Deflections of horizontal structural members

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Series titleCanadian Building Digest; no. 54
Physical description5 p.
Subjectbeams; spandrels; slabs (members); deflection; strain
AbstractDeflections in horizontal flexural members do occur and are influenced by several mechanisms, some of which have cumulative effect. With the contemporary practice of using higher working stresses and more slender members, deflections are greater than those that occurred with past construction methods. With finishing and cladding materials being installed to close tolerances, excessive deflections cannot be tolerated unless they are adequately predicted and allowed for. In many cases it may be necessary to redesign structural spanning members to reduce the total ultimate deflection to suit associated finishes, partitions and walls. These points all indicate that deflections due to elastic strain, creep, shrinkage, temperature and moisture changes, load characteristics and form of structure must be considered, especially when the design deviates from practices that have proved satisfactory.
PublisherDivision of Building Research. National Research Council Canada
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAussi disponible en français : Fléchissements affectant les pièces de charpente horizontales
Peer reviewedNo
NRC number925
NPARC number20325121
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Record identifierfe15c9a0-10f8-45bf-8cdc-bc2d04e4dac8
Record created2012-07-18
Record modified2016-05-09
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