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Hello, We're looking at an overhead sign structure that has a vertical shaft flange to cantilever arm flange connection. All elements including fasteners are galvanized. Bolt holes were only oversized by 2mm and we're finding that the bolts are not fitting into the holes due to zinc pick-up...

Hi Mixtli, You'll note the following text in the preface to the Manual: Although Municipalities in Ontario generally own their own structures, in my experience, they tend to do things in accordance with MTO Standards including the structures manual. If you've inspected an Municipal bridge...

As I figured would happen, there is a little more action on the welding sub-forum than there is here. Thanks JStephen - there were no specified requirements for any of the items you mentioned. What we are now trying to determine is if there is some minimum level of care that is supposed to be...

Thanks for the comments guys. EdS - if I have to remove these now, I would just go with aluminum... We've done aluminum stairways into the sister reservoir and 20 years later they are still immaculate. As you can imagine, whatever the action is moving forward, the question is at who's expense...

Hi all, Question for you (also posted in the structural subforum) - We installed an alternating tread stair system into a potable water reservoir two years ago. The railing on the platforms was spec'd as Type 316L SS while the alternating tread stairs were fabricated from Type 304 SS. As you...

Hi all, Question for you (also posted in the welding subforum) - We installed an alternating tread stair system into a potable water reservoir two years ago. The railing on the platforms was spec'd as Type 316L SS while the alternating tread stairs were fabricated from Type 304 SS. As you can...

Sorry HotRod10, I understood that but wasn't clear in my post. That being said, if your Client is fairly progressive and IF the concrete friction by itself is more than adequate without rebar, depending on your level of comfort, the Client may allow you a design exception and not require shear...

As HotRod10 mentioned, calculations would most certainly show that interface friction due to scabbing of the deck alone is not sufficient to develop full composite action... some level of interface shear reinforcement will likely be required. I like the suggestion to go into the webs if...

Agreed with the above, a crash-protection wall is definitely required. Reviewing and designing to AREMA is a must. Here are a couple of snippets from CNR (Canadian National Railway) standard details that provide some reference as to what we use up here in Canada. Piers fabricated from concrete...

Haha, first time I've heard about having to take cows into consideration in the design... clearly not a design constraint in my neck of the woods! I imagine they wouldn't be too pleased with rip-rap in that case.

I'll send down some Winnipeg Jets pucks! haha

Depends how much the Client is willing to spend? Sandblasting and metallizing would likely the best best... Waterblasting and painting (epoxy) if you are worried about budget. Any consideration to lining the channel with a rip-rap blanket rather than a concrete apron? Would be quicker/cheaper as...

You definitely need to design the barrier/anchorage for whatever TL level the Client requires. As mentioned above, typically a standard load tested barrier is used so design of the barrier itself can be skipped. However, one should ensure that the anchorages to the existing deck are satisfactory...

Thanks for the link bridgebuster! I will look into it.

Dik - design loading was in accordance with CSA S6 CHBDC code. Based on the detail category and number of stress cycles, the fatigue life calcs from S6 indicate that the life of the detail was surpassed 2 years ago. KootK - we typically investigate fatigue prone details when completing...

Hi all, Working on a major rehab for a structure constructed in 1952 (simply supported steel girders, non-composite CIP deck). The girders were made continuous for live load in 1984 with the use of this detail... Plates were welded onto top of top flange, webs, and top of bottom flange...

Thanks Canuck65, that is some good info. I have reached out to a couple hydrodemolition experts to go over the plans with them and get their feedback. They'll be able to give me all of the equipment loads required as well for the analysis. The structure is fairly low over a small creek. We were...

The issue with the smoothness and membrane has become a VERY hot topic on a project we are currently working on. It is for the rehabilitation of a potable water reservoir that was originally constructed with a hollowcore slab roof. The roof was never insulated (left open to Manitoba seasonal...

BridgeEI - I have zero concern with the girder capacity (just for some more info, this bridge was constructed in 1952 and is a steel girder bridge with CIP concrete deck - non-composite construction). It is more of a question regarding the integrity of the roughly 4" deck that will be left after...

I guess both my concerns are pretty easy checks. The weight of the specified hydro demo and construction live load equipment can be compared against the thin remnant of the existing deck after hydrodemo. Also, the concrete bond been the two layers can be checked to see if it can handle the shear...