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Trust Design Bridge-Pratt

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Written by:

Betty H


Date added:

February 26, 2014








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2 / 371


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The Pratt type successfully survived the transition to iron constructions well as the second transition to steel usage. The Pratt truss inspired a large number of variations and modified subtypes during the nineteenth and early twentieth centuries They are a lot of major subtypes of the Pratt design...
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Like the Double Intersection Pratt Trust. This subtype was patented in 1847 by Squire Whipple and modified in1863 through addition of crossed diagonals by Lehigh Valley Railroad chief Engineer John W. Murphy. Also there's the Pratt Half-Hip subtype was developed during the latter part of the nineteenth century...
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