The Theory And Practice of Modern Framed Structures. Designed for the Use of Schools, And for Engineers in Professional Practice
The Theory And Practice of Modern Framed Structures. Designed for the Use of Schools, And for Engineers in Professional Practice
Johnson, J. B. (John Butler), 1850-1902
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per foot. Panel load = 74.0 and moment =74(0.6+4.1 -1-10.3) = mo, compared to 1080 by panel concentrations. For stress in dE take the equivalent load for an 80-foot span, as explained in Art. 112. This equals 3470 lbs. The resulting value for dE is 95.2, compared to the exact value of 90.7. For }G use equivalent load for 120- foot span, =3280 lbs. Also load second span with the uniform load of 2500 lbs. per foot. The resulting value is 202.7, compared to the exact value of 199.3. d20 MODERN FRA...MED STRUCTURES. I7S Rlm-bearing Turn-table— Four Supports.— Fig. 228.— The most common method of swing-bridge construction provides two supports at the centre* thus dividing the truss into three spans. The bracing of the short central span is usually arranged as in Fig, 228. It is thus capable of resisting shear, and the continuity of the truss is complete. With some writers it has been customary to apply to this form of truss the formulae for a ^^^- '28. continuous beam of four supports— formulae based on the assumption of uniform moment of inertia and on a neglect of deflection due to shearing stresses.
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