I am designing reinforcement for existing footings and the top of existing footings have to be excavated and exposed. The top of the deepest footings is about 2m below top of slab-on-grade. This is inside an industrial facility, so the less slab-on-grade I have to demolish the better (i.e. no...
I am designing a two-storey structure. Steel moment frames in one direction and braced framed in another. Floor slab is composite deck with concrete topping. The structure will have a concrete elevator shaft that is quite eccentric to the centre of mass. The top of shaft is somewhere between the...
1) I am designing major modifications to an existing one-storey structural steel building. I am not able to verify the horizontal diaphgram capacity of the steel deck to resist the higher seismic loads based on the latest code. I will need to add new horizontal bracing. Existing roof structure...
Dik,
No I cannot put x-bracing left of Grid B.
Chessanyone,
Free movement is only needed perpendicular to expansion joint. So a slotted connection will be provided. Actually, what you said is what I was thinking, which is to have a strut on each side of the expansion joint. The connection to...
I've attached a screenshot to help explain. I have an L-shaped structural steel building (steel columns and roof OWSJ) with diagonal cross bracing at building perimeter. I need to place an expansion joint at the re-entrant corner due to building length. Under horizontal loading in the direction...
I have a one-storey steel structure (no basement) founded on pile caps with deep foundations. The ground floor slab was designed as a suspended slab with grade beams. Roof over a portion of the building will be demolished and a new roof constructed at a higher elevation. This new construction...
I have not really been designing these last few years. Working on a design at the moment and have to calculate snow accumulation due to adjacent high roof.
Looked up NBCC/OBC code and noticed just how convoluted the calculation for snow accumulation has become. Am I alone here in thinking the...
I am evaluating an underground structure which is about 50+ years old and which is still in service. This structure will see a temporary increase in surcharge load and I want to check whether or not this structure is capable of withstanding this new load. I have record drawings showing...
I am evaluating an existing roof deck to receive new roofing for a building which was constructed sometime in the 1950s. Original drawings show that a 4-1/2" thick 'aerocrete' roof deck spanning up to 7' between beams. No other information is shown regarding concrete strength or density. There...
Hi,
I am designing a foundation wall with a strip footing located above an existing sewer. The footing is minimum 6 feet above the existing sewer (not allowed to go any closer).
As I do not want to add any load to the existing sewer, I am thinking about designing the wall to span over the...
Hi all,
I have concrete pavement (about 12" thick) that is sitting directly on top of an underground structure. There is waterproofing between the pavement and the underground structure. However, the contraction joints for the pavement look very deteriorated and I want to rehabilitate these...
Hi all,
I am designing an expansion to an existing two-storey building (see the attached sketch). The new structure consists of steel beams and columns. I also need a non-load bearing block wall (for fire separation) between the two structures.
The columns and block wall need to be as close as...
Hi JAE,
Thanks for your response.
The first solution you proposed is the one I am currently sitting on. However, I was thinking of installing a transfer beam that is doweled through the concrete pier with a micropile on each end of the beam (2 total) with a slight batter towards to the...
Hello friends:
I am trying to come up with some solutions for this design. I am designing a new elevator structure with a deep pit on the side of an existing building. I have attached a sketch showing the new and existing structures, and their relationship.
Considerations/Challenges:
-The new...
I am designing a repair detail for a small area of slab soffit that spalled near an expansion joint. I want to use stainless steel mesh below the existing bottom layer of black bars to keep the new patch together. Thinking of using wire ties to hang the new layer of mesh to the existing layer of...
If I am drilling deep, there is a risk that the drill bit might go through the conduit that illuminates the sign) at the centre of the pile where it bends into the soil. The bend is usually 2’ below grade but I imagine its depth can vary significantly. Is there any way, other than not drilling...
Sincerest apologies Hokie, you are a familiar name but I've always read your name in my head as "Hookie"
Thanks for the input. dhengr's approach seems best.
I am also looking at another sign base but this one is a little different, the top of the pile is above grade and the anchors are...
Hi all,
I have an existing caisson supporting a sign post where the top of the caisson is below the sidewalk. The sign will be removed and the caisson will be re-used to support the new sign. I want to place the new sign base plate above the sidewalk surface (with a protection box) to allow...
