Author: Carpmael, Raymond
First published: N/A
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SIR,-with reference to the letter published in your September issue over the signature
“De Pontibus,” the total bending moment allowed for in each of the beams in question was 3,813,000 lbs. inches, giving an average stress in the tensile steel of about 15,000 lbs. per square inch. About 55 per cent. of this moment is in respect of the superimposed live load. I agree with your correspondent that the dead load alone would stress the rolled steel joists to approximately 10 tons per square inch and that the addition of the live load to this would reduce the factor of safety to approximately 2.
19. The various methods of solving frameworks, in which both the degree of mechanical
redundancy and the number of independent angular and transverse displacements are small, have been discussed in detail, and it has been shown that there is very little difference in the application of either moment-energy or deformation-energy methods where algebraic solutions are required, and that where arithmetical solutions are sufficient there is a third method available in moment-distribution. The application of special methods such as slope-deflection equations and three- or four-moment equations leads to the same results but by longer processes.
THIS Final Report continues and completes the story of the illuminating and exhaustive investigations into the behaviour of steel structures on which the Research Committee have been occupied for over six years.