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dc.date.accessioned2013-03-12T08:19:21Z
dc.date.available2013-03-12T08:19:21Z
dc.date.issued2008en_US
dc.date.submitted2011-04-20en_US
dc.identifier.urihttp://hdl.handle.net/10852/10175
dc.description.abstractPresent approximate second order methods for the analysis of unbraced multistorey frames may significantly underestimate moments in single curvature regions. To clarify reasons for this that may not be well understood, the mechanics of column interaction in single curvature regions are studied. Suitable tools for sidesway description are derived, including a nearly exact, explicit free-sway effective length expression, that, when high accuracy is required, eliminates the need for cumbersome, iterative solutions of exact effective lengths from the transcendental instability equation. Two reasons for the underestimation are identified. One is related to the local second order "N-delta" effects, and the other to second order effects causing changes in rotational restraint stiffness at column ends due to vertical, inter-storey column interaction. A modified approximate storey magnifier approach is proposed that accounts for these local second order effects through two separate "flexibility factors". The approach is sufficiently simple to be viable in practical analyses, and predictions are found to compare well with more accurate results.eng
dc.language.isonoben_US
dc.publisherMatematisk Institutt, Universitetet i Oslo
dc.relation.ispartofPreprint series. Research Report in Mechanics http://urn.nb.no/URN:NBN:no-23419
dc.relation.urihttp://urn.nb.no/URN:NBN:no-23419
dc.titleApproximate second order analysis of unbraced frames reflecting inter-storey interaction in single curvature regionsen_US
dc.typeResearch reporten_US
dc.date.updated2011-04-20en_US
dc.creator.authorHellesland, Josteinen_US
dc.subject.nsiVDP::410en_US
dc.identifier.urnURN:NBN:no-27668en_US
dc.type.documentForskningsrapporten_US
dc.identifier.duo116679en_US
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/10175/1/mech-02-08.pdf


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