it caused damage , to the bridge as it collapsed three section of it . but there is distance between two bridge and power of explosion is diminished by power of 3 . if you are 1 meter from the bridge you receive 27 time more energy than you are 30m away at 40m you receive 64 time less energy .
do you recall when usa tried to sink USS Independence (CVL-22) in operation crossroad with a nuke and they failed, the bomb was detonated half a mile away , again they detonated another bomb 7 day later and again they failed to sink it the first one was a free fall 23kt bomb and the second one was another 23 kt bomb but this time detonated underwater
the circle is 914m and number 28 is independent the 5 black ship sank , the orange ship was the ship that supposed to get bombed but air force made a 700m mistake in targeting
you think what would have happened if they detonated it 100m away
and in the case of the bridge , i say what i see , the other line of the car bridge stayed in place , why you think the railroad bridge get severely damaged while it was farther away and there is no sign of serious damage on it ? about the explosion you saw on camera , it actually look bigger than it was as it was dark then a big light , guess what the camerra would do to compensate for difference in the light intensity, traffic cameras do nothing , they become blind