Pin and hanger failures from pack rust were associated with which bridge?

Pin and hanger failures from pack rust were associated with which bridge?

• A. Silver Bridge
• B. Mianus River Bridge
• C. Daniel W. Hoan Bridge
• D. Eye Bolt Failure

Answer: (B)

Pin-and-hanger connections in older pin-connected truss spans can fail when corrosion forms packing around the pin in the hanger pockets, reducing the load-carrying capacity and accelerating fatigue. This failure mode is most closely associated with the Mianus River Bridge, where corrosion and packing around the hanger pin contributed to the deterioration of the connection and a subsequent failure. In contrast, the Silver Bridge failed due to a fractured eyebar, not a rusted pin-and-hanger; the other options refer to different failure modes or structures.

Pin-and-hanger connections in older pin-connected truss spans can fail when corrosion forms packing around the pin in the hanger pockets, reducing the load-carrying capacity and accelerating fatigue. This failure mode is most closely associated with the Mianus River Bridge, where corrosion and packing around the hanger pin contributed to the deterioration of the connection and a subsequent failure. In contrast, the Silver Bridge failed due to a fractured eyebar, not a rusted pin-and-hanger; the other options refer to different failure modes or structures.