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Response of Connections between Concrete Corbels and Safety Barriers

Post-installed anchor systems are widely used in several applications both for retrofit and new constructions due to their flexibility and easiness of installation. For these reasons, their use is very common to connect safety barriers to concrete corbels. However, the design requirements for fasten...

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Autores principales: Cattaneo, Sara, Crespi, Pietro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947235/
https://www.ncbi.nlm.nih.gov/pubmed/31817980
http://dx.doi.org/10.3390/ma12244103
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author Cattaneo, Sara
Crespi, Pietro
author_facet Cattaneo, Sara
Crespi, Pietro
author_sort Cattaneo, Sara
collection PubMed
description Post-installed anchor systems are widely used in several applications both for retrofit and new constructions due to their flexibility and easiness of installation. For these reasons, their use is very common to connect safety barriers to concrete corbels. However, the design requirements for fastening (Eurocode 2—Part 4, ACI 318 or for post-installed rebar (Eurocode 2-Part 1 can be hardly satisfied due to the geometric restrictions of the application. Additional complications arise for the refurbishment of bridge corbels, which usually requires the removal of the damaged top concrete layer. This paper presents a new anchoring system that consists of the use of additional post-installed U-shaped rebars connecting the lower existing portion of the corbel to the upper (rebuilt) layer, able to carry the required design loads. The proposed solution considers three anchors that transfer the external loads to the corbel, to the existing reinforcements, and to the U-shaped rebars. The system is tested experimentally and validated by using both theoretical (strut and tie modeling) and numerical analyses.
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spelling pubmed-69472352020-01-13 Response of Connections between Concrete Corbels and Safety Barriers Cattaneo, Sara Crespi, Pietro Materials (Basel) Article Post-installed anchor systems are widely used in several applications both for retrofit and new constructions due to their flexibility and easiness of installation. For these reasons, their use is very common to connect safety barriers to concrete corbels. However, the design requirements for fastening (Eurocode 2—Part 4, ACI 318 or for post-installed rebar (Eurocode 2-Part 1 can be hardly satisfied due to the geometric restrictions of the application. Additional complications arise for the refurbishment of bridge corbels, which usually requires the removal of the damaged top concrete layer. This paper presents a new anchoring system that consists of the use of additional post-installed U-shaped rebars connecting the lower existing portion of the corbel to the upper (rebuilt) layer, able to carry the required design loads. The proposed solution considers three anchors that transfer the external loads to the corbel, to the existing reinforcements, and to the U-shaped rebars. The system is tested experimentally and validated by using both theoretical (strut and tie modeling) and numerical analyses. MDPI 2019-12-08 /pmc/articles/PMC6947235/ /pubmed/31817980 http://dx.doi.org/10.3390/ma12244103 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cattaneo, Sara
Crespi, Pietro
Response of Connections between Concrete Corbels and Safety Barriers
title Response of Connections between Concrete Corbels and Safety Barriers
title_full Response of Connections between Concrete Corbels and Safety Barriers
title_fullStr Response of Connections between Concrete Corbels and Safety Barriers
title_full_unstemmed Response of Connections between Concrete Corbels and Safety Barriers
title_short Response of Connections between Concrete Corbels and Safety Barriers
title_sort response of connections between concrete corbels and safety barriers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947235/
https://www.ncbi.nlm.nih.gov/pubmed/31817980
http://dx.doi.org/10.3390/ma12244103
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