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 Post subject: Weak Bridge
PostPosted: Sun Aug 13, 2017 8:29 am 
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There's a road bridge near me on the A35, (speed limit 60mph) that has recently been declared "weak".

Signs have gone up on the A35 a mile either side of the bridge to say " Weak bridge, 40mph speed limit ahead"

Does my vehicle weigh more at 60mph than it does at 40mph?

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 10:28 am 
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yes dynamic load [pounding effect]is far greater in the same way a push is far gentler than a punch :boxing: :lol:

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 10:50 am 
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In answer to your question - no. However, the impact loading & stress imposed on the bridge will be reduced.


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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 11:23 am 
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If you go over a weak structure at speed it can cause a shock wave (like a bow wave) reduction in speed across the structure will spread the load more evenly, as well, as less vibration

edit. in relative terms a car does get heaver at speed as it gains mass, the air around the vehicle gets denser and creates downforce but it would be negligible at 60 mph


Last edited by Bob225 on Sun Aug 13, 2017 11:38 am, edited 1 time in total.

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 11:35 am 
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There's obviously much heavier stuff than my van that goes over the bridge, and it means they're on there (i.e. direct weight load on the bridge) for a proportionately longer period of time, isn't that worse than getting them on and off the bridge much faster?

:dunno:

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 1:13 pm 
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I make my missus get out and walk when we approach any weight limit signs.......

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 1:15 pm 
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It's the council or the road people so they probably used:
Image
Which AFAIK has nothing to do with weight or bridges, but looks impressive.

Then they put a 40 sign up.

Is there a weight limit as well? Unless it a humpback bridge or something that'd seem to make more sense to me.


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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 1:17 pm 
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A sign stating 'weak bridge' is pointless without an associated 'max weight' sign to go with it.

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 4:18 pm 
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There's never been a weight limit on the bridge and there isn't now.

There have been mutterings for the last five or so years about re-designing the whole junction and installing a new bridge or even a roundabout road but it's always been ruled out up to now.

Maybe this is a precursor to a back door method of re-designing the junction, nothing would surprise me when it comes to local politics and especially where roads are concerned.

Some of the junction alterations around here in the name of safety beggar belief, and are mostly necessary because of the poor driving standards of many old people.

Bridge is here:- https://www.google.co.uk/maps/@50.80475 ... 6656?hl=en


There is now a continuous line of cones down each side, just off the tarmac, this does make it seem so much safer. :roll:

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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 4:39 pm 
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The only "real" reason I can think of is if they're worried about the impact strength of the ironwork at the sides of the bridge. If there was an accident, and something hit it at speed, it could end up on the road below.
The real answer is a new wider bridge if course.

Reminds me slightly of something Mrs. Dave54 read out to me last night, about a local village having. "Welcome To" signs put up in both English and Cornish.
Money for everything except what really matters.


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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 8:47 pm 
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I went under that bridge yesterday! In future I will drive/cycle quicker under it, in case it collapses :lol:


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 Post subject: Re: Weak Bridge
PostPosted: Sun Aug 13, 2017 9:07 pm 
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Dave54 wrote:
The only "real" reason I can think of is if they're worried about the impact strength of the ironwork at the sides of the bridge.

Reminds me slightly of something Mrs. Dave54 read out to me last night, about a local village having. "Welcome To" signs put up in both English and Cornish.
Money for everything except what really matters.


That does at least make some sense.

If you want silly signs, take a look at this one, it's not the sign as such but the "gate" attached to it, almost every sign approaching the nearby roundabout sprouted these gates a couple of years back.

https://www.google.co.uk/maps/@50.77340 ... 6656?hl=en

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 Post subject: Re: Weak Bridge
PostPosted: Mon Aug 14, 2017 11:52 am 
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Look up your local 'Design for management of roads and bridges' (DMRB). Every council has there own specific one. It should explain things in there.



For this message the author Argyll has received gratitude : ayjay
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 Post subject: Re: Weak Bridge
PostPosted: Mon Aug 14, 2017 1:16 pm 
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ayjay wrote:
Dave54 wrote:
The only "real" reason I can think of is if they're worried about the impact strength of the ironwork at the sides of the bridge.

Reminds me slightly of something Mrs. Dave54 read out to me last night, about a local village having. "Welcome To" signs put up in both English and Cornish.
Money for everything except what really matters.


That does at least make some sense.

If you want silly signs, take a look at this one, it's not the sign as such but the "gate" attached to it, almost every sign approaching the nearby roundabout sprouted these gates a couple of years back.

https://www.google.co.uk/maps/@50.77340 ... 6656?hl=en


I wonder what the gates ended up costing.
Does it really need a sign for pedestrians and horse riders. They could add danger of slippery road (all those nasty leaves!), wild animals, and low flying aircraft (You never know!) Don't drivers have any common sense?
No hang on, don't bother answering that!
I hate signs, and the plethora of "street furniture" that seems to blight every town.
Masses of white lines and lane markers on junctions.
Bah! :cussing:


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 Post subject: Re: Weak Bridge
PostPosted: Tue Aug 22, 2017 4:18 pm 
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£4,000,000 for a new bridge!!! :wtf:

How do they come up with a figure like that; for a two lane bridge over a two lane road?
I can understand that 50 quids worth of welding won't fix it, but four bl**dy million!! :cussing:

Someone is planning on trousering a tidy wedge. :roll:

http://www.bournemouthecho.co.uk/news/1 ... 4_million/

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