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MR. K. C. DAVEY (Associate-Member): On the basis of the graphs shown in Fig. 10, I have found it interesting to extract some figures and consider them further, to arrive at a relative cost relationship between them as opposed to the purely weight relationship. I append below in tabulated form comparative cost and weight figures for trusses of spans considered by the author at spacings varying between 12 ft. 6 in. and 20 ft. in increments of 2 ft. 6 in. The cost is expressed in the form of equivalent units and for this purpose I have assumed that the relationship between the prices of
individual components of the building is as shown below.
Engineers are rightly cautious in reviewing new techniques of structural design and indeed are sometimes regarded as being too conservative in their acceptance of the results of engineering research. It seems to the writer however that any further progress in the science of steelwork design can be only made on the basis of new assumptions.
In a previous paper' we have pointed out the desirability of being able to calculate the critical load of building frames. This paper shows how the sway critical load of any symmetrical single bay frame may be obtained. It also gives the results of numerical calculations for a particular case and an extension to many bay frames.