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The stack is flue gas stack and will be made of steel. The foundation will be concrete. Thank you for the help!

Thanks @BridgeSmith! Good point - I will run numbers to see if I can come up with a practical pile cap size that will result in smaller uplift loading. For the single caisson suggestion, is a caisson of 2.5m to 3m in diameter even feasible? This will require a steel casing to be driven into the...

I am not involved in the design of the stack. Sounds like I will need to request base reactions for the stack from the designer/manufacturer. How will the temperatures/thermal effect impact the foundation? Are you referring the the base ring of the stack expanding and contracting? If so, I can...

Hi Group, I am looking for foundation design guidance for a 40m tall and 2.5m in diameter stack for an industrial building. The native soil is 3m below the finished grade and will mos likely require a deep foundation solution. What are the design considerations i.e., seismic and wind lateral...

Hi Group, For one of our project, contractor had installed the column and framing on levelling plate and nut with column bases ungrouted. Before the GC had a chance to go and grout all column bases, the steel contractor used cables for temporary supports that were tied to column base at a few...

Hi Group, I had a column with a 10"x10"x1/2" base plate with 2-3/4" sitting on 1.5" grout for a project. The contractor somehow did not get the top of footing and anchor bolt location correct. The underside of the baseplate is 3.5" from top of pier. They ended up slotting existing holes to fit...

Thanks KookK & Jerseyshore! I will be specifying the hanger within 6" of the panel points to avoid bending in the bottom chord.

Hi Group, I need to specify connection between back-to-back channels to the bottom chord of the joist. The channels are there to support pipe hangers. The total load at each end of the channel will be 1500 lb. I am envisioning a connection similar to the one below. Instead of full length rod...

Ducts are simply resting on pressure-treated wood on insulation - the duct supports are not tied to the roof structure. The duct self-weight is not enough to resist the uplift. Also, attaching the guy-wire straight down to the joist is complex as typically I provide a spacer HSS below the top...

I understand the need to resolve the torsion via stiffeners and kickers - however - the challenge is that there is no access to any of the beams from below. There are lots of services below roof framing making it difficult to reach any location. Therefore I am trying to explore other creative...

This will require the stub baseplate to be directly at the top of the joist - I may have to consider vertical legs attached to the anchor base plate so that it can be connected to the beam on wither side of the joist shoe. I can also specify strengthening the joist shoe weld to the beam. This...

Hi Group, I need to provide guy wire anchors to support the mechanical duct for wind uplift. The wires will be installed at roughly 45-60 degree angle and the guy wire anchor will consist of a round HSS tube with eye-bolt and base plate that will be welded to the roof beam top flange. There...

Hi Group, The client wants to use a metal deck with checkered plate in a penthouse floor. Note that the metal deck is the primiary structural element supporting the selfweight of the floor and and other live loads - the checkered plate on top will be only 1/4" thick plate with epoxy finish to...

Thank you for the feedback. In terms of the pile cap design, Timothy Mays - Design Guide for Pile Caps analyzes the pile based on the sectional method instead of strut & tie. In the Canadian code, the concrete design handbook indicates a sectional method resulting in tension reinforcement that...

Thank you! This is good information. I did find the design guide you mentioned. It is useful and also comes with an Excel file for quick calculation of the pile cap. For a 200 kN load, I am getting a pile depth of 762mm. It seems quite deep for a cap but I guess it is what it is.

Hi Group, I am seeking some guidance on designing a concrete pile cap for a foundation supported by helical piles. I am adding a new column inside an existing building to allow roof framing modification for new roof openings. The column is interior and will not be resisting any lateral load...

Following this post for some further guidance. @mountaineers19 did you find any useful references to complete the design? I am having to design a similar connection. An added challenge to my situation is that the hanging load comes with a stainless steel plate. I am thinking of using...

BAretired, It was a typo. In my mind I was typing 8" and then changed the number to 200"mm".

DaveAtkins/Roukkia, Lapping the new dowels will require about a 500mm hole into the existing footing close to the existing rebar location on all 4 sides. I think there will be issues with bars at the corners hitting each other and also, concrete splitting. I am thinking of providing dowels...

Hi Group, I have a 2.7m x 2.7m wide-spread footing with a 0.6x0.6 pier. The client is adding a rooftop unit that results in bearing pressure greater than the allowable based on the record drawing. In the past, I have underpinned the existing footing by pouring a larger pad below the existing...