Moderators: richierich, ua900, PanAm_DC10, hOMSaR
readytotaxi wrote:Yes, looks like something out of a Indiana Jones movie, perhaps to many got together in one place.
Avatar2go wrote:It appears that the company Oreva had managed the bridge for many years, and had threatened to do only temporary repairs before opening the bridge, unless the government signed a long-term contract. Which they finally did in March 2022.
At the bridge opening 7 months later, the executives claimed that repairs had been full and final, but that is now open to question.
The preliminary analysis is that the bridge failed at the cable connectors to the deck, and that the failure was aggravated by overloading and rocking the bridge from side to side.
There will need to be an engineering analysis to determine what repairs were done, and if they were sufficient.
https://www.deccanherald.com/national/w ... 58419.html
Avatar2go wrote:Just a speculation on the apparent cause of the collapse, without any data. The claim of resonance, as a comparison to Tacoma Narrows, is an incorrect understanding.
Rather what I have read, from engineers who have reviewed the video, is that the connectors to the bridge deck gave way, allowing the deck to drop away. Contributing factors may have been overloading, as well as people swinging the bridge from side to side. There may have been mechanical or deterioration problems in the connectors as well. That part is uncertain, although the claims that rusted components were painted and not replaced, is very telling. But those mechanisms are not the same as resonance.
For Tacoma Narrows, resonance was still involved, but the driver now is understood to be aerodynamic flutter. Flutter requires the presence of a natural frequency, and resonance, but resonance alone is not the driver or the cause.
Avatar2go wrote:Here is the video I saw. It shows a person trying to swing the bridge at the moment of failure. Also shows the cables dangling after the deck seperated at the connectors. But also shows some of the cables failing from above as well.
It's difficult to know for sure without an engineering analysis.
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