Milford Bridge Collapse
Group 9
Shane Corr
Eamonn Mc Manus
Ian Kavanagh
Jenny Cusack
Introduction
• The bridge was designed to connect the two
towns either side of the river Cleddau
• The bridge was constructed using a box girder
design
• The bridge consisted of seven spans between
77 – 213m in length
• The box girders were deep trapezoidal welded
steel
Why the Bridge Collapsed
• During Construction each box girder was cantilevered
out over the river
• Each section was then welded/bolted to the previous
section
• When the last section for the south side was
cantilevered out the steel diaphragm of the box
failed in compression.
• This caused the lower flange to buckle, bend and fall
to the ground
The Collapse
Consequences of Collapse
• A section of bridge falling to the ground killed
four men working below
• There was an enquiry into the design and
construction of steel box birder bridges
• BS153 – the steel bridge design and
construction code of practice at the time was
considered inadequate
• This led to the publication of a new British
standard BS 5400