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Headline

Six dead as 862t bridge collapses onto Florida highway

Comment

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.

Posted date

17 March, 2018

Posted time

10:51 pm

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