Web crippling of cold-formed thin-walled steel cassettes

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Kaitila, Olli
dc.date.accessioned 2012-02-13T12:59:34Z
dc.date.available 2012-02-13T12:59:34Z
dc.date.issued 2004-10-22
dc.identifier.isbn 951-22-7270-9
dc.identifier.issn 1456-4327
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2463
dc.description.abstract The resistance of cold-formed thin-walled cassettes against local transverse forces, i.e. the web crippling capacity, was investigated. The web crippling of cassettes, or liner trays as they are also called, was studied both experimentally and numerically using finite element modelling. Both unreinforced (flat) cassette webs and webs with longitudinal stiffeners situated on only one side of the web mid-line were studied. The calculation of the web crippling capacity of this type of stiffened webs is not included in current design codes. However, if cassettes are designed as continuous over two or more spans, the resistance against local transverse forces has to be verified. It should be noted that the original purpose of the stiffener in cassette webs is to increase the bending moment capacity by increasing the effective area of the compressed part of the web when cassettes are designed as single-span structures, in which case web crippling does not usually become critical. A total of 52 structural tests were carried out on specially manufactured single cassette web sections and built-up cassette structures. Both interior two-flange and interior one-flange loading were considered. The calculation rules for unreinforced webs given in current design codes were found to be relatively conservative in comparison to the test results. Finite element models were developed and validated on the basis of the test results and very good agreement was achieved. These models were used as a starting point for a parametric study of the influence of different cross-sectional parameters on the resistance against local transverse forces of longitudinally stiffened webs. Also the influence of the load bearing length was included in the study. Recommendations concerning the design of the cassette web section are given based on the results. It was shown that the use of a longitudinal stiffener of the studied type in fact reduces the web crippling capacity by at least 10 % in comparison to a similar cassette with an unreinforced web. Depending on the stiffener's geometry, the reduction can be considerably larger. A reduction factor equal to 0.7 - 0.9 should be used for the type of longitudinally stiffened webs considered in this study in connection with the design code formulae for the resistance of unreinforced webs against local transverse forces, depending on the cross-section geometry. en
dc.format.extent 189
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Helsinki University of Technology Laboratory of Steel Structure publications en
dc.relation.ispartofseries 30 en
dc.subject.other Civil engineering en
dc.title Web crippling of cold-formed thin-walled steel cassettes en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Civil and Environmental Engineering en
dc.contributor.department Rakennus- ja ympäristötekniikan osasto fi
dc.subject.keyword cold-formed steel en
dc.subject.keyword cassette en
dc.subject.keyword liner tray en
dc.subject.keyword web crippling en
dc.subject.keyword local transverse forces en
dc.subject.keyword parametric study en
dc.identifier.urn urn:nbn:fi:tkk-004262
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Laboratory of Steel Structures en
dc.contributor.lab Teräsrakennetekniikan laboratorio fi

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