Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

Sequential small impact loads may not collapse structures directly but could weaken the strength of structures. This study aimed to investigate the impact of these sequential small impact loads on the strength of the reinforced concrete beams. First, six sequential impact loads were applied to the t...

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Autores principales:	Chayanon Hansapinyo, Suchart Limkatanyu, Hexin Zhang, Thanongsak Imjai
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	sequential impact axial load stirrup residual resistance index shear plug Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/eb4b741301a848fe82bfe8435e5061ec
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spelling	oai:doaj.org-article:eb4b741301a848fe82bfe8435e5061ec2021-11-25T16:59:42ZResidual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads10.3390/buildings111105182075-5309https://doaj.org/article/eb4b741301a848fe82bfe8435e5061ec2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-5309/11/11/518https://doaj.org/toc/2075-5309Sequential small impact loads may not collapse structures directly but could weaken the strength of structures. This study aimed to investigate the impact of these sequential small impact loads on the strength of the reinforced concrete beams. First, six sequential impact loads were applied to the test specimens. Then, the residual static capacity of the impacted specimens was determined by the ultimate static load test, compared with those of undamaged specimens. The experiment was composed of 12 specimens having identical dimensions. The variable parameters were the magnitude of the axial load and shear reinforcement. Under the sequential small impacts, the axial load improves the impact performance. It reduces the tensile strain of the longitudinal reinforcement. Hence, the flexural tensile crack propagation is limited. In addition, the local damage at the impact location is minimized and the shear plug induced diagonal shear crack is prevented. The axial force is also able to diminish the adverse effect of the large spacing stirrups. Large impact load could alter the failure of a designed flexural critical reinforced concrete beam without axial load to the shear failure. Although the axial load improves the impact response, the Residual Resistance Index (<i>RRI</i>) decreases with axial load. For the damaged specimens with axial load, the ultimate static load is lower than the calculated concrete shear capacity and more severe diagonal shear cracks were found. It can be obviously said that the prior impact damage decreases the concrete shear capacity.Chayanon HansapinyoSuchart LimkatanyuHexin ZhangThanongsak ImjaiMDPI AGarticlesequential impactaxial loadstirrupresidual resistance indexshear plugBuilding constructionTH1-9745ENBuildings, Vol 11, Iss 518, p 518 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sequential impact axial load stirrup residual resistance index shear plug Building construction TH1-9745
spellingShingle	sequential impact axial load stirrup residual resistance index shear plug Building construction TH1-9745 Chayanon Hansapinyo Suchart Limkatanyu Hexin Zhang Thanongsak Imjai Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
description	Sequential small impact loads may not collapse structures directly but could weaken the strength of structures. This study aimed to investigate the impact of these sequential small impact loads on the strength of the reinforced concrete beams. First, six sequential impact loads were applied to the test specimens. Then, the residual static capacity of the impacted specimens was determined by the ultimate static load test, compared with those of undamaged specimens. The experiment was composed of 12 specimens having identical dimensions. The variable parameters were the magnitude of the axial load and shear reinforcement. Under the sequential small impacts, the axial load improves the impact performance. It reduces the tensile strain of the longitudinal reinforcement. Hence, the flexural tensile crack propagation is limited. In addition, the local damage at the impact location is minimized and the shear plug induced diagonal shear crack is prevented. The axial force is also able to diminish the adverse effect of the large spacing stirrups. Large impact load could alter the failure of a designed flexural critical reinforced concrete beam without axial load to the shear failure. Although the axial load improves the impact response, the Residual Resistance Index (<i>RRI</i>) decreases with axial load. For the damaged specimens with axial load, the ultimate static load is lower than the calculated concrete shear capacity and more severe diagonal shear cracks were found. It can be obviously said that the prior impact damage decreases the concrete shear capacity.
format	article
author	Chayanon Hansapinyo Suchart Limkatanyu Hexin Zhang Thanongsak Imjai
author_facet	Chayanon Hansapinyo Suchart Limkatanyu Hexin Zhang Thanongsak Imjai
author_sort	Chayanon Hansapinyo
title	Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
title_short	Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
title_full	Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
title_fullStr	Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
title_full_unstemmed	Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
title_sort	residual strength of reinforced concrete beams under sequential small impact loads
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/eb4b741301a848fe82bfe8435e5061ec
work_keys_str_mv	AT chayanonhansapinyo residualstrengthofreinforcedconcretebeamsundersequentialsmallimpactloads AT suchartlimkatanyu residualstrengthofreinforcedconcretebeamsundersequentialsmallimpactloads AT hexinzhang residualstrengthofreinforcedconcretebeamsundersequentialsmallimpactloads AT thanongsakimjai residualstrengthofreinforcedconcretebeamsundersequentialsmallimpactloads
_version_	1718412811129847808

Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads

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