AARoads Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

New rules for political content in signatures and user profiles. See this thread for details.

Author Topic: Miami bridge collapse  (Read 985 times)

Alps

  • Everybody Obeys the Octagon
  • *
  • *
  • Offline Offline

  • Posts: 11825
  • Views expressed are my own, not my employer's.

  • Age: 35
  • Location: New Jersey
  • Last Login: Today at 12:10:39 AM
    • Alps' Roads
Miami bridge collapse
« on: March 15, 2018, 05:38:23 PM »

http://www.miamiherald.com/news/local/community/miami-dade/west-miami-dade/article205316174.html


This was supposed to be a two span cable stayed bridge. One span was erected and left in place without cable supports or the second, counterbalancing span. Now it collapsed. I'm no structural engineer, but I'm not surprised that the pier collapsed with loading completely different than it was designed for. Any other thoughts?

Duke87

  • *
  • Offline Offline

  • Posts: 5006
  • Age: 30
  • Location: Queens, NY
  • Last Login: September 17, 2018, 11:46:45 PM
Re: Miami bridge collapse
« Reply #1 on: March 15, 2018, 11:48:29 PM »

Reminds me of an oft-repeated line from a crotchety old engineering professor where I went to school who refused to ever give partial credit on any homework or exam questions.

"You build bridge, bridge fall down, no partial credit!"
Logged
If you always take the same road, you will never see anything new.

bing101

  • *
  • Offline Offline

  • Posts: 2043
  • Last Login: September 17, 2018, 04:33:06 PM
Re: Miami bridge collapse
« Reply #2 on: March 16, 2018, 12:00:03 PM »

Logged

bing101

  • *
  • Offline Offline

  • Posts: 2043
  • Last Login: September 17, 2018, 04:33:06 PM
Logged

DJStephens

  • *
  • Offline Offline

  • Posts: 417
  • Age: 43
  • Location: Dona Ana NM/Tucson AZ
  • Last Login: September 08, 2018, 03:49:26 PM
Re: Miami bridge collapse
« Reply #4 on: March 24, 2018, 11:12:35 PM »

Some reports stated a "stress" test was being conducted on the structure when it failed.  Perhaps that was post-tensioning?  One has to wonder the wisdom of conducting such as test on the structure over live traffic.   Did work on a project that involved post-tensioning, but it was a segmental design, with all segments in place between piers.   Likely some BSCE's here can more accurately comment, did take determinate and indeterminate structural design, but did not finish the degree, and found indeterminate to be a bear.   
Logged

roadman

  • *
  • Offline Offline

  • Posts: 3399
  • Age: 57
  • Location: Boston, MA
  • Last Login: Today at 12:53:25 PM
Re: Miami bridge collapse
« Reply #5 on: May 23, 2018, 12:09:50 PM »

Logged
"And ninety-five is the route you were on.  It was not the speed limit sign."  - Jim Croce (from Speedball Tucker)

"My life has been a tapestry
Of years of roads and highway signs" (with apologies to Carole King and Tom Rush)

J N Winkler

  • *
  • Offline Offline

  • Posts: 5884
  • Location: Wichita, Kansas/Oxford, Great Britain
  • Last Login: Today at 10:31:14 AM
Re: Miami bridge collapse
« Reply #6 on: May 23, 2018, 01:05:04 PM »

"All aspects of the collapse remain under investigation":  this sounds to me like green-eyeshade study of the plans and erection procedure has turned up no obvious design errors or a priori reasons to expect the collapse to occur.
Logged
"It is necessary to spend a hundred lire now to save a thousand lire later."--Piero Puricelli, explaining the need for a first-class road system to Benito Mussolini

roadman65

  • *
  • Offline Offline

  • Posts: 8565
  • Location: Orlando, fl
  • Last Login: September 15, 2018, 01:15:55 AM
Re: Miami bridge collapse
« Reply #7 on: July 19, 2018, 11:56:58 PM »

Lets hope the same mistake is not made in Orlando.  A pedestrian overpass was just built on US 17 & 92 and SR 50 east of I-4 last weekend.  Its not open yet but motorists on Colonial Drive have to pass beneath it.
Logged
Every day is a winding road, you just got to get used to it.

Sheryl Crowe

 


Opinions expressed here on belong solely to the poster and do not represent or reflect the opinions or beliefs of AARoads, its creators and/or associates.