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Re: Tram and South Rd closed - for a worrying reason
Posted: Wed Jan 25, 2017 9:54 am
by Nort
I'd say bit of fear mongering, with doing extra checks being a good idea.
I doubt there is any connection that means what happened with this overpass would affect the tunnel construction, however with any construction there is a chance of things being done wrong. If there are any problems and they catch them now then no biggie. If they came up later then they would still get fixed, however there would also be media cries of a faulty construction epidemic, opposition out in force etc.
Re: Tram and South Rd closed - for a worrying reason
Posted: Mon Feb 20, 2017 12:03 pm
by monotonehell
A flaw in design, irritated by the sail like quality of the anti-throw screens caused the ped-cycle pathway to fault according to the engineering report.
An engineering report blames a flawed design for the problems affecting the shared cycling and pedestrian overpass, which was built less than a decade ago. A beam shifted off its bearings and debris fell from the overpass, with an engineering report now confirming the design was inadequate.
"This resulted in girders tilting sufficiently to render the bearing restraint system ineffective and essentially free the bearings," the report found.
Engineers said the effects of wind against screens along the sides of the overpass caused lateral movement over time "until the bearings had moved sufficiently for the girder to lose support".
Four engineering recommendations have been made in the report, including removing the overpass screens to reduce the lateral loading on the bearing system.
Transport and Infrastructure Minister Stephen Mullighan said work would start immediately to remove the screens.
http://www.abc.net.au/news/2017-02-20/s ... ns/8285452
Re: Tram and South Rd closed - for a worrying reason
Posted: Mon Feb 20, 2017 12:23 pm
by AG
AG wrote:
Because of the tall and narrow length of the beam, it's possible any significant eccentric (off centre) loading such as the side barriers may have contributed to the beam rotating as well, although not necessarily the cause of the failure in the first place.
Called it... although the Aurecon report contributes wind loading rather than pure eccentric placement of the side barriers as the cause.
Re: Tram and South Rd closed - for a worrying reason
Posted: Mon Feb 20, 2017 12:39 pm
by Llessur2002
AG wrote:AG wrote:
Because of the tall and narrow length of the beam, it's possible any significant eccentric (off centre) loading such as the side barriers may have contributed to the beam rotating as well, although not necessarily the cause of the failure in the first place.
Called it... although the Aurecon report contributes wind loading rather than pure eccentric placement of the side barriers as the cause.
Bingo!
Re: Tram and South Rd closed - for a worrying reason
Posted: Mon Feb 20, 2017 5:53 pm
by rev
So who designed it? Are they now liable for paying compensation to the state gov. and/or paying for repairs and alterations to the design?
Re: Tram and South Rd closed - for a worrying reason
Posted: Mon Feb 20, 2017 8:23 pm
by Norman
rev wrote:So who designed it? Are they now liable for paying compensation to the state gov. and/or paying for repairs and alterations to the design?
They are currently in negotiation, so that means the lawyers will be bickering over that one.
Re: Tram and South Rd closed - for a worrying reason
Posted: Tue Feb 21, 2017 6:42 am
by AG
rev wrote:So who designed it? Are they now liable for paying compensation to the state gov. and/or paying for repairs and alterations to the design?
I believe that AECOM were responsible for structural design, and Wallbridge & Gilbert did the certification.
Re: Tram and South Rd closed - for a worrying reason
Posted: Tue Feb 21, 2017 3:10 pm
by rev
Wallbridge & Gillbert are involved in quite a bit of government stuff and some big projects.
I believe they were involved with the nRAH as well.