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Instructions On Modern American Bridge Building George A. Martin

Instructions On Modern American Bridge Building

George A. Martin

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BRIDGE BUILDING The simplest bridge that can be built, is a single beam, or stick of timber, spanning the opening between the abutments--but this is only of very limited application--(only for spans of 20 feet and less) owing to the rapid increase inMoreBRIDGE BUILDING The simplest bridge that can be built, is a single beam, or stick of timber, spanning the opening between the abutments--but this is only of very limited application--(only for spans of 20 feet and less) owing to the rapid increase in sectional dimensions which is required as the span becomes greater.Next comes the single beam supported by an inclined piece from each abutment meeting each other at the middle point of the under side of the beam--or, another arrangement, of two braces footing securely on the beam and meeting at a point above the middle point of the beam, which is suspended from the apex of the triangle formed by them, by means of an iron rod--These arrangements may be used up to 50 feet. For any span beyond 50 feet, modifications of this arrangement are used which will be described hereafter. Now let us investigate shortly the different strains that the various parts of a bridge have to bear--and the strength of the materials used. The theory of strains in bridge trusses is merely that of the Composition and Resolution of Forces. The various strains, to which the materials of a bridge are subjected--are compression, extension and detrusion.Wood and Iron are the materials more generally employed in bridge construction--and in this pamphlet we shall take the following as the working strength of the materials--per square inch of section. Tension. Compression. Detrusion.Download Instructions On Modern American Bridge Building Now!