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At the meeting a number of members contributed to a discussion on Dr. Plowman's paper and their comments were recorded by the Institution's shorthand writer, Mr. A. R. Purchase, whose death was announced a day or two later. Despite many efforts it has proved impossible to transcribe Mr. Purchase's notes. The written contributions to the discussion are published below, with Dr. Plowman's replies. The Institution offers its apologies to Dr. Plowman and to those members who spoke at the meeting for the fact that publication of the full discussion is impossible.
This paper presents an extension of the Cross method of moment distribution to the analysis of continuous frames with members having hinges located between supports. General expressions for the stiffness, carry-over factor and fixed-end moments are derived for members with variable moment of inertia. Numerical examples are given to illustrate the procedure of analysis.
S.L. Lee, R.S. Harwell and F.P. Wiesinger
The virtual work equation by which flexural deformations are related has been corrected to allow for the effect of axial compressive forces. These corrections can be applied wherever the end moments on an axially loaded member are defined and are particularly useful in the determination of the elastic critical loads of structural
systems by reiterative numerical methods.