$this->bbcode_second_pass_quote('Newfie', 'A')h ha, I was able to view that video. Thanks for posting.
A couple of observations:
That’s not a real big crane
The Workman (poor soul) appeared to be leaning over the anchor point. I doubt he would be leaning over that point while strain was applied. Very bad practice.
When the structure breaks I don’t see the crane jerk back or otherwise move. So I don’t think there was any stress on the crane at that instant.
PeakOil is You
Florida pedestrian bridge collapse
Re: Florida pedestrian bridge collapse
by vtsnowedin » Sun 18 Mar 2018, 09:05:20
I slowed it down to 0.25 speed (settings nob lower right). It looks like the roof between the anchor point they are working on and the left end snaps first.
Your right about the crane not moving. Perhaps it was being used to set a generator and hydraulic pump up on the roof to feed cable jacks. Those jacks are circular and about a foot high and a foot in diameter. The cable feeds through the center and a grip chuck grabs the cable. Travel of the piston is only about eight inches but they can pull 200 tons or better depending on model. The pump and gauges are built into a frame and will fit in the back of a pickup. I see one pickup parked in front of the cranes front right outrigger.
Tough watching the workmen fall. No words serve.
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Re: Florida pedestrian bridge collapse
by Newfie » Sun 18 Mar 2018, 19:45:48
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Re: Florida pedestrian bridge collapse
by Newfie » Sun 18 Mar 2018, 20:59:24
FDOT trying to apply some Teflon. I find it odd that FDOT would not require some guarantee or an in-house review of a structure that goes over their ROW. Especially something as innovative and massive as this. If for no other reason than to assure the clearance envelope is maintained.
Question: knowing how often bridges are hit by over height vehicles is their any design calculation for this event?
http://www.fdot.gov/info/CO/news/newsre ... LLAPSE.pdf
Question: knowing how often bridges are hit by over height vehicles is their any design calculation for this event?
http://www.fdot.gov/info/CO/news/newsre ... LLAPSE.pdf
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Re: Florida pedestrian bridge collapse
by vtsnowedin » Mon 19 Mar 2018, 03:09:30
$this->bbcode_second_pass_quote('Newfie', '
')
Question: knowing how often bridges are hit by over height vehicles is their any design calculation for this event?
I'm sure there is but was above my pay grade. ')
Question: knowing how often bridges are hit by over height vehicles is their any design calculation for this event?
One of the bridges I worked on a few years ago just took a hit this month. Dump truck hauling snow from a mall parking lot forgot to put the body down and the cab shield struck the bottom cord of a concrete per-stressed beam. Truck took it hard and it chipped concrete off down to the rebar. One beam out of ten so even if it had compromised the beam the poured in place concrete deck would have held it all together.
Back in the 1970's they figured out (the hard way I believe) that a steel truss bridge that took a direct truck hit on one of its end posts would fall down so we went around beefing up the guardrails on the approaches so a crashing truck would slide on by and onto the bridge. Then you had to worry about the truck or it's load burning and melting the bridge down.
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Re: Florida pedestrian bridge collapse
by Outcast_Searcher » Mon 19 Mar 2018, 13:08:59
$this->bbcode_second_pass_quote('Newfie', '
')Then you had to worry about the truck or it's load burning and melting the bridge down.
')Then you had to worry about the truck or it's load burning and melting the bridge down.
I had a friend with a pretty interesting government job, which could be really sweet if you like to travel.
He mainly kept a pager and had an easy job with few hours 90%+ of the time. Occasionally there would be some nasty truck or train wreck involving dangerous chemicals or worrying mixes of things. Then he'd fly in and supervise the initial cleanup, especially remediation of the hazardous materials to prevent dangerous explosions, fires, fumes, puddles, etc.
(This was before cell phones, even the giant ones, so I don't know details about communications during the delay of flying in. Presumably some local official supervised some basic containment decisions until he'd arrive.)
He's said if you had a good degree in chemistry and the ability to be calm and appear confident in such a situation, it was a terrific job. He was apparently well paid too, based on his lifestyle.
Given the track record of the perma-doomer blogs, I wouldn't bet a fast crash doomer's money on their predictions.
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Re: Florida pedestrian bridge collapse
by vtsnowedin » Mon 19 Mar 2018, 14:07:47
$this->bbcode_second_pass_quote('Outcast_Searcher', '')$this->bbcode_second_pass_quote('Newfie', '
')Then you had to worry about the truck or it's load burning and melting the bridge down.
')Then you had to worry about the truck or it's load burning and melting the bridge down.
I had a friend with a pretty interesting government job, which could be really sweet if you like to travel.
He mainly kept a pager and had an easy job with few hours 90%+ of the time. Occasionally there would be some nasty truck or train wreck involving dangerous chemicals or worrying mixes of things. Then he'd fly in and supervise the initial cleanup, especially remediation of the hazardous materials to prevent dangerous explosions, fires, fumes, puddles, etc.
(This was before cell phones, even the giant ones, so I don't know details about communications during the delay of flying in. Presumably some local official supervised some basic containment decisions until he'd arrive.)
He's said if you had a good degree in chemistry and the ability to be calm and appear confident in such a situation, it was a terrific job. He was apparently well paid too, based on his lifestyle.
The job falls to the highest ranking fireman on the scene. They use the numbers on the truck placard to pull the correct page from the response book that is in every fire truck. Then to pass it on to the chief when he shows up and he will call in experts as needed. One rule is if the driver of the truck runs past you take the book and follow him at speed until he stops and read about it there.
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Consulting in a emergency would make that retirement so much better.
We might have some useful input but I at least don't have enough letters after my name, BS, MS, PHD etc.to be listened to by anybody that counts. 