This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...members on the two sides of the truss will be equal. 3. Having determined the stresses due to the different combinations of ...Read MoreThis historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...members on the two sides of the truss will be equal. 3. Having determined the stresses due to the different combinations of loads, the maximum and minimum stresses can be selected as explained in Art. 37. 48. Trussss having a Double System of Web Members. Such a truss may be treated as a combination of two trusses having common chords, but distinct systems of web members. The girder of Fig. 38 A, for example, can be resolved into those shown in Figs. 38 B and 38 C, the stresses in the members of these component trusses being found in the usual manner. The actual stress in any web member of the original truss is given directly by the diagrams while the stress in any chord segment, as ab, is evidently equal to the algebraic sum of the stresses found for cd (Fig. 38 B) and ef (Fig. 38 C). When the given truss can be resolved in more than one way. or when the distribution of loads between the component trusses is uncertain, the problem is indeterminate. Fig. 39 is a crescent roof-truss with two systems of web members, as shown by the full and dotted lines respectively. By tracing out the force polygons for the different joints it will be seen that the stress diagram can be drawn at once for the complete truss. A suitable system of lettering the interior of the truss is given, the intersections of the diagonals being treated as joints. If the joint 1 were made to coincide with 2, the portion of its load supported by each component truss would be Fig. 39. uncertain and the problem in this particular would be indeterminate. 49. Double Diagonal Bracing. In the case of counterbraced panels (see Fig. 33 N, O, P, Q), the two diagonals are assumed not to be in action for the same loading; both being designed for the same kind of stress. When the...Read Less
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