Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns

The flexural buckling behaviour and residual resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns after exposure to fire are studied in this paper, based on experiments and numerical modelling. Twelve column specimens, fabricated from concretes with three r...

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Main Authors: Wang, Ziyi, Zhong, Yukai, Su, Andi, Su, Meini, Zhao, Ou
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2025
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Online Access:https://hdl.handle.net/10356/182497
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1824972025-02-05T01:28:35Z Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns Wang, Ziyi Zhong, Yukai Su, Andi Su, Meini Zhao, Ou School of Civil and Environmental Engineering Engineering Pin-ended column tests Post-fire flexural buckling resistances The flexural buckling behaviour and residual resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns after exposure to fire are studied in this paper, based on experiments and numerical modelling. Twelve column specimens, fabricated from concretes with three recycled coarse aggregate replacement ratios (0%, 35% and 70%), were tested after exposure to the ISO 834 standard fire for 0 min (i.e. at ambient temperature), 15 min, 30 min and 45 min. The experimental investigation included heating of specimens, cylinder tests as well as post-fire initial global geometric imperfection measurements, tensile coupon tests and pin-ended column tests. The test setups, procedures and results were fully reported and the ductility indices, lateral deflection distributions and longitudinal strains were discussed and analysed. A numerical investigation was afterwards carried out, where the test results were used to validate thermal and mechanical finite element models; upon validation, parametric studies were conducted to expand the test data bank over a wider range of cross-section dimensions and member lengths. On the basis of the test and numerical data, the relevant design rules for square natural aggregate concrete-filled carbon steel tube columns at ambient temperature, as set out in the European code, Australian/New Zealand standard and American specification, were assessed, using post-fire material properties, for their applicability to square RACFSST columns after exposure to fire. It was found from the assessment results that the three design codes resulted in overall accurate and consistent post-fire flexural buckling resistance predictions but some were unsafe. Ministry of Education (MOE) The research work presented in this paper receives financial supports from the Singapore Ministry of Education Academic Research Fund (AcRF) Tier 1 Grant (award number: RG122/21). The recycled coarse aggregates used in the present research were sponsored by Pan-United Corporation Ltd. 2025-02-05T01:28:35Z 2025-02-05T01:28:35Z 2024 Journal Article Wang, Z., Zhong, Y., Su, A., Su, M. & Zhao, O. (2024). Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns. Thin-Walled Structures, 205, 112490-. https://dx.doi.org/10.1016/j.tws.2024.112490 0263-8231 https://hdl.handle.net/10356/182497 10.1016/j.tws.2024.112490 2-s2.0-85205425335 205 112490 en RG122/21 Thin-Walled Structures © 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Pin-ended column tests
Post-fire flexural buckling resistances
spellingShingle Engineering
Pin-ended column tests
Post-fire flexural buckling resistances
Wang, Ziyi
Zhong, Yukai
Su, Andi
Su, Meini
Zhao, Ou
Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns
description The flexural buckling behaviour and residual resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns after exposure to fire are studied in this paper, based on experiments and numerical modelling. Twelve column specimens, fabricated from concretes with three recycled coarse aggregate replacement ratios (0%, 35% and 70%), were tested after exposure to the ISO 834 standard fire for 0 min (i.e. at ambient temperature), 15 min, 30 min and 45 min. The experimental investigation included heating of specimens, cylinder tests as well as post-fire initial global geometric imperfection measurements, tensile coupon tests and pin-ended column tests. The test setups, procedures and results were fully reported and the ductility indices, lateral deflection distributions and longitudinal strains were discussed and analysed. A numerical investigation was afterwards carried out, where the test results were used to validate thermal and mechanical finite element models; upon validation, parametric studies were conducted to expand the test data bank over a wider range of cross-section dimensions and member lengths. On the basis of the test and numerical data, the relevant design rules for square natural aggregate concrete-filled carbon steel tube columns at ambient temperature, as set out in the European code, Australian/New Zealand standard and American specification, were assessed, using post-fire material properties, for their applicability to square RACFSST columns after exposure to fire. It was found from the assessment results that the three design codes resulted in overall accurate and consistent post-fire flexural buckling resistance predictions but some were unsafe.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Wang, Ziyi
Zhong, Yukai
Su, Andi
Su, Meini
Zhao, Ou
format Article
author Wang, Ziyi
Zhong, Yukai
Su, Andi
Su, Meini
Zhao, Ou
author_sort Wang, Ziyi
title Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns
title_short Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns
title_full Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns
title_fullStr Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns
title_full_unstemmed Post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (RACFSST) columns
title_sort post-fire flexural buckling and resistances of square recycled aggregate concrete-filled stainless steel tube (racfsst) columns
publishDate 2025
url https://hdl.handle.net/10356/182497
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