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Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams
To investigate the normal section strength and cracking bending moment of normal concrete–ultra-high-performance concrete (NC-UHPC) composite beams, calculation formulas were established considering the tensile strength of UHPC based on the current railway bridge design code. Using the railway T-bea...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9863072/ https://www.ncbi.nlm.nih.gov/pubmed/36676616 http://dx.doi.org/10.3390/ma16020879 |
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author | Lin, Pengzhen Yan, Weiyi Zhao, Hongwei Ma, Junjun |
author_facet | Lin, Pengzhen Yan, Weiyi Zhao, Hongwei Ma, Junjun |
author_sort | Lin, Pengzhen |
collection | PubMed |
description | To investigate the normal section strength and cracking bending moment of normal concrete–ultra-high-performance concrete (NC-UHPC) composite beams, calculation formulas were established considering the tensile strength of UHPC based on the current railway bridge design code. Using the railway T-beam as a template, prestressed NC-UHPC composite beams with different NC layer heights were built. A static bending test was performed, the pressure of the steel strand and the deflection and strain of the beam were measured, and the evolution of cracks in each beam was observed. The calculation formulas of the normal section strength and cracking bending moment of NC-UHPC composite beam were verified by the test. The results showed that the type of strain was similar to load-deflection curves with increasing load; the bending failure process of the NC-UHPC composite beam showed four obvious stages: elasticity, uniform cracking, crack development, and yield. Cracks in the beam started to appear at stage II, developed rapidly at stage III, and stopped emerging at stage IV. The calculation formulas for the normal section strength and the cracking bending moment of the NC-UHPC composite beam were in good agreement with the test values. Normal concrete with a compressive strength of 80 MPa can replace UHPC for the design of NC-UHPC composite beams. |
format | Online Article Text |
id | pubmed-9863072 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-98630722023-01-22 Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams Lin, Pengzhen Yan, Weiyi Zhao, Hongwei Ma, Junjun Materials (Basel) Article To investigate the normal section strength and cracking bending moment of normal concrete–ultra-high-performance concrete (NC-UHPC) composite beams, calculation formulas were established considering the tensile strength of UHPC based on the current railway bridge design code. Using the railway T-beam as a template, prestressed NC-UHPC composite beams with different NC layer heights were built. A static bending test was performed, the pressure of the steel strand and the deflection and strain of the beam were measured, and the evolution of cracks in each beam was observed. The calculation formulas of the normal section strength and cracking bending moment of NC-UHPC composite beam were verified by the test. The results showed that the type of strain was similar to load-deflection curves with increasing load; the bending failure process of the NC-UHPC composite beam showed four obvious stages: elasticity, uniform cracking, crack development, and yield. Cracks in the beam started to appear at stage II, developed rapidly at stage III, and stopped emerging at stage IV. The calculation formulas for the normal section strength and the cracking bending moment of the NC-UHPC composite beam were in good agreement with the test values. Normal concrete with a compressive strength of 80 MPa can replace UHPC for the design of NC-UHPC composite beams. MDPI 2023-01-16 /pmc/articles/PMC9863072/ /pubmed/36676616 http://dx.doi.org/10.3390/ma16020879 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Lin, Pengzhen Yan, Weiyi Zhao, Hongwei Ma, Junjun Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams |
title | Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams |
title_full | Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams |
title_fullStr | Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams |
title_full_unstemmed | Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams |
title_short | Theoretical and Experimental Investigation on the Flexural Behaviour of Prestressed NC-UHPC Composite Beams |
title_sort | theoretical and experimental investigation on the flexural behaviour of prestressed nc-uhpc composite beams |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9863072/ https://www.ncbi.nlm.nih.gov/pubmed/36676616 http://dx.doi.org/10.3390/ma16020879 |
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