So to start im gonna go ahead and assume that the guy im gonna scale things off is the average 177cm tall
His head is 11 px
Usual head to body ratio is 1/7.5
177 / 7.5 = 23.6 cm
23.6 / 11 = 2.145 cm per px
Part of bridge that got destroyed looks like a triangular prism
height = 264 px or 566.28 cm
lenght = 31 px or 66.495 cm
For width i will use a different scan
Girl on the bridge i use for scaling is 148 cm tall and 48 px in the scan
148 / 48 = 3.08 cm per px
bridge width = 10 px or 30.8 cm
Volume of a triangular prism = 0.5 x h x l x w
0.5 × 566.28 × 66.495 × 30.8 = 579883.74 cm3
According to the blog from which our calculation page takes other destruction values i also found that values for fragmenting and violently fragmenting wood (white oak) appears to be 8.34 j/cc and 18.34 j/cc
I personally think this qualifies more for violent fragmentation since we can barely see any fragments but il put 2 ends either way
Low end- 579883.74 x 8.34 = 4836230.392 joules 9-B (0,00116 tons of tnt)
Mid end- 579883.74 x 18.34 = 10635067.79 joules 9-B+ (0,00254 tons of tnt)