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John Townshend

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  • Comment on: Six dead as 862t bridge collapses onto Florida highway

    John Townshend's comment 17 March, 2018 10:51 pm

    Looks like a sequencing problem, and mismatch between designer's intentions and construction procedure. The span as installed was carried at third points on trestles on transporter (primarily hoggng), then changed to a full span (sagging), then future intention to support by an array of cables (fairly neutral in terms of hoging or sagging). Reports of cable tensioning works at time of incident imply adjustment to pretensioning of prestressed concrete bottom and/or top slab. A highly sophisticated load-transfer procedure which went horribly wrong.