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N. Prabhakar General Sponsor
Joined: 25 Apr 2009 Posts: 474
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Posted: Thu Jul 07, 2016 2:26 pm Post subject: |
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Dear Er. Harsoda Ji,
Thank you for uploading the YouTube video about the collapse of the old bridge.
It appears that the main deck slab, spanning between the piers, was simply supported. As I said earlier, it is a failure due to maximum bending moment combined with maximum shear that occurred when the wheels of the bus were at the points of failure, ie. at about 1/4 of span from end supports. Because it is an old bridge, may be with poor maintenance, the strength of the deck slab must have deteriorated very badly over the years. After the failure, The bus has moved from the point of failure to the extent possible.
These are my observations from the photograph and the video.
With best wishes,
N. Prabhakar
Chartered Structural Enginner
Vasai (E), Pin 401 208
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VPandya General Sponsor
Joined: 09 Nov 2009 Posts: 842
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Posted: Fri Jul 22, 2016 3:48 pm Post subject: For fixing aging Roads & Bridges US creates new Department. |
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Dear Er. Harsodaji,
For taking care of huge backlog on aging Roads and Bridges ( Infrastructure) , US Govt. creates a new department. We in India for our aging Infrastructure ( Roads & Bridges) may need to do something like this. What they are calling " FASTLANE GRANT PROGRAM OR ONE-STOP SHOP ".
From latest American Society Of Civil Engineers (ASCE) Smartbrief : dated 22nd July 2016:
With New Build America Bureau, Government Wants to Streamline Road Repairs and Infrastructure.
New initiative by the Department of Transportation seeks to cut red tape and create shortcuts on the road to infrastructure repair.
In an attempt to jumpstart repairs of U.S. roadways and begin addressing the huge backlog of infrastructure projects across the country, the U.S. Department of Transportation just announced the opening of the Build America Bureau. At a press conference earlier this morning, Transportation Secretary Anthony Foxx celebrated the opening of the Bureau, which seeks to streamline the application process for federal funding and help public and private investors obtain loans, support, and expertise.
The Bureau, brings together expertise from a variety of agencies, and offers a one-stop shop for access to loans, including the $800 million FASTLANE grant program, highlights Foxx’s belief in more effective government and a focus on public-private partnerships.It will help streamline access to existing funding sources and take advantage of recent funds provided by the FAST Act, the highway bill signed last fall.
Web-Link :
http://www.curbed.com/2016/7/20/12235932/with-new-build-america-bureau-government-wants-to-streamline-road#comments
Regards.
Vasudeo Pandya P.E.
Structural Engineer
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B.V.Harsoda General Sponsor
Joined: 19 Jan 2009 Posts: 2329 Location: RAJKOT,GUJARAT, INDIA
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Posted: Wed Jul 27, 2016 2:45 pm Post subject: |
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Structural awareness at each and every level of project management in construction project is very important for Structural safety.Negligence of safety measures leads to accident, below photo of Ahmedabad Metro is witness of this.
It is requested to Respected Er. V. Pandya Sir from Ahmedabad for his expert comment in this issue.
Source link:-
http://epaper.divyabhaskar.co.in/index.php?editioncode1%2F
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VPandya General Sponsor
Joined: 09 Nov 2009 Posts: 842
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Posted: Thu Jul 28, 2016 4:12 pm Post subject: Height of only Reinforcement cage without concrete seems to be the problem. |
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Dear Er. Harsodaji,
IN USA we ask FORENSIC Engineerig companies ( specializing in Investigating failures) to find the real cause of such failures. One very well known Forensic Engineering company in USA is " WISS JANNEY ELSTNER ASSOCIATES ". ENGINEERS like me who are dealing with only Structural Analysis and Design will not give their opinion on such failures. However I can make a wild guess :
"Height of only Reinforcement cage without concrete seems to be the problem. It is like Long Column effect ( Slenderness) of a Column which has only Tied Reinforcement as a column section. " What AXIAL Stiffness (For Self Weight of Reinforcement Cage as Load) or FLEXURE Stiffness (For accidental Lateral Load during construction) is there in a TALL Concrete Column with Tied Reinforcement cage only as Column Section. Only REBARS and no CONCRETE for such height."
I am sure there are ACI Guidelines ( Construction Tolerances) for such concrete Pier Construction .
Regards.
Vasudeo Pandya P.E.
Structural Engineer
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B.V.Harsoda General Sponsor
Joined: 19 Jan 2009 Posts: 2329 Location: RAJKOT,GUJARAT, INDIA
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Posted: Fri Jul 29, 2016 2:57 am Post subject: |
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Thank You Sir, I believe that, this incident is purely negligence of Safety Engineer to allowed such unsafe methodology in construction from contractor side and also from project manage ment authority.
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N. Prabhakar General Sponsor
Joined: 25 Apr 2009 Posts: 474
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Posted: Fri Jul 29, 2016 5:11 am Post subject: |
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Re-written
Last edited by N. Prabhakar on Fri Jul 29, 2016 6:44 am; edited 1 time in total |
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N. Prabhakar General Sponsor
Joined: 25 Apr 2009 Posts: 474
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Posted: Fri Jul 29, 2016 6:43 am Post subject: |
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Dear Er. Harsoda,
It is really foolhardiness on the part of the Engineers at site concerned with this project to erect such a huge reinforcement cage to its position without having any lateral support. One need not have a standard code or specification written for such an erection, but it is just commonsense one should apply for it.
N. Prabhakar
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VPandya General Sponsor
Joined: 09 Nov 2009 Posts: 842
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Posted: Wed May 05, 2021 3:42 am Post subject: Maxico Train Bridge Collapse , 24 people died |
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Dear Sefi Engineers ,
Recent Bridge Collapse in Maxico .
Mexico City train overpass collapse kills at least 23, dozens more injured
THE NEW YORK TIMES
A metro overpass collapsed late Monday in Mexico City, sending the cars of a train packed with passengers plunging to the ground and killing at least 23, including children, the city’s mayor said.
Public Safety concerns are of PRIME IMPORTANCE in our Profession of Structural Engineering .
Regards.
Vasudeo Pandya P.E.
Structural Engineer
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RECENT BRIDGE COLLAPSE IN MAXICO |
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vikram.jeet General Sponsor
Joined: 26 Jan 2003 Posts: 3835
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Posted: Wed May 05, 2021 4:48 am Post subject: |
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Overpass collapse in Mexico city
Highways Bridges & culverts needs special attention in terms of inspection, structural audit and strengthening as a part of regular maintenance . Inspection gangs must inspect on routine basis as it is being done in Indian Railways Engg Deptt.
Bridges which have outlived their lives must be specially seen for replacement with new ones.
Any such mishap leaves a black dot on engineering fraternity ,.There is need to keep sufficient funds / budget for maintenance & strengthening activities.
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