Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement

Moment redistribution (MR), a nonlinear behavior occurring in continuous reinforced concrete (RC) beams, is related to the redistributed section's ductility and the stiffness distribution along the whole beam. The use of high-strength steel (HSS) reinforcement could affect the redistributed sec...

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Main Authors: Luo, Da, Li, Bing
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/169133
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1691332023-07-03T04:05:19Z Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement Luo, Da Li, Bing School of Civil and Environmental Engineering Engineering::Civil engineering Moment Redistribution Continuous Beams Moment redistribution (MR), a nonlinear behavior occurring in continuous reinforced concrete (RC) beams, is related to the redistributed section's ductility and the stiffness distribution along the whole beam. The use of high-strength steel (HSS) reinforcement could affect the redistributed section's ductility and can delay or even prevent the formation of plastic hinge after another. The lack of research regarding the influence of those phenomena on MR is one of the reasons that hinder design engineers from using HSS. This paper conducts a broad-range parametric study through finite element (FE) method to check if the design provisions on MR are still applicable to beams with HSS reinforcement of yield strength of more than 600 MPa. The critical sections' yield state (whether the plastic hinge is formed) at the ultimate limit state (ULS) and its influences on MR are investigated. The study demonstrations that the MR capacity decreases with the increase in yield strength of reinforcement, especially when the midspan section cannot yield at ULS due to the use of HSS reinforcement. Besides, the yield state is influenced by the coupling effect of multi-parameters and significantly affects the influence degree of each parameter on MR. A new method considering the yield state is proposed to estimate the MR capacity of the continuous beams. This method's reasonable accuracy is proved. It is recommended to reduce the specified MR by about 6% for every 100 MPa increase in yield strength of reinforcement. The research described in this paper was financially supported by the Fundamental Research Funds for the Central Universities, CHD (300102282106). 2023-07-03T04:05:19Z 2023-07-03T04:05:19Z 2023 Journal Article Luo, D. & Li, B. (2023). Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement. Structures, 51, 13-24. https://dx.doi.org/10.1016/j.istruc.2023.03.005 2352-0124 https://hdl.handle.net/10356/169133 10.1016/j.istruc.2023.03.005 2-s2.0-85149875924 51 13 24 en Structures © 2023 Institution of Structural Engineers. Published by Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Moment Redistribution
Continuous Beams
spellingShingle Engineering::Civil engineering
Moment Redistribution
Continuous Beams
Luo, Da
Li, Bing
Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement
description Moment redistribution (MR), a nonlinear behavior occurring in continuous reinforced concrete (RC) beams, is related to the redistributed section's ductility and the stiffness distribution along the whole beam. The use of high-strength steel (HSS) reinforcement could affect the redistributed section's ductility and can delay or even prevent the formation of plastic hinge after another. The lack of research regarding the influence of those phenomena on MR is one of the reasons that hinder design engineers from using HSS. This paper conducts a broad-range parametric study through finite element (FE) method to check if the design provisions on MR are still applicable to beams with HSS reinforcement of yield strength of more than 600 MPa. The critical sections' yield state (whether the plastic hinge is formed) at the ultimate limit state (ULS) and its influences on MR are investigated. The study demonstrations that the MR capacity decreases with the increase in yield strength of reinforcement, especially when the midspan section cannot yield at ULS due to the use of HSS reinforcement. Besides, the yield state is influenced by the coupling effect of multi-parameters and significantly affects the influence degree of each parameter on MR. A new method considering the yield state is proposed to estimate the MR capacity of the continuous beams. This method's reasonable accuracy is proved. It is recommended to reduce the specified MR by about 6% for every 100 MPa increase in yield strength of reinforcement.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Luo, Da
Li, Bing
format Article
author Luo, Da
Li, Bing
author_sort Luo, Da
title Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement
title_short Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement
title_full Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement
title_fullStr Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement
title_full_unstemmed Moment redistribution capacity of continuous RC beams with high-strength steel reinforcement
title_sort moment redistribution capacity of continuous rc beams with high-strength steel reinforcement
publishDate 2023
url https://hdl.handle.net/10356/169133
_version_ 1772825749556822016