Footbridge collapse in New Delhi
Footbridge collapse in New Delhi
(OP)
Not a good look. The concrete deck was being placed, and down she came. This and other issues are making some countries and athletes reluctant to go to the Commonwealth Games.
http:/ /news.nine msn.com.au /glance/79 78694/dram a-as-bridg e-collapse s-in-delhi
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RE: Footbridge collapse in New Delhi
Mike Halloran
Pembroke Pines, FL, USA
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
Poems are made by fools like me, but only God can make a tree. engineers creates wonderful buildings, but only God can creates wonderful minds
RE: Footbridge collapse in New Delhi
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Footbridge collapse in New Delhi
Mike Halloran
Pembroke Pines, FL, USA
RE: Footbridge collapse in New Delhi
According to CNN's version of the article, "The bridge near Jawarharlal Nehru Stadium came down while workers were laying a concrete slab, said Rakesh Mishra, engineer-in-chief for New Delhi's Public Works Department." Not jumping to any conclusions, but being a student of forensic engineering, most collapses during construction of structures, especially while concrete is being placed, involve a lack of shoring or improper sequencing. But we will have to wait and see...
And with all due respect to Hokie66, there is a HUGE difference between an error in the structural engineering design, and a construction error that is related to sequencing, shoring, general means and methods... Not just important to those who may have fingers pointed at them, but for preventing it in the future, and for advancing the state of the art. IE, if it was a unique failure and something can be learned from it.
As a practicing SE I sure do not take responsibility, nor does any other engineer, for how our designs get built...
RE: Footbridge collapse in New Delhi
/mrlc, the metric system, Denmark
RE: Footbridge collapse in New Delhi
Mike Halloran
Pembroke Pines, FL, USA
RE: Footbridge collapse in New Delhi
mrlc has asked the question, and the answer is a resounding yes. If a structure requires a certain sequence of construction, it is the responsibility of the engineer to not only define that sequence, but to take all steps available to him to assure that the required methods are followed. I don't know if careful sequencing was required here or not...I simply stated that it was a structural failure which occurred during construction, which seems obvious.
RE: Footbridge collapse in New Delhi
Unless allowed for in the procurement brief such as a Design & build contract it would be unfair to expect an independent design engineer to take responsibilty for the temporary shoring works and sequencing. The contractor would have their own suitably competent and qualified specialists to interpret the design and sequence the construction.
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
I am in full agreement that the contractor should be warned of any special requirements etc. but experience shows that even when issued with a full detailed specification and method statement this likely to be ignored/overlooked by contractors opting to use alternative sequencincing and programming to suit their own way of doing things and chasing targets
RE: Footbridge collapse in New Delhi
Then place a statement on the drawings/specs that if the construction sequencing/staging stipulated by the engineer of record ion these drawings/specs is either needed or desired to be deviated from, then the contractor must contact the engineer of record in writing for additional instructions, and receive those instructions prior to proceeding according to such instructions. To do otherwise relieves the engineer of record from any and all liability from any documented or undocumented damage, present or future, resulting from such action.
Are you confused now? I am.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Footbridge collapse in New Delhi
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It is very difficult in my mind to decide who gets the blame from an engineering stand point. In the review of the failure of the bridge above, 4 or so different engineering firms were involved in the project. The different bodies are: GHD superintendent, AECOM design of the highway, sellick consultant designer of temporary works, Aurecon design of temp foundations. Then there are the contractors all experienced in the construction of bridges, Reynders Constructions, IFS scaffolding, Abergeldie contactors, Roads ACT.
Smec is the consulting engineers reviewing the failure event and have indicated the failure is due: "Lateral bracing of the girders was absent which affected their stability and bending capacity when subject to both horizontal and vertical loads. Web stiffeners were not installed at critical locations near concentrated loads being transferred from the girders to the cross heads and the cross heads to the props. Props were not fixed to the foundations to prevent uplift in the case where there was deflection and rotation of the main girders. "
From this you can see that a lot had to go wrong for a collapse and every member of the team can be implicated.
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Footbridge collapse in New Delhi
I hadn't read about that. That failure sounds like a failure of the temporary works, while the Delhi collapse appears to be a failure of the permanent works, albeit while still under construction.
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
There was a new's bit saying that not all the hangers were connected, that would overstress the closest one, make it fail and creating a zipper effect.
Other options would be design flaw, connection overstress.
But one thing that suprises and bothers me is that in the photos I have seen, the socket forks, although some of them bent, appear to be intact, while pins cannot be seen anywhere. Those socket assemblies are designed to be stronger than the hanger, so if overstress failure occurs, it does so on the bar/hanger and not on the socket/pin assembly. What about putting wrong pin size or material? That would cause failure and an inexperienced contractor might miss it.
In any case, I do not think we will ever know for sure.
RE: Footbridge collapse in New Delhi
http://www.youtube.com/watch?v=iBddYYwuLyI
BA
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
RE: Footbridge collapse in New Delhi
BA
RE: Footbridge collapse in New Delhi
Some of the cable connections are not destroyed, I think they contractor neglected to connect it, thus the steel frame was subjected to longer spans while casting the concrete, obviously will lead to failure.........it not designed for that spans,
If you need a special method to construct a whatever structure, the engineer should advise the contractor on the method – or it's sending a guy into a dog fight without telling him the dogs have rabies ?!?
RE: Footbridge collapse in New Delhi
BA
RE: Footbridge collapse in New Delhi
For the post which RE put up, the first two points sound like issues which should of been picked up by the engineer. When I'm onsite and see that lateral bracing has not been installed, I make note to the builder that bracing needs to be installed. Likewise the absense of web stiffeners should of been picked up by the engineer during the review of shop drawings.
RE: Footbridge collapse in New Delhi
http://www
You have to be a member to read it. I uploaded a print out of the news.
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