A treatise on highway construction . wn) for a single arch. Depth in feet = |/(-17 radius at crown) for an arch of a , Trautwine gives the following rule: For first-class cut stoneof hard material take of the square root of the radius of thecrown; for second-class work, .40 of the square root; and for brickor rubble arches, of the square root. The results by the latterare slightly in excess of those by Professor Eankines formula. 714. Thickness of Abutments.—Numerous rules have been givenfor obtaining the thickness of the abutments for arches. Themost elaborate of these are
A treatise on highway construction . wn) for a single arch. Depth in feet = |/(-17 radius at crown) for an arch of a , Trautwine gives the following rule: For first-class cut stoneof hard material take of the square root of the radius of thecrown; for second-class work, .40 of the square root; and for brickor rubble arches, of the square root. The results by the latterare slightly in excess of those by Professor Eankines formula. 714. Thickness of Abutments.—Numerous rules have been givenfor obtaining the thickness of the abutments for arches. Themost elaborate of these are from their form applied with difiBculty tothe cases commonly occurring in practice, and many of the elementsentering into the solution of the problem are quite indeterminate, de-pending as they do upon the character of the masonry and uponthe workmanship. In place of rules, therefore, we present merelyan empirical table, embracing the results of a considerable degreeiof practice. DRAINAGE—CULVERTS. 54r EXAMPLE OF Fig. ELEVATION. Fa
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