Behavior of Reinforced Ultra-High Performance Concrete Slabs Under Impact Loading After Exposure to Elevated Temperatures

Chi, K; Li, J; Wu, C

Behavior of Reinforced Ultra-High Performance Concrete Slabs Under Impact Loading After Exposure to Elevated Temperatures

Chi, K

Li, J

Wu, C

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Publisher:: WORLD SCIENTIFIC PUBL CO PTE LTD
Publication Type:: Journal Article
Citation:: International Journal of Computational Methods, 2022
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Chi, K https://orcid.org/0000-0002-1872-6323
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.contributor.author	Wu, C
dc.date.accessioned	2023-01-16T04:59:37Z
dc.date.available	2023-01-16T04:59:37Z
dc.date.issued	2022-01-01
dc.identifier.citation	International Journal of Computational Methods, 2022
dc.identifier.issn	0219-8762
dc.identifier.issn	1793-6969
dc.identifier.uri	http://hdl.handle.net/10453/165019
dc.description.abstract	Steel fiber-reinforced ultra-high performance concrete (UHPC) material is prone to explosive spalling under elevated temperatures. With the addition of polypropylene (PP) fiber, thermal spalling of UHPC can be mitigated and its fire resistance can be improved. This research investigates the impact resistance of steel and PP fiber-reinforced UHPC slabs after exposure to elevated temperatures, and the structural behavior and damage were compared against normal strength concrete (NSC) slabs. Karagozian & Case concrete (KCC) model was adopted to simulate both NSC and UHPC materials. With consideration of thermal hazards, the material damage, equation of state and strain rate sensitivity were adapted. The validity of this numerical model was evaluated against available experimental results. The numerical model was used to investigate the impact resistance of the reinforced UHPC slabs after exposure to fire hazards. The effect of fire exposure time, impact velocity and impact mass on the resistance of the reinforced NSC and UHPC slabs were analyzed. The simulation results revealed that punching shear failure areas in the NSC slabs were 2.5 times, 3.4 times, 3.0 times and 1.2 times larger than the UHPC slabs after exposure to international standardization ISO-834 standard fire for 1h, 2h, 3h and 4h, respectively. After exposure to the standard fire ISO-834 for 2 h, the punching shear failure on the bottom side of NSC increased 90.9% with the increase in falling height from 1m to 7m, while for the UHPC slabs, the increment was around 67.9%. After exposure to the standard fire ISO-834 for 2h, the punching shear damage of the NSC slabs increased by 72.9% with the punch weight increased from 100kg to 700kg, whereas the damage in the UHPC slabs increased by 53.8%.
dc.language	English
dc.publisher	WORLD SCIENTIFIC PUBL CO PTE LTD
dc.relation.ispartof	International Journal of Computational Methods
dc.relation.isbasedon	10.1142/S0219876222410018
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.rights	Electronic version of an article published as International Journal of Computational Methods, 2022, 10.1142/S0219876222410018] ©2022 World Scientific Publishing Company https://www.worldscientific.com/worldscinet/ijcm
dc.subject	01 Mathematical Sciences, 08 Information and Computing Sciences, 09 Engineering
dc.subject.classification	Applied Mathematics
dc.title	Behavior of Reinforced Ultra-High Performance Concrete Slabs Under Impact Loading After Exposure to Elevated Temperatures
dc.type	Journal Article
utslib.for	01 Mathematical Sciences
utslib.for	08 Information and Computing Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2023-12-05T00:00:00+1000Z
dc.date.updated	2023-01-16T04:59:36Z
pubs.publication-status	Published

Abstract:

Steel fiber-reinforced ultra-high performance concrete (UHPC) material is prone to explosive spalling under elevated temperatures. With the addition of polypropylene (PP) fiber, thermal spalling of UHPC can be mitigated and its fire resistance can be improved. This research investigates the impact resistance of steel and PP fiber-reinforced UHPC slabs after exposure to elevated temperatures, and the structural behavior and damage were compared against normal strength concrete (NSC) slabs. Karagozian & Case concrete (KCC) model was adopted to simulate both NSC and UHPC materials. With consideration of thermal hazards, the material damage, equation of state and strain rate sensitivity were adapted. The validity of this numerical model was evaluated against available experimental results. The numerical model was used to investigate the impact resistance of the reinforced UHPC slabs after exposure to fire hazards. The effect of fire exposure time, impact velocity and impact mass on the resistance of the reinforced NSC and UHPC slabs were analyzed. The simulation results revealed that punching shear failure areas in the NSC slabs were 2.5 times, 3.4 times, 3.0 times and 1.2 times larger than the UHPC slabs after exposure to international standardization ISO-834 standard fire for 1h, 2h, 3h and 4h, respectively. After exposure to the standard fire ISO-834 for 2 h, the punching shear failure on the bottom side of NSC increased 90.9% with the increase in falling height from 1m to 7m, while for the UHPC slabs, the increment was around 67.9%. After exposure to the standard fire ISO-834 for 2h, the punching shear damage of the NSC slabs increased by 72.9% with the punch weight increased from 100kg to 700kg, whereas the damage in the UHPC slabs increased by 53.8%.

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http://hdl.handle.net/10453/165019