Building and Construction

NTSB Offers Update on Bridge Collapse Probe

10 August 2018

(Click to enlarge.) This photo illustrates the condition of the cracks after the move of the main span that occurred on March 10, 2018. Photo taken on March 14, 2018 at 1:50 p.m. shows east side directly adjacent to vertical member 12, top of deck looking down, view of crack. Labels added to photo by the NTSB. Source: Bolton, Perez & Associates Consulting Engineers(Click to enlarge.) This photo illustrates the condition of the cracks after the move of the main span that occurred on March 10, 2018. Photo taken on March 14, 2018 at 1:50 p.m. shows east side directly adjacent to vertical member 12, top of deck looking down, view of crack. Labels added to photo by the NTSB. Source: Bolton, Perez & Associates Consulting Engineers

The National Transportation Safety Board (NTSB) offered an update on August 9 of its investigation of the March 15 collapse of a pedestrian bridge under construction in Miami.

As a result of the structural failure, a 174-foot-long bridge span fell about 18.5 feet, killing five vehicle occupants and a bridge worker. Eight other people were injured.

(Read the updated report.)

The update details the examinations of the bridge’s construction materials and notes the tests conducted including multiple concrete-compression core and steel-sample tests. The investigative update also includes an evaluation of a steel post-tensioning rod and the hydraulic jack used during the re-tensioning activity before the collapse.

(Read "NTSB Looks at Tensioning Rods as Bridge Collapse Probe Continues.")

NTSB investigators examined an approximately 5-foot-wide section of the bridge deck that was cut on either side of what is referred to as node no. 11 and 12, which was photographed and subsequently documented using 3D laser scanning.

The NTSB says it has interviewed employees from eight firms and organizations involved in the design, inspection and construction of the bridge.

Bolton, Perez & Associates Consulting Engineers has been added as a party to the investigation.

To contact the author of this article, email david.wagman@ieeeglobalspec.com


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Discussion – 3 comments

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Re: NTSB Offers Update on Bridge Collapse Probe
#1
2018-Aug-10 11:57 AM

I still think criminal actions against somebody are warranted for testing this structure while allowing public access under the structure. I know the NTSB investigation itself is not pertinent to this part of this tragedy.

Re: NTSB Offers Update on Bridge Collapse Probe
#2
lyn
2018-Aug-10 9:22 PM

Ask Congress how they could let this happen.

Re: NTSB Offers Update on Bridge Collapse Probe
#3
2018-Aug-11 2:04 PM

Conclusions?

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