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Mr E. W. Bunn (F) (GLC): I am convinced that a great many of us-certainly those approaching my age-have lived without CP 114 for a long while. Certainly, before 1948 we had to live without CP 114 because it did not even exist. In those days, most of us had a ‘little black book’ with all our notes from college, evening classes, office practice and so forth, with pull-out charts and tables with moment factors, lever-arm
factors and all the rest of the design aids.
The current position concerning analysis of fastener groups subject to eccentric shear loading is reviewed briefly. Present application of the rigid plate-plastic fastener model is inhibited by the lack of a convenient general solution. A new approach is presented which, by suitable choice of parameters for loading and eccentricity, enables the full practical range of fastener groups to be analysed with minimal tabulation. Accuracy in analysis and effectiveness in design are tested by typical applications. An accuracy within ± 2% may be generally expected from the tables. The choice of parameters accords well with the natural sequence of decisions when designing this class of joint.
J.O. Surtees, C.P. Gildersleeve and C.J. Watts
Limit state design
Mr M. J. Fothergill writes: Mr Skinner, in the February 1981 issue, raised the topic of limit state design once more, and made a very important point which I felt could have been developed more strongly, instead of diverting into a discussion of the relative merits of CP 114 and CP 110.