Excerpt from Strength and Calculation of Dimensions of Iron and Steel Constructions: With Reference to the Latest Experiments
Many experiments have been lately made in Germany, England, Sweden, and America, to determine the properties of iron and steel. We propose to give in this brochure a general view of the results obtained, and of their consequences, without much detail, but so complete as to place practical engineers at the present stand-point of critical judgment.
These experiments show (what every one admits) that the methods hitherto employed in calculating the dimensions of iron and steel constructions have been entirely wrong; and that the security of structures, in which their results have been applied, though with great expenditure of material, is much less than supposed.
Several methods for attaining better results have been projected; one of which was adopted by the Bavarian Government. The brief sketch of the several methods, given in the Appendix, shows that Launhardt's deserves the preference. This is so obvious, and meets with so few objections, that it is unsatisfactory only because of its limited application. A formula like that of Launhardt was needed for the case of resistance to alternating tenison and compression. Such a formula is here deduced. With it we have all the requisites for a simple and rational determination of dimensions. It is to be hoped that no one will wait to consider it until more bridges are destroyed.
The chief reason that no one of the new methods has been generally employed is, that no one of them is complete.
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