Create 3d models, diagrams and animations detailing the nature and extent of defects in the lift span deck installed on the Morrison Bridge in 2001-12.
This series of cutaway diagrams show the fiber-reinforced polymer (FRP) deck installed over the existing steel bridge beams & stringers (click to advance diagram):
Improperly installed fasteners were one of many issues flagged by County inspectors. This series compares the fastener layout shown in design documents with the conditions actually observed on the bridge. Viewing the panels from below makes it clear why the misaligned screws are a problem.
One of the most difficult issues to grasp was how the engineering design contributed to the bridge deck failure. This animation was prepared as demonstrative evidence for use by the County’s structural engineering expert: