steel tube improves the ductility at a later stage. Specimens with a large hollow ratio (χ ≥ 0.52) have better bending capacity, and the ultimate bending moment of specimens with a small hollow ratio (χ < 0.52) decrease the least with the change of temperature due to the protection of concrete. Based on the findings from the test and numerical studies, a temperature effect coefficient k r is proposed to represent the residual bearing capacity after subject to high temperature, and combined with three different codes to evaluate the ultimate bending moment. A comparison of test results showed the calculated results following the T/CCES 7–2020 (2020) had a good agreement.
Graphical abstract Display Omitted
Highlights CFDST beams under pure bending subject to high temperature. The in-depth mechanism and systematic analysis of CFDST after subject to high temperature are carried out. The proportion of ultimate bearing moment of each component is studied by ABAQUS. A temperature effect coefficient k r was proposed to predict the ultimate bending moment after subject to high temperature.
Flexural behavior of concrete-filled double-skin steel tubular beams after subject to high temperature
Liu, Xiao (author) / Xu, Hanwen (author) / Wang, Xiaochu (author) / Wang, Bing (author) / Ma, Lu (author)
2020-08-31
Article (Journal)
Electronic Resource
English
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