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Old March 23rd, 2016, 05:48 AM   #3741
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Quote:
Originally Posted by ChrisZwolle View Post
There are some bridge types that are 'fracture critical', i.e. if one beam is compromised, the entire bridge could fail. It occurred with two high-profile bridge failures in the U.S., the I-35W bridge in Minneapolis and a bridge of I-5 north of Seattle which was struck by a truck as well.
"Fracture Critical" has a specific meaning. It is for tension members where failure of the member will likely lead to collapse of the bridge. It is tension only, because steel can fracture in tension abruptly and without warning under repetitive loading.

What you are referring to are single load path structures, where the member can be tension or compression and failure of the members can likely lead to failure of the structure.

I-35W was cause (primarily) by the buckling of a gusset plate, in compression. It was also overloaded by construction equipment and materials.

I-5 was caused by an overheight truck striking the the upper lateral bracing. This in turn pulled in on the top chord, which caused it, a compression member, to buckle. In Ontario, the connection of the bracing to the top chord is generally a much lighter connection and the bracing just tears out. That is what happened on the Burlington Skyway a few years ago.
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Old March 24th, 2016, 09:42 PM   #3742
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Video of the 427 through western Toronto:

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Old March 30th, 2016, 02:45 AM   #3743
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http://www.therecord.com/news-story/...-in-morriston/

The Highway 6 Morriston bypass received funding today. This project will see a 5km bypass built to 400 series standards around Morriston, which is currently a large bottleneck on Highway 6. The project also includes widening a large portion of the 401 to 10 lanes, for the part of the 401 that highway 6 interlines with. It also includes a reconstruction of the Hanlon Parkway's interchange with the 401. The current roadway is only 2 lanes, and has an AADT of over 25,000. This is long overdue.

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Old March 30th, 2016, 02:57 AM   #3744
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I wonder if it will be 4 lanes, or if it will be more like the Hwy 6 Mount Hope bypass as a controlled access 2-lane...

That 401 interchange looks so complicated for 25 000 vpd, Ontario is so weird
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Old March 30th, 2016, 03:12 AM   #3745
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Another image.. hopefully a bit clearer. Its essentially a reconfiguration to reflect that it will now be a local road. Not sure what is going on in my first image, honestly.

And yes, it will be a 4 lane road. Thus why I said 400 series standards.
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Old March 30th, 2016, 07:14 PM   #3746
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Originally Posted by Kanadzie View Post
I'm surprised the bridge didn't fall down.
The span was opened to traffic around 1962 (not the 1934 span next to it) I am thinking from the picture, but it has considerable corrosion issues (under repairs for the past 10 years...)

It's always surprising how small the roads in Montreal are compared to Toronto
Remember when the dump truck did the same thing to the Toronto-bound Burlington Skyway?
Did the Mohawks do it?

(Can't believe I haven't been on this thread in this long....)
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Old March 30th, 2016, 07:48 PM   #3747
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Quote:
Originally Posted by Innsertnamehere View Post
http://www.therecord.com/news-story/...-in-morriston/

The Highway 6 Morriston bypass received funding today. This project will see a 5km bypass built to 400 series standards around Morriston, which is currently a large bottleneck on Highway 6. The project also includes widening a large portion of the 401 to 10 lanes, for the part of the 401 that highway 6 interlines with. It also includes a reconstruction of the Hanlon Parkway's interchange with the 401. The current roadway is only 2 lanes, and has an AADT of over 25,000. This is long overdue.

Is there any information available on the 401 widening, in particular the two exits between which the widening will be done?
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Old March 30th, 2016, 11:54 PM   #3748
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Between Highway 6 (Hanlon Parkway) and Highway 6 (Queen st.). As I said, Highway 6 interlines with the 401 for a few km and that is the part of the highway that will be widened.
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Old March 30th, 2016, 11:56 PM   #3749
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best graphic I've found showing the project.. hopefully this is clearer. I couldn't find anything this good before.

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Old April 1st, 2016, 02:23 AM   #3750
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Hwy 427 in Toronto at night:



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Old April 1st, 2016, 02:59 AM   #3751
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I like the 427. It always seems to work pretty well even. Though the 401 does not
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Old April 1st, 2016, 03:33 AM   #3752
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Yeah. Agreed, the 427 is probably one of the best functioning highways in the GTA. I quite the like the urban canyon effect the new towers that have been constructed north of Bloor give to the highway as well.
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Old April 1st, 2016, 04:04 AM   #3753
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indeed it is starting to get this "megacity" feel to it
The buildings along the Gardiner are more impressive but the Gardiner itself is too small and ugly
Whereas the 427 is clean, in good condition and mega-also
Even the number 427 looks aesthetically pleasing on the signs (certainly the nicest crown signs )
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Old April 1st, 2016, 08:21 AM   #3754
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On a side note, do we still need to put "km/h" on our speed limit signs?
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Old April 1st, 2016, 01:21 PM   #3755
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Originally Posted by smokiboy View Post
On a side note, do we still need to put "km/h" on our speed limit signs?
you really want numpties from your neighbour thinking the limits are in mph?
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Old April 1st, 2016, 04:42 PM   #3756
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Good point. But what is their excuse for puting M P H, on some speed limit signs?
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Old April 1st, 2016, 05:21 PM   #3757
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Numpties from Canada?

(Actually, Brazil - just judging from the pictures we see here - seems to use "km" on a lot of signs. That seems unnecessary.)
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Old April 1st, 2016, 07:33 PM   #3758
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Quote:
Originally Posted by smokiboy View Post
On a side note, do we still need to put "km/h" on our speed limit signs?
Even Quebec puts the km/h on the speed limits when they are suggested but never when they are mandatory

The Ontario approach is kind of weird. It seems almost all signs from the MTO have the km/h tab (on legal speed limts / white signs) but almost all signs maintained by municipalities have no km/h marking (in other words, standard Canadian speed limit sign)
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Old April 2nd, 2016, 01:02 AM   #3759
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A couple of pics of the 401 construction in Cambridge. Doesn`t look very interesting at this point...







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Old April 3rd, 2016, 04:24 AM   #3760
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Not mine, but worth watching:

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