Numerical modelling, parametric analysis and design of UHPFRC beams exposed to fire

Numerical modelling, parametric analysis and design of UHPFRC beams exposed to fire | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Numerical modelling, parametric analysis and design of UHPFRC beams exposed to fire Lenganji Simwanda, Charles Kahanji, Faris Ali This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-1582849/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 31 May, 2023 Read the published version in Structures → Version 1 posted You are reading this latest preprint version Abstract A non-linear sequentially-coupled thermal-mechanical finite element (FE) paradigm that reasonably tracks the coupled fire-structure response of ultra-high performance fibre reinforced concrete (UHPFRC) beams subjected to the ISO 834 fire is established and presented. A fire resistance parameter study is conducted on UHPFRC beams via the developed FE paradigm, and then flexural based fire-structural assessment is demonstrated, as an avenue to substantiate the viability of numerical performance-based structural fire design The parameter study considered two variables, notably heating mechanism and load levels. Comparison of results revealed that the fire-structure response was more severe under the hydrocarbon than the ISO834 heating mechanism and hydrocarbon fire resistance ratings estimation were found to be 30 minutes lower than those determined using the ISO 834 fire. Predicted failure of the beams under the ISO 834 and hydrocarbon fires was observed at load ratios exceeding 0.6 and 0.4, respectively. By reposing on ACI544’s analytical model for UHPFRC beams in flexure, and numerically acquired heat-transfer response, the time-variant reduced nominal moment capacities of UHPFRC beams were computed. Failure predicted via computed residual moment capacities was somewhat consistent with that reckoned by load ratio parameter study. Civil Engineering UHPFRC ISO-834 fire Hydrocarbon fire ACI544 Residual moment capacity Full Text Cite Share Download PDF Status: Published Journal Publication published 31 May, 2023 Read the published version in Structures → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-1582849","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":100808790,"identity":"1c07576b-bca0-41cd-8337-5de18e439290","order_by":0,"name":"Lenganji Simwanda","email":"data:image/png;base64,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","orcid":"","institution":"University of Zambia","correspondingAuthor":true,"submittingAuthor":false,"prefix":"","firstName":"Lenganji","middleName":"","lastName":"Simwanda","suffix":""},{"id":100808791,"identity":"98fb978c-078b-4da7-8fa5-f2331243a535","order_by":1,"name":"Charles Kahanji","email":"","orcid":"","institution":"University of Zambia","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Charles","middleName":"","lastName":"Kahanji","suffix":""},{"id":100808792,"identity":"eccfafda-c839-4c06-bcf5-c6ebbb5a5ad2","order_by":2,"name":"Faris Ali","email":"","orcid":"","institution":"Ulster University","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Faris","middleName":"","lastName":"Ali","suffix":""}],"badges":[],"createdAt":"2022-04-22 04:52:18","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-1582849/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-1582849/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1016/j.istruc.2023.03.155","type":"published","date":"2023-06-01T00:00:00+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":20773745,"identity":"f957506d-fb9b-429d-86fb-eaef810cadbf","added_by":"auto","created_at":"2022-04-26 13:07:07","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1244642,"visible":true,"origin":"","legend":"","description":"","filename":"uhpfrcfiresubmit1.pdf","url":"https://assets-eu.researchsquare.com/files/rs-1582849/v1_covered.pdf"}],"financialInterests":"","formattedTitle":"\u003cp\u003eNumerical modelling, parametric analysis and design of UHPFRC beams exposed to fire\u003c/p\u003e","fulltext":[{"header":"Full Text","content":"This preprint is available for \u003ca href='/article/rs-1582849/latest.pdf' target='_blank'\u003edownload as a PDF\u003c/a\u003e."}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":false,"highlight":"","institution":"University of Zambia","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"UHPFRC, ISO-834 fire, Hydrocarbon fire, ACI544, Residual moment capacity","lastPublishedDoi":"10.21203/rs.3.rs-1582849/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-1582849/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eA non-linear sequentially-coupled thermal-mechanical finite element (FE) paradigm that reasonably tracks the coupled fire-structure response of ultra-high performance fibre reinforced concrete (UHPFRC) beams subjected to the ISO 834 fire is established and presented. A fire resistance parameter study is conducted on UHPFRC beams via the developed FE paradigm, and then flexural based fire-structural assessment is demonstrated, as an avenue to substantiate the viability of numerical performance-based structural fire design The parameter study considered two variables, notably heating mechanism and load levels. Comparison of results revealed that the fire-structure response was more severe under the hydrocarbon than the ISO834 heating mechanism and hydrocarbon fire resistance ratings estimation were found to be 30 minutes lower than those determined using the ISO 834 fire. Predicted failure of the beams under the ISO 834 and hydrocarbon fires was observed at load ratios exceeding 0.6 and 0.4, respectively. By reposing on ACI544’s analytical model for UHPFRC beams in flexure, and numerically acquired heat-transfer response, the time-variant reduced nominal moment capacities of UHPFRC beams were computed. 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