Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes

This paper presents an experimental investigation of flexural behavior of circular ultra-high-performance concrete with coarse aggregate (CA-UHPC)-filled steel tubes (CA-UHPCFSTs). A total of seven flexural members were tested under a four-point bending load. The failure modes, overall deflection cu...

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Autores principales:	Fanghong Wu, Yanqin Zeng, Ben Li, Xuetao Lyu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	UHPC with coarse aggregate (CA-UHPC) concrete-filled steel tube circular section flexural stiffness flexural capacity Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/123c53b3d7904ac8a4bdf56b5ac81e2e
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spelling	oai:doaj.org-article:123c53b3d7904ac8a4bdf56b5ac81e2e2021-11-11T17:55:23ZExperimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes10.3390/ma142163541996-1944https://doaj.org/article/123c53b3d7904ac8a4bdf56b5ac81e2e2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6354https://doaj.org/toc/1996-1944This paper presents an experimental investigation of flexural behavior of circular ultra-high-performance concrete with coarse aggregate (CA-UHPC)-filled steel tubes (CA-UHPCFSTs). A total of seven flexural members were tested under a four-point bending load. The failure modes, overall deflection curves, moment-versus-curvature relationships, moment-versus-strain curves, strain distribution curves, ductility, flexural stiffness and ultimate flexural capacity were evaluated. The results indicate that the CA-UHPCFSTs under bending behaved in a good ductile manner. The CA-UHPC strength has a limited effect on the ultimate flexural capacity, while the addition of steel fiber can improve the ultimate flexural capacity. Increasing the steel tube thickness leads to higher flexural stiffness and ultimate flexural capacity. There is a significant confinement effect between the steel tube and the CA-UHPC core in the compressive zone and centroidal plane after the specimen enters the elastic-plastic stage, while the confinement effect in the tensile zone is minimal. Moreover, the measured flexural stiffness and ultimate flexural capacity were compared with the predictions using various design specifications. Two empirical formulas for calculating the initial and serviceability-level flexural stiffness of CA-UHPCFSTs are developed. Further research is required to propose the accurate design formula for the ultimate flexural capacity of CA-UHPCFSTs.Fanghong WuYanqin ZengBen LiXuetao LyuMDPI AGarticleUHPC with coarse aggregate (CA-UHPC)concrete-filled steel tubecircular sectionflexural stiffnessflexural capacityTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6354, p 6354 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	UHPC with coarse aggregate (CA-UHPC) concrete-filled steel tube circular section flexural stiffness flexural capacity Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	UHPC with coarse aggregate (CA-UHPC) concrete-filled steel tube circular section flexural stiffness flexural capacity Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Fanghong Wu Yanqin Zeng Ben Li Xuetao Lyu Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
description	This paper presents an experimental investigation of flexural behavior of circular ultra-high-performance concrete with coarse aggregate (CA-UHPC)-filled steel tubes (CA-UHPCFSTs). A total of seven flexural members were tested under a four-point bending load. The failure modes, overall deflection curves, moment-versus-curvature relationships, moment-versus-strain curves, strain distribution curves, ductility, flexural stiffness and ultimate flexural capacity were evaluated. The results indicate that the CA-UHPCFSTs under bending behaved in a good ductile manner. The CA-UHPC strength has a limited effect on the ultimate flexural capacity, while the addition of steel fiber can improve the ultimate flexural capacity. Increasing the steel tube thickness leads to higher flexural stiffness and ultimate flexural capacity. There is a significant confinement effect between the steel tube and the CA-UHPC core in the compressive zone and centroidal plane after the specimen enters the elastic-plastic stage, while the confinement effect in the tensile zone is minimal. Moreover, the measured flexural stiffness and ultimate flexural capacity were compared with the predictions using various design specifications. Two empirical formulas for calculating the initial and serviceability-level flexural stiffness of CA-UHPCFSTs are developed. Further research is required to propose the accurate design formula for the ultimate flexural capacity of CA-UHPCFSTs.
format	article
author	Fanghong Wu Yanqin Zeng Ben Li Xuetao Lyu
author_facet	Fanghong Wu Yanqin Zeng Ben Li Xuetao Lyu
author_sort	Fanghong Wu
title	Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
title_short	Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
title_full	Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
title_fullStr	Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
title_full_unstemmed	Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes
title_sort	experimental investigation of flexural behavior of ultra-high-performance concrete with coarse aggregate-filled steel tubes
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/123c53b3d7904ac8a4bdf56b5ac81e2e
work_keys_str_mv	AT fanghongwu experimentalinvestigationofflexuralbehaviorofultrahighperformanceconcretewithcoarseaggregatefilledsteeltubes AT yanqinzeng experimentalinvestigationofflexuralbehaviorofultrahighperformanceconcretewithcoarseaggregatefilledsteeltubes AT benli experimentalinvestigationofflexuralbehaviorofultrahighperformanceconcretewithcoarseaggregatefilledsteeltubes AT xuetaolyu experimentalinvestigationofflexuralbehaviorofultrahighperformanceconcretewithcoarseaggregatefilledsteeltubes
_version_	1718431925625946112

Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes

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