Bumper to bumper traffic due to construction maximized the amount of traffic vehicles (weight) on the bridge.
Never ever had bumper to bumper traffic before? Weren't lanes closed, reducing the weight?
Construction crews and their personal vehicles added more weight.
Yeah, those fat contractors...
They were poring concrete and had numerous large concrete trucks (overly heavy loads concentrated in small areas).
Didn't see one concrete truck in any of the photos or videos.
They had many smaller liquid concrete vehicles moving and pouring concrete (bobcat size).
Those fat contractors driving Bobcats.
During this period, a train was passing by underneath, which caused a flexing (depression) of the ground support for the bridge, causing the girders to drop and flex.
Don't know if the train was passing below at the time, but the tracks are not below the steel span. The tracks are below the concrete structure portion. See here
This bridge has no center piers buried in the river bed like many others. It was supported only by the ends, and they couldn’t take all those forces at once.
Yeah, right. They designed the bridge with center spans but forgot to install them.
Thak you for your critique of my theory.
One lane was closed.
Has the bridge ever had bumper to bumper traffic? Yes.
Has it had it when one lane has had the concrete ground away and new concrete is being poured by numerous concrete trucks, concentrating heavier than normal loads on it? Not that I know of.
There were concrete trucks, one of them was halfway in the river at a key point of the collapse.
Sorry the news folks aren’t showing this to you right now, probably because it’s DARK right now.
The ‘concrete structure portion’ landed on top of the train. Ya think maybe it could have failed ???? Shifted???? Added to the combined factors to produce this disaster.
As for center piers, look at the bridge next to it, and look at pictures of this one before the collapse.
SEE ANY PIER IN MIDSTREAM????
I anxiously await your informed response.
