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Title: Column design for axial compression and end rotation
Author: King, Charles MacIan
ISNI:       0000 0004 2708 4726
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2011
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A column design method has been developed for use in braced frames with discontinuous columns using flexible cap and base plates and floor beams that are either simply supported or continuous. The method is intended to be used with shallow floor construction with concrete or steel/concrete composite slabs in which the floor slab occupies the depth of the floor beams and is fully grouted to the beams so that the slab restrains the full depth of the beams and was developed to simplify the design of discontinuous columns in frames using Corus ASB type floor construction without resorting to methods using nominal moments. Floor beams are therefore designed to carry the floor loads without interaction with the columns. Columns are designed to resist the floor beam reactions with column end-rotations equal to the slope of the floor beams at the top or bottom of the column, whichever is the greater. The method incorporates the elasto-plastic behaviour of columns subject to axial compression and large end-rotations. The design procedure uses rectangular stress blocks of classic plastic cross-sectional resistance and includes the end-rotations of the columns and the effects of imperfections. Therefore the approach is similar to classic second-order rigidplastic analysis but with the important additions of actual end-rotations and an initial imperfection. The method has been verified by physical tests on full-scale columns and finite element analysis using non-linear geometry and material properties. The design method 1. is derived from simple geometry and simple statics 2. accounts for initial imperfections by deriving a design value from the strut resistance of whatever design code is specified 3. is limited to sections that cannot be affected by torsional, lateral torsional or torsional flexural buckling 4. is not applicable to sections with thin walls 5. has been verified for use with hot-finished square hollow sections by testing fullscale columns The design method is defined in detail and illustrated by a worked example so that it can be used in normal design practice. Connection design and bracing requirements are discussed to enable the column design to be used to design complete frames.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available