Analysis and Design Assumptions for Continuous Cold-Formed Purlins.
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| Title: | Analysis and Design Assumptions for Continuous Cold-Formed Purlins. |
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| Authors: | Epstein, Howard I., Murtha-Smith, Erling, Mitchell, Jason D. |
| Source: | Practice Periodical on Structural Design & Construction. May98, Vol. 3 Issue 2, p60. 8p. 3 Diagrams, 5 Graphs. |
| Subjects: | Roof design & construction, Steelwork, Structural engineering |
| Abstract: | In the design of continuous roof purlins or wind girts made of cold-formed steel members, several assumptions in analysis and design are commonly made. Typically, these continuous members are Z- or C-shaped. Continuous through fastening between cold-formed decks or panels and one of the flanges of the purlin or girt has been the usual method of providing lateral bracing. With the increasing popularity of standing-seam roofs, discrete point bracing of the underlying roof purlins is becoming fairly common. In either case, because the bending moment changes sign in these continuous elements, there are regions where the compression flange is not continuously braced. The lateral-torsional buckling mode of failure frequently governs design strength. This paper addresses the assumptions made in the analysis and design of these continuous elements, shows the effects and questions the appropriateness of many of the assumptions, and presents safety concerns. The examples presented are for continuous Z-purlins subjected to gravity loading. The conclusions reached, however, are entirely applicable to other shapes, other loading, and other applications, such as continuous girts. [ABSTRACT FROM AUTHOR] |
| Copyright of Practice Periodical on Structural Design & Construction is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 6786184 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Analysis and Design Assumptions for Continuous Cold-Formed Purlins. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Epstein%2C+Howard+I%2E%22">Epstein, Howard I.</searchLink><br /><searchLink fieldCode="AR" term="%22Murtha-Smith%2C+Erling%22">Murtha-Smith, Erling</searchLink><br /><searchLink fieldCode="AR" term="%22Mitchell%2C+Jason+D%2E%22">Mitchell, Jason D.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Practice+Periodical+on+Structural+Design+%26+Construction%22">Practice Periodical on Structural Design & Construction</searchLink>. May98, Vol. 3 Issue 2, p60. 8p. 3 Diagrams, 5 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Roof+design+%26+construction%22">Roof design & construction</searchLink><br /><searchLink fieldCode="DE" term="%22Steelwork%22">Steelwork</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+engineering%22">Structural engineering</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In the design of continuous roof purlins or wind girts made of cold-formed steel members, several assumptions in analysis and design are commonly made. Typically, these continuous members are Z- or C-shaped. Continuous through fastening between cold-formed decks or panels and one of the flanges of the purlin or girt has been the usual method of providing lateral bracing. With the increasing popularity of standing-seam roofs, discrete point bracing of the underlying roof purlins is becoming fairly common. In either case, because the bending moment changes sign in these continuous elements, there are regions where the compression flange is not continuously braced. The lateral-torsional buckling mode of failure frequently governs design strength. This paper addresses the assumptions made in the analysis and design of these continuous elements, shows the effects and questions the appropriateness of many of the assumptions, and presents safety concerns. The examples presented are for continuous Z-purlins subjected to gravity loading. The conclusions reached, however, are entirely applicable to other shapes, other loading, and other applications, such as continuous girts. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Practice Periodical on Structural Design & Construction is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1061/(ASCE)1084-0680(1998)3:2(60) Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 60 Subjects: – SubjectFull: Roof design & construction Type: general – SubjectFull: Steelwork Type: general – SubjectFull: Structural engineering Type: general Titles: – TitleFull: Analysis and Design Assumptions for Continuous Cold-Formed Purlins. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Epstein, Howard I. – PersonEntity: Name: NameFull: Murtha-Smith, Erling – PersonEntity: Name: NameFull: Mitchell, Jason D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May98 Type: published Y: 1998 Identifiers: – Type: issn-print Value: 10840680 Numbering: – Type: volume Value: 3 – Type: issue Value: 2 Titles: – TitleFull: Practice Periodical on Structural Design & Construction Type: main |
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