Iron Truss Bridges for Railroads: Methods of Calculating Strains, with a Comparison of the Most Prominent Truss Bridges, and New Formulas for Bridge Computations
D. Van Nostrand, 1870 - 130 páginas
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abutment acting amount angle assume becomes Bottom Chord braces breaking weight bridge calculating carried cast-iron cloth coefficient combination coming component compression connecting constant Construction Counter-strut Counter-tie curve Depth determined developed diameter differential Direct Compressions discussion economy ends engine entire equal equation evidently examined experiments extra strains feet Figure Flat flat-end forces formula give given goes greater greatest half head Hence Hodgkinson's horizontal horizontal forces Illustrated inches inclined increase iron joints keep length less material Maxima Direct maximum method middle Multiply necessary neutralize obtain once original panel Panel length pillars points portion posts prevent proper proportion resist resolved rising Round round-end segments Short similar span strength struts Substituting sustain tension ties Top Chord transmission transmitted truss vertical volume whence wrought-iron
Página 62 - The strains on the ties are equal to the portions of the weight that travels by each, multiplied by the secant of the angle of inclination with the vertical.
Página 126 - ... where n = 2, in very long pillars ; but in shorter ones the value of n will be reduced to any degree, or so that n = o, or that ?* = a constant, in very short columns ; showing the weakness of wrought-iron to sustain compression, and its unsuitableness for pillars.