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学者姓名：宋天诣
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Abstract ：
This paper investigates the post-fire performance of elliptical concrete-filled steel tubular (CFST) columns by a series of post-fire axially-loaded stub column tests and numerical analysis. The test parameters included target temperature, high temperature duration time, section type and section size. A post-fire stress-strain relationship model of core concrete applicable to the elliptical CFST column was proposed according to the test data, and finite element analysis (FEA) model of the elliptical CFST column was established. Based on the FEA model, the temperature and deformation developments, failure mode, stress and load distributions of elliptical CFST col-umns were analyzed and discussed, and parametric analysis was further conducted to identify the key influencing factors on the post-fire ultimate bearing capacity and residual bearing capacity index of elliptical CFST columns. Finally, a simplified formula was proposed to calculate the post-fire residual bearing capacity index of elliptical CFST columns.
Keyword ：
Elliptical concrete-filled steel tube Elliptical concrete-filled steel tube Ultimate bearing capacity Ultimate bearing capacity Stress-strain relationship Stress-strain relationship Finite element analysis Finite element analysis Post-fire Post-fire
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| GB/T 7714 | Song, Tian-Yi , Li, Chen-Liu , Chen, Zheng et al. Post-fire performance of axially-loaded elliptical concrete-filled steel tubular stub columns [J]. | STRUCTURES , 2023 , 50 : 2004-2023 . |
| MLA | Song, Tian-Yi et al. "Post-fire performance of axially-loaded elliptical concrete-filled steel tubular stub columns" . | STRUCTURES 50 (2023) : 2004-2023 . |
| APA | Song, Tian-Yi , Li, Chen-Liu , Chen, Zheng , Liu, Xia-Lu , Zhou, Hongyuan . Post-fire performance of axially-loaded elliptical concrete-filled steel tubular stub columns . | STRUCTURES , 2023 , 50 , 2004-2023 . |
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Abstract ：
The collapses of building structures in fire have occurred several times during the last two decades. To save lives from the collapsed building, a reasonable method is to predict the collapse of the structure in advance, for being able to evacuate the persons on site, such as fire-fighters, before the deadly collapse will occur. Therefore, in fire condition, the early-warning of structural collapse or member failure based on accurate on-site data collection and refined failure state determination is becoming a key issue in the fire research field. A parameter measured easily - the temperature - is taken as the indicator of the fire-induced failure, and an investigation on the refined critical temperatures of the concrete filled steel tubular (CFST) columns will be described in this paper. A series of fire resistance tests on CFST columns were conducted and are reported in this paper, and the influence of different test parameters, including column load ratio (0.3, 0.4 and 0.6), section type (circular and square sections) and fire scenario (fire exposure on two surfaces and all around the column), on the critical temperatures of CFST columns are discussed. Based on the test data and validated finite element analysis (FEA) models, refined critical temperatures (RCTs) for CFST columns were defined and are discussed. Compared with the traditional critical temperature, the RCTs clearly defined the positions and values of critical temperature points, which makes it applicable to be used as the early-warning of fire-induced failure of CFST columns.
Keyword ：
Concrete-filled steel tube Concrete-filled steel tube Critical temperature Critical temperature Fire scenario Fire scenario Fire resistance Fire resistance Early-warning of fire-induced failure Early-warning of fire-induced failure
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| GB/T 7714 | Song, Tian-Yi , Yu, Wen-Chuan , Xiang, Kai et al. Critical temperatures of concrete-filled steel tubular columns for early-warning of fire-induced failure [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2022 , 191 . |
| MLA | Song, Tian-Yi et al. "Critical temperatures of concrete-filled steel tubular columns for early-warning of fire-induced failure" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 191 (2022) . |
| APA | Song, Tian-Yi , Yu, Wen-Chuan , Xiang, Kai , Zhou, Hong-Yuan . Critical temperatures of concrete-filled steel tubular columns for early-warning of fire-induced failure . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2022 , 191 . |
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Abstract ：
The early-warning of fire-induced failure of structural members is becoming more and more attractive to the fire department since it can provide warning signal to the firefighters at the scene of a building fire. Temperature is a type of easily-measured parameter in fire condition, and can reflect the ultimate state of structural members to some extent, therefore it has the application potential to indicate the failure of structural members in fire. The traditional critical temperature method (CTM) in Eurocode 3 or Chinese standard GB 51249-2017 has been widely used in the fire safety design of steel members, but it cannot be extended to the early-warning of fire -induced failure directly. Based on the traditional CTM, this paper presents an advanced critical temperature method for simply-supported H-shaped steel beams under different fire scenarios. Finite element analysis (FEA) models were established and validated to investigate the critical temperatures of H-shaped steel beams. Based on the numerical analysis, guidelines for confirming the positions of characteristic temperature points (CTPs) and values of refined critical temperatures (RCTs) on H-shaped steel beams were proposed, and parametric analysis results indicated that the longitudinal fire scenario, perimeter of beam section and beam load ratio were the key influencing parameters. Finally, a design table was proposed to determine the positions of CTPs and values of RCTs of simply-supported H-shaped steel beams with 2-hour fire rating time, which can be used in the early -warning of fire-induced failure directly.
Keyword ：
Critical temperature Critical temperature Fire scenario Fire scenario Steel beam Steel beam Early-warning of fire-induced failure Early-warning of fire-induced failure Advanced critical temperature method Advanced critical temperature method
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| GB/T 7714 | Song, Tian-Yi , Qu, Xing-Yu , Zhou, Hongyuan et al. Advanced critical temperature method for steel beams exposed to different fire scenarios [J]. | STRUCTURES , 2022 , 44 : 200-215 . |
| MLA | Song, Tian-Yi et al. "Advanced critical temperature method for steel beams exposed to different fire scenarios" . | STRUCTURES 44 (2022) : 200-215 . |
| APA | Song, Tian-Yi , Qu, Xing-Yu , Zhou, Hongyuan , Xiang, Kai . Advanced critical temperature method for steel beams exposed to different fire scenarios . | STRUCTURES , 2022 , 44 , 200-215 . |
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Abstract ：
The post-fire bond behaviour between the steel tube and core concrete in elliptical concrete filled steel tubes (ECFST) is studied in this paper. A total of 15 post-fire push-out test specimens, including 9 elliptical, 3 circular and 3 square CFSTs, were designed and tested. The testing parameters included: (a) target temperatures (Ttar = 20 degrees C, 600 degrees C and 800 degrees C); (b) high temperature duration time (td = 30 min, 60 min, 180 min and 300 min); (c) length of long axis of elliptical section (2a = 200 mm and 300 mm); (d) section type (elliptical, circular and square). The test results indicated that the target temperature and high temperature duration time affected the post-fire bond strength of ECFSTs significantly, and the post-fire bond strength of ECFSTs could be increased with the increasing values of the two parameters. Based on the test data, a two-linear stage bond stress versus slip constitutive model considering the influence of both the temperature and fire-exposed surface area was proposed and verified to capture the post-fire bond behaviour in ECFSTs, which could be used in the refined bond behaviour numerical analysis of ECFSTs.
Keyword ：
Elliptical section Elliptical section Concrete-filled steel tube Concrete-filled steel tube Bond stress-slip constitutive model Bond stress-slip constitutive model Bond behaviour Bond behaviour Post-fire Post-fire
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| GB/T 7714 | Song, Tian-Yi , Wang, Cheng-Hao , Liu, Xia-Lu et al. Post-fire bond behaviour in elliptical concrete filled steel tubes: Experiment and simulation [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2022 , 201 . |
| MLA | Song, Tian-Yi et al. "Post-fire bond behaviour in elliptical concrete filled steel tubes: Experiment and simulation" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 201 (2022) . |
| APA | Song, Tian-Yi , Wang, Cheng-Hao , Liu, Xia-Lu , Xiang, Kai , Zhou, Hongyuan . Post-fire bond behaviour in elliptical concrete filled steel tubes: Experiment and simulation . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2022 , 201 . |
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Abstract ：
In recent years, concrete-filled steel tube (CFST) structures have been widely used in modern high-rise buildings. Compared with traditional circular and square CFST columns, elliptical concrete-filled steel tube (ECFST) columns show better structural performance such as higher torsion stiffness and flexural stiffness. The structural performance of ECFST columns at ambient temperature and in fire condition have been investigated by previous researchers. However, very limited research on the post-fire performance of ECFST columns has been conducted. In this paper, finite element analysis (FEA) models of ECFST stub columns were established to investigate their post-fire performance. In order to study the influence of section type on the post-fire performance of CFST stub columns, FEA models of circular and square CFST stub columns were also built to compare with the ECFST model. The temperature development in fire exposure stage, axial load versus average axial strain curves, load distribution and steel tube-core concrete interaction during the post-fire loading process were obtained and discussed.
Keyword ：
Post-fire Post-fire Stub columns Stub columns Concrete-filled steel tubes Concrete-filled steel tubes Residual bearing capacity Residual bearing capacity Elliptical hollow sections Elliptical hollow sections
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| GB/T 7714 | Song, T. Y. , Zhang, J. C. , Xiang, K. . POST-FIRE PERFORMANCE OF ELLIPTICAL CONCRETE-FILLED STEEL TUBE STUB COLUMNS [C] . 2019 : 1459-1469 . |
| MLA | Song, T. Y. et al. "POST-FIRE PERFORMANCE OF ELLIPTICAL CONCRETE-FILLED STEEL TUBE STUB COLUMNS" . (2019) : 1459-1469 . |
| APA | Song, T. Y. , Zhang, J. C. , Xiang, K. . POST-FIRE PERFORMANCE OF ELLIPTICAL CONCRETE-FILLED STEEL TUBE STUB COLUMNS . (2019) : 1459-1469 . |
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