Looking at that
photo above, it seems that the linkage attaching the
ramp to the building has failed, not sure if it was the cause of the failure or came as a result of the failure, but this the point where the
ramp swivels up and down to accommodate the tide, which is around 10' at that location. So a lot of movement possible here, on a daily basis. That connection is simply an
aluminum pipe running thru' several alternating
aluminum sleeves and it is conceivable that some wear and tear may occur there.
I also note a third handrail running down the middle of the ramp. Again, not sure if this is a structural feature or a convenience feature.
The ramp may also have additional support underneath it, which is not visible.
The handrails can be considered as a structural truss which supports the actual ramp.
Many questions here. While the ramp had many people on it, there is no mention if they were carrying anything heavy, etc, which could have also contributed to the failure.
Time will tell I guess as the investigation unfolds.