https://www.bbc.com/news/world-latin-america-56985164 Please Register or Log in to view the hidden image! Please Register or Log in to view the hidden image! Please Register or Log in to view the hidden image! looks interesting i am guessing it is vibration from the joins combined with local industry & traffic vibration combined with rail car & bridge vibration just shaking the bridge to pieces
lack of suspension(shock absorbers) lack of flexibility lack of vibration monitoring im guessing it has all those factors involved already i also guess it could be something as simple as an underground subsidence but im looking at it and it is where the 2 tracks merge which means it would have considerably more vibration & so require a lot more advanced strengthening and shock absorption as ALL other factors would just increase vibration.
All what you mentioned adding up to lack of maintenance Recently saw a American bridge due for replacement years ago according to each politician at election time After election - it can wait a bit longer. Bit longer it might look like Mexico bridge Any idea if Mexico bridge had in-built stress recorders? Please Register or Log in to view the hidden image!
exactly what i was wondering specially considering it sitting right beside continental plates AND sitting below sea level on a flooding massive lake bed its like daring mother nature to have a go i will have a look back at earth quakes maybe tomorrow(if i recall) i doubt mexico has monitoring the south american exodus from covid & economic collapse will be punishing Mexico no one will be wanting to spend any money in the country and instead take as much as they can and then move north to the usa or extract every last dollar anyone has and not spend any of that on the local systems American capitalists look at Mexico and define Mexico as being the abuser who is about to cost them money so they use that ideology to refuse to invest or provide AID while Mexican low cost labor supports and keeps up the entire usa ecconomy
just looking at 1 picture you can see the massively wide double rail coming into a single rail there is almost no real support so its going to be a MASSIVE stress zone of torque Please Register or Log in to view the hidden image!
i am guessing vibration from the train & from the track & from the environment conflicting at the ground point where road traffic & surrounding frequency comes through to a point of harmonic amplification + or - most likely is materials faults at moving parts or weak points in pour(concrete etc) i wonder how strict & expensive their concrete materials are as steel is increased to compensate for lower grad concrete, it will have an amplification process of harmonic resonance through the structure increasing weakness to various points assuming the weak concrete is not getting increased vibration making if fail even faster given the massively high volume of people probably nothing less than world standard top quality modern engineering would stay up for long built from the ground up including isolation & absorption with monitoring even so we see modern high tech expensive builds being stopped and re built or pulled down ad re formed often not withstanding any potential corruption concepts that may or may not exist involving short cuts and cheap materials and under budget targeting resulting in over all poorer builds etc maintenance issues. my 1st thought was terrorism but it appears not significant enough and the connection point and build looks like its most likely a result of over use expired build materials and expired design etc if they factor the increased traffic i wonder how the maintenance looks they need light rail electric whos going to pay for it ? usa agriculture sector would be a good start maybe some Californian tourism budgeting all together with Mexican money assuming they can build a defense against covid. i love mexican food & some aspects of their culture and the very few Mexicans i have met were very nice. they have such a lot of culture to offer the world and have been so ergonomically oppressed for soo long USA labour supply pool company(mexico) should have earnt quite a bit of money by now but they get trampled by the rest of south America and USA litigation toward the wall pushing back increasing costs wasting massive resourcing on policing a wall that doesn't really work that whole American bigger guns kinda attitude doesn't save money it costs money and Mexican infrastructure is soo terribly poor(lacking big tax incomes for proper funding)
Yes. And, this being Mexico, I would be far from surprised if corruption turns out to be at the bottom of it.
thats a specialized answer depending on the type of build and what requires reinforcement. Please Register or Log in to view the hidden image! Please Register or Log in to view the hidden image! total guess over loading on a design made for very light use you can see a massive difference in the pillars and the thin section of steel truss primary fabrication struts using half the thickness dividing it when it probably should be double the thickness instead th increased flexibility of the thin pillars may have increased the movement stress on that section between the thin pillar and thick pillar additionally if trains are braking on that part it may be placing massive additional strain and moving the entire foundations creating sheer strain on all steel bolts along with increased vibration it would only take a small fault with the steel and/or the ground moving beneath one of the pillars or several of the pillars with the massive weight of trains sitting stopping and starting at the station it could have pulled the entire section of bridge away slightly over time in the last picture above above the lady standing you can se the steel is formed and split to half the width thats is a design fault of engineering and or a point that would have likely taken the weight and collapsed 1st as a guess from a simple glance
In my wife's nation Ecuador most of the buildings in cities and towns are built to withstand earthquakes so I am guessing that that structure was not up to code.
And now this Traffic on and below a major bridge over the Mississippi River near Memphis could be halted for several days or longer, causing significant disruptions to motorists and shipping, officials said on Wednesday. Please Register or Log in to view the hidden image! https://www.npr.org/2021/05/12/9964...s-indefinitely-closed-disrupting-supply-chain Caught this one Please Register or Log in to view the hidden image!
The Mexico bridge appears to be prestressed concrete which failed in the middle at the highest area of bending stress. Likely a design or construction error, no way to determine from photos shown. Not likely overload.
After 9/11 everyone was an architect. After Malaysian Airlines flight 370 everyone was a pilot. After COVID-19 arrived everyone was an epidemiologist. Now everyone is a civil engineer. Such is the usual pattern online.
The inspector (Monty Frazier) who failed to find the crack in 2 consecutive years has been fired and may be facing federal prosecution. With people like him looking after our infrastructure...................................................... (do you feel safe?) and the crack was obvious in a photo taken in 2016 see https://www.commercialappeal.com/st...ando-de-soto-bridge-began-earlier/5163249001/
what i am guessing is the design & build would be for a lot less traffic than it has gotten aside from any design or material faults i expect increased traffic would exponentially increase faults what i am wondering is if this factor can be shown in mathematics to show a real useful benefit to learn from if they can see a real statistic then they can manage by general people counting computers so it has a system which shows its real load bearing