Seismic collapse capacity analysis of degrading SDOF system with negative-positive-uncoupled stiffness mechanism

Seismic collapse capacity analysis of degrading SDOF system with negative-positive-uncoupled stiffness mechanism | 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 Article Seismic collapse capacity analysis of degrading SDOF system with negative-positive-uncoupled stiffness mechanism Yue Liu, FeiFei Sun, DeFeng Xu, JiaQi Yang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5670379/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 09 Apr, 2025 Read the published version in Scientific Reports → Version 1 posted 11 You are reading this latest preprint version Abstract The negative-positive-uncoupled stiffness device (NPUSD) is a novel variable stiffness system recently proposed by the authors, which can efficiently and economically achieve the structural multi-level seismic fortification. The main objective of this research is to combine the NPUSD with the viscous damper in parallel to form an innovative negative-positive-uncoupled stiffness amplifying damper (NPUSAD), and to establish the collapse capacity spectra of a degrading single-degree-of-freedom (SDOF) with additional NPUSAD under three different record sets. The study investigates the influence of parameters of the SDOF structural element and NPUSAD on the collapse capacity spectra of this system. The results indicate that the NPUSAD-SDOF system significantly enhances the collapse resistance of long-period structures, with improvements of 30%, 40%, and 50% under far-field non-impulsive, near-field non-impulsive, and near-field impulsive seismic record sets, respectively. Among the parameters of structural element, the ductility ratio, soften stiffness coefficient, and stability coefficient have a significant impact on the collapse capacity spectra, while for the NPUSAD parameters, the transition displacement ratio has a greater influence than the positive-to-negative stiffness ratio, which in turn has a greater influence than the connecting stiffness ratio. Physical sciences/Engineering Physical sciences/Engineering/Civil engineering Negative-positive-uncoupled stiffness amplifying damper Negative-positive-uncoupled stiffness mechanism NPUSAD-SDOF system Seismic collapse capacity Collapse capacity spectra Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 09 Apr, 2025 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 11 Feb, 2025 Reviews received at journal 02 Feb, 2025 Reviewers agreed at journal 16 Jan, 2025 Reviewers agreed at journal 08 Jan, 2025 Reviews received at journal 05 Jan, 2025 Reviewers agreed at journal 29 Dec, 2024 Reviewers invited by journal 28 Dec, 2024 Editor assigned by journal 27 Dec, 2024 Editor invited by journal 27 Dec, 2024 Submission checks completed at journal 27 Dec, 2024 First submitted to journal 18 Dec, 2024 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. 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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-5670379","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":395450084,"identity":"87be64a2-8501-4776-b83b-c7bcc1dc522b","order_by":0,"name":"Yue Liu","email":"","orcid":"","institution":"Tongji University","correspondingAuthor":false,"prefix":"","firstName":"Yue","middleName":"","lastName":"Liu","suffix":""},{"id":395450085,"identity":"029937fc-da35-4d67-b0b7-bdb3de17e65b","order_by":1,"name":"FeiFei Sun","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA00lEQVRIiWNgGAWjYBAC9uYDQLICzE4AMpkJa+E5lgAkzxiQqoWxzQDGJ0YLG/sz6cJ5f+TM+Rc8PMBQYZ3YwH72AAEtPGbSM7cZGFvOeAB02Jn0xAaevAS8Wuzle9ikebcZJG64cSDhAGPb4cQGCR4DvFrADuOdA9PyjygtDGbSvA1ALecbgFoaiNLCY2zNc8zY2OAGMJATjqUbt/HkEHTYw9s8NXJyBufPJH/4UGMt289+Br8WBJDISWBIANJsRKoHAv7jB4hXPApGwSgYBSMKAAC1QkPOPYtfbgAAAABJRU5ErkJggg==","orcid":"","institution":"Tongji University","correspondingAuthor":true,"prefix":"","firstName":"FeiFei","middleName":"","lastName":"Sun","suffix":""},{"id":395450086,"identity":"d9b4a466-1f16-4274-9e89-d1ed4a8cf92a","order_by":2,"name":"DeFeng Xu","email":"","orcid":"","institution":"Tongji University","correspondingAuthor":false,"prefix":"","firstName":"DeFeng","middleName":"","lastName":"Xu","suffix":""},{"id":395450087,"identity":"08f18e70-a61b-4eb0-ae9a-98cdd2657809","order_by":3,"name":"JiaQi Yang","email":"","orcid":"","institution":"Tongji University","correspondingAuthor":false,"prefix":"","firstName":"JiaQi","middleName":"","lastName":"Yang","suffix":""}],"badges":[],"createdAt":"2024-12-18 14:38:19","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-5670379/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-5670379/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1038/s41598-025-91919-8","type":"published","date":"2025-04-09T16:05:33+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":80558644,"identity":"19ebd59b-6a6d-437a-b6ca-68a114d8ec36","added_by":"auto","created_at":"2025-04-14 16:15:27","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":2067514,"visible":true,"origin":"","legend":"","description":"","filename":"manuscriptsubmission.pdf","url":"https://assets-eu.researchsquare.com/files/rs-5670379/v1_covered_84467afa-301c-47fa-813c-ea1b916129d8.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Seismic collapse capacity analysis of degrading SDOF system with negative-positive-uncoupled stiffness mechanism","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"scientific-reports","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"scirep","sideBox":"Learn more about [Scientific Reports](http://www.nature.com/srep/)","snPcode":"","submissionUrl":"","title":"Scientific Reports","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Scientific Reports","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Negative-positive-uncoupled stiffness amplifying damper, Negative-positive-uncoupled stiffness mechanism, NPUSAD-SDOF system, Seismic collapse capacity, Collapse capacity spectra","lastPublishedDoi":"10.21203/rs.3.rs-5670379/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-5670379/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe negative-positive-uncoupled stiffness device (NPUSD) is a novel variable stiffness system recently proposed by the authors, which can efficiently and economically achieve the structural multi-level seismic fortification. 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