Howe Truss Bridge
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William Howe patented a wood and
iron rod truss in 1840 and extended the patent with improvements in
1850. The truss was the first to be designed using mathematical
stress analysis. The Howe truss, suitable for heavy duty bridge
spans, was adopted by the railroad industry and became one of the
most widely used trusses for railroad bridges. The truss consists of wooden upper and lower chords, the chords linked together with sets of dual iron rods and wooden braces and counter braces. The braces and counter braces are butted against the chords on angle blocks. The rods are adjusted with nuts.
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