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The design of haunched composite beam frames for buildings

Rackham, J. W. (1992). The design of haunched composite beam frames for buildings. (Unpublished Doctoral thesis, City, University of London)


This thesis examines the design and overall behaviour of haunched composite beam frames braced against sidesway. It has been compiled as a result of both a theoretical and an experimental study.

A detailed design method is presented, which incorporates options for plastic or elasto-plastic analysis at the Ultimate Limit State. A method for checking the susceptibility to lateral instability in the hogging regions of composite beams is also presented, and it has been developed by using elastic energy theory. The design method is intended to be applied in conjunction with the British Standard for the design of steel-framed building structures, BS5950 Parts 1 and 3, although the engineering principles involved could be used with other countries’ codes. A detailed design example is also included to demonstrate the application of the method. A review of other relevant experimental and theoretical work has also been undertaken and is critically appraised where appropriate.

The experimental programme carried out as part of this work involved two full-scale tests, and these are described. Particular attention was given to the stiffening details at the shallow end of the haunches, and several options were tested. The most successful proved to be that where full-depth web stiffeners were fitted at this position. Analyses of the tests are included and they show that the theoretical predictions are generally slightly conservative.

A finite element model of the hogging region of a haunched composite beam was also developed, and this was applied to one of the tests. The results of this are presented. It is intended that this particular work will enable further computer simulations to be carried out.

To enable early dissemination of the ideas developed in this thesis, during the course of this work an interim design guide, written jointly by this author and his industrial supervisor, Dr R M Lawson, was published by the Steel Construction Institute.

Publication Type: Thesis (Doctoral)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Science & Technology > Engineering > Civil Engineering
School of Science & Technology > School of Science & Technology Doctoral Theses
Doctoral Theses
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