BRIDGES AND
TUNNELS OF
ALLEGHENY COUNTY,
PENNSYLVANIA
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Article Index
HAER
Smithfield Street Bridge, Pittsburgh, PA
01 Cover Page
02 Foreword
03 Ferries
05 Monongahela
Bridge and
Fire
12 Masonry
17 Removal
of Old and
Erection of
New Bridge
18 Flooring
19 Ornamental
Towers and
Painting
22 Alterations
23 Footnotes
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Smithfield Street Bridge, Pittsburgh, PA Historic American Engineering Record PA-2 page 8
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Table of Quantities (Suspension Bridge) Length of bridge between abutments . . . 1500 feet Number of spans . . . 8 Average width of spans from centre to centre . . . 188 feet Diameter of cables . . . 4-1/2 inches Number of wires in each . . . 750 Weight of superstructure of one span, as far as supported by cables . . . 70 tons Tension of cables resulting from it . . . 122 tons Weight of four six horse teams, loaded with 104 bushels of coal each . . . 28 tons Tension resulting from it when at rest . . . 48 tons Weight of 100 head of cattle at 800 lbs . . . 40 tons Tension resulting from it when at rest . . . 70 tons Aggregate weight of one span as far as supported by the cables, plus 100 cattle at rest . . . 110 tons Tension resulting from it . . . 192 tons Ultimate strength of two cables . . . 860 tons Section of anchor chains . . . 26 inches Section of pendulums . . . 63 inches
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Introduction Last modified on
30-Sep-99
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