- 29,374
- Glasgow
- GTP_Mars
I had read that some witnesses had said a lightning bolt had struck the bridge but I wasn't aware that it could have been the primary cause of the collapse...Some work was going on in the foundations, I'm told. A friend who's a structural engineer saw the video of the moment of the strike and believes, given what she's read, that over time the concrete may have been shifting enough for small porous cavities to form around the pillar's internal steel reinforcements within thereby allowing moisture to gather. The lighting (a significant bolt) could have shattered internal sections (explosive steam exapnsion) if the structure wasn't in altogether good repair.
She believes this is a potential problem for many 60s/70s shutter-built structures. The chances of the 'perfect storm' of problems occuring are very low but the effects can be catastrophic.
Meanwhile, it emerged that the governing 5-Star Movement once described 'the imminent collapse of Ponte Morandi' as a "fairy tale" - the article has been deleted from their website, but it is still visible thanks to the Wayback Machine archives... oops.
https://web.archive.org/web/2018081...del-coordinamento-dei-comitati-no-gronda.html