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 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...
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...
Hello all,
Looking at rehabbing an old bridge deck by means of a partial depth deck replacement on the entire bridge. Existing deck and overlay would be hydrodemolished off to free the existing top mat of black steel. The top mat would be removed and replaced with new stainless steel...
Hello everyone,
I'm working on a single cell 6m wide by 3m tall (clear dimensions) cast-in-place concrete box culvert. The CL of the culvert is skewed to traffic (approximately 33 degrees). I just want to confirm the procedure to analyze this culvert before I get too far in... I'm thinking...
Hi everyone,
I just want to get your thoughts on how you would model this structure (having some differing opinions within office). Basically, the tank on top is being increased to hold more water and I am tasked with making sure the stand can support it. It is made of 2x2x1/4" mild steel...
Hey everyone, I'd like to get a feel for typical waterproofing details that are used for construction joints on CIP box culverts. I am wrapping up a design on a twin barrel CIP reinforced concrete box culvert that will be constructed in two stages (i.e. there is a construction joint the full...
My area of expertise is in bridges and other transportation structures, however I was recently tasked with the detailed design for a potable water pump station. I have never even heard of concrete hardeners before as they are not used in bridge construction as far as I am aware. The architect...
Working on a new pump station. Have a 600 x 600 x 1240 mm sump pit in my floor slab. Anyone have a typical structural detail for similar sump pit they can share? Thanks.
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David Amorim, M.Sc., P.Eng.
Hello all,
I am currently designing a cast-in-place RC twin-barrel box culvert to replace a deteriorating bridge. I have modelled the culvert based on the unit meter methodology from AASHTO and have supported the culvert on spring supports to which I assigned a vertical subgrade reaction...
Hello Eng-tips community,
I'm in Manitoba, Canada and I am designing several large overhead sign structures (12 sided galvanized steel structures) utilizing double-nut moment connections at the base. I've been using the 2015 AASHTO code for Highway sign structures and luminaires. Some...
