The forensic engineering investigation after the collapse of the Mianus River Bridge on 27 June 1983 brought together several experts. They all focused their attention on the hanger assemblies. As is not unusual, each emphasised different root causes and they all reached different conclusions. What modification was made to the bridge ten years before the collapse, and how did this modification adversely affect the durability of the pin and hanger assemblies (F)? 4

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