Cargando…

Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings

The construction industry is on the lookout for cost-effective structural members that are also environmentally friendly. Built-up cold-formed steel (CFS) sections with minimal thickness can be used to make beams at a lower cost. Plate buckling in CFS beams with thin webs can be avoided by using thi...

Descripción completa

Detalles Bibliográficos
Autores principales: Samuel, James, Nair, Shalini Ramachandran, Joanna, Philip Saratha, Gurupatham, Beulah Gnana Ananthi, Roy, Krishanu, Lim, James Boon Piang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10143601/
https://www.ncbi.nlm.nih.gov/pubmed/37109841
http://dx.doi.org/10.3390/ma16083002
_version_ 1785033892480155648
author Samuel, James
Nair, Shalini Ramachandran
Joanna, Philip Saratha
Gurupatham, Beulah Gnana Ananthi
Roy, Krishanu
Lim, James Boon Piang
author_facet Samuel, James
Nair, Shalini Ramachandran
Joanna, Philip Saratha
Gurupatham, Beulah Gnana Ananthi
Roy, Krishanu
Lim, James Boon Piang
author_sort Samuel, James
collection PubMed
description The construction industry is on the lookout for cost-effective structural members that are also environmentally friendly. Built-up cold-formed steel (CFS) sections with minimal thickness can be used to make beams at a lower cost. Plate buckling in CFS beams with thin webs can be avoided by using thick webs, adding stiffeners, or strengthening the web with diagonal rebars. When CFS beams are designed to carry heavy loads, their depth logically increases, resulting in an increase in building floor height. The experimental and numerical investigation of CFS composite beams reinforced with diagonal web rebars is presented in this paper. A total of twelve built-up CFS beams were used for testing, with the first six designed without web encasement and the remaining six designed with web encasement. The first six were constructed with diagonal rebars in the shear and flexure zones, while the other two with diagonal rebars in the shear zone, and the last two without diagonal rebars. The next set of six beams was constructed in the same manner, but with a concrete encasement of the web, and all the beams were then tested. Fly ash, a pozzolanic waste byproduct of thermal power plants, was used as a 40% replacement for cement in making the test specimens. CFS beam failure characteristics, load–deflection behavior, ductility, load–strain relationship, moment–curvature relationship, and lateral stiffness were all investigated. The results of the experimental tests and the nonlinear finite element analysis performed in ANSYS software were found to be in good agreement. It was discovered that CFS beams with fly ash concrete encased webs have twice the moment resisting capacity of plain CFS beams, resulting in a reduction in building floor height. The results also confirmed that the composite CFS beams have high ductility, making them a reliable choice for earthquake-resistant structures.
format Online
Article
Text
id pubmed-10143601
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-101436012023-04-29 Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings Samuel, James Nair, Shalini Ramachandran Joanna, Philip Saratha Gurupatham, Beulah Gnana Ananthi Roy, Krishanu Lim, James Boon Piang Materials (Basel) Article The construction industry is on the lookout for cost-effective structural members that are also environmentally friendly. Built-up cold-formed steel (CFS) sections with minimal thickness can be used to make beams at a lower cost. Plate buckling in CFS beams with thin webs can be avoided by using thick webs, adding stiffeners, or strengthening the web with diagonal rebars. When CFS beams are designed to carry heavy loads, their depth logically increases, resulting in an increase in building floor height. The experimental and numerical investigation of CFS composite beams reinforced with diagonal web rebars is presented in this paper. A total of twelve built-up CFS beams were used for testing, with the first six designed without web encasement and the remaining six designed with web encasement. The first six were constructed with diagonal rebars in the shear and flexure zones, while the other two with diagonal rebars in the shear zone, and the last two without diagonal rebars. The next set of six beams was constructed in the same manner, but with a concrete encasement of the web, and all the beams were then tested. Fly ash, a pozzolanic waste byproduct of thermal power plants, was used as a 40% replacement for cement in making the test specimens. CFS beam failure characteristics, load–deflection behavior, ductility, load–strain relationship, moment–curvature relationship, and lateral stiffness were all investigated. The results of the experimental tests and the nonlinear finite element analysis performed in ANSYS software were found to be in good agreement. It was discovered that CFS beams with fly ash concrete encased webs have twice the moment resisting capacity of plain CFS beams, resulting in a reduction in building floor height. The results also confirmed that the composite CFS beams have high ductility, making them a reliable choice for earthquake-resistant structures. MDPI 2023-04-10 /pmc/articles/PMC10143601/ /pubmed/37109841 http://dx.doi.org/10.3390/ma16083002 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
Samuel, James
Nair, Shalini Ramachandran
Joanna, Philip Saratha
Gurupatham, Beulah Gnana Ananthi
Roy, Krishanu
Lim, James Boon Piang
Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
title Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
title_full Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
title_fullStr Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
title_full_unstemmed Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
title_short Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings
title_sort composite cold-formed steel beams with diagonal rebars for earthquake-resistant buildings
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10143601/
https://www.ncbi.nlm.nih.gov/pubmed/37109841
http://dx.doi.org/10.3390/ma16083002
work_keys_str_mv AT samueljames compositecoldformedsteelbeamswithdiagonalrebarsforearthquakeresistantbuildings
AT nairshaliniramachandran compositecoldformedsteelbeamswithdiagonalrebarsforearthquakeresistantbuildings
AT joannaphilipsaratha compositecoldformedsteelbeamswithdiagonalrebarsforearthquakeresistantbuildings
AT gurupathambeulahgnanaananthi compositecoldformedsteelbeamswithdiagonalrebarsforearthquakeresistantbuildings
AT roykrishanu compositecoldformedsteelbeamswithdiagonalrebarsforearthquakeresistantbuildings
AT limjamesboonpiang compositecoldformedsteelbeamswithdiagonalrebarsforearthquakeresistantbuildings