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Good morning, I am working on a new building that is right up against an existing building, where there are passages between the new and existing buildings. Neither the new or existing buildings has a basement, they are both founded at grade. At upper levels, I have expansion joints to separate...

Good Afternoon, I am working on a model and comparing my hand check of the structure mass to the value calculated by Etabs. I notice that my hand calculation of 1.0SW + 0.8SDL matches with the numbers I get from etabs if I create a load combination 1.0SW + 0.8SDL, but it does not match the...

Good Morning, I am determining the snow drift load on a low roof, which is adjacent to a high roof. I know that the leeward case is covered by snow load case I for lower level roofs (4.1.6.5), and the windward case is covered by Case II. Out of interest, I wanted to see how the load would...

Good Morning, I am trying to wrap my head around pre-tensioned anchor rods; I have read a number of other threads and am still not quite there. If I have an anchor rod pretensioned to 1500kN, and this is anchored into a concrete pier, does this add a 1500kN compression force to the concrete...

Hi, I am coming onto a project with vertical post-tensioning designed as bonded post-tensioning, with grouted encasement. The tendons have been installed and stressed, but there has been a delay of several months, and the ducts have still not been grouted. They have been protected from...

Hi! I am designing a roof with an RTU screen at a mechanical area. I am wondering if there is a clause in the NBCC (or ASCE) that tells me how much clearance i need between the bottom of my screen and my roof to ensure that snow drift will not occur at the screen? Is it as simple as calculating...

Good Morning, I am doing an analysis of an existing slab, and I'm interested in finding out how much rotation I would get at a point if I create a free edge (unrestrained from rotation) Does anybody know how i can determine the slab rotation at an edge in SAFE? Thanks so much!

Hi, I am wondering if you are treating parking loads as assembly loads for live load reduction under NBCC? Thanks so much!

Hi! I mean this: vs. this

Good Morning, I have always used a trapezoidal / triangular soil bearing distribution when checking the maximum bearing on a gravity footing with eccentric loading. I have been told by others at my office that I can use a rectangular distribution instead, with the average bearing pressure...

Good Afternoon, I am designing several squat concrete shear walls with door / window openings. I haven't done this before and am wondering if anyone might be able to recommend any useful references or examples that they know of? Thank you so much in advance!!!

Good morning, I have received a contractor request to cut a new opening ~900mm x 900mm in an existing deep reinforced concrete beam (this is a perimeter wall and supports some vertical gravity loads, but does not retain soil. It spans between pilasters / pile caps). Based on the same ideas for...

Hi, A contractor has asked to replace beam stirrups at several locations with hairpins (135deg hook each end). I don't love this idea, but can't seem to find any reason to say no. I am wondering if there is any reason or code clause that would go against this change? Thanks!

Thanks very much everyone for your input!

Good morning, I am working on a post tensioned concrete slab, and have an opening cutting off my core wall from the slab. Usually I would run tendons through the core wall, ensuring that they can exit the other side. From my understanding, this is to meet integrity reinforcing requirements...

Good Afternoon, I am working with the farm building code and am having some difficulty with how it is laid out. There is a clause (cl. 2.2.1.11) that relates to tower silos, and another (2.2.1.14) that relates to storage for dry grains. If I have a tower silo for storage of dry grains, which...

Hi! I have an embed plate with an infinite wall on all sides that is taking only shear. My shear force is pretty high (this is a girder framing into the end of a wall), and so I am thinking to design an embed plate with 20M rebar welded to lap with continuous 20M bars in the wall. To check this...

Good Afternoon, I've received a contractor request to switch to spiral ties in CFA piles, but looking at the Canadian code there is a minimum spiral tie pitch of 75mm. Has anyone done this before? This seems impractical and difficult to do, but I wonder if I am overlooking a clause that may...

Good Afternoon, I am trying to model a floor in SAP to determine its frequency. So far I've done the following: 1. Modelled all the beams 2. Determined the I_cr.dynamic for the deck + topping (in steel units - i.e. concrete I is transformed based on the modulus of elasticity) - I got this from...

Good Afternoon, I am working on a project with many transfer beams framing into the perimeter retaining walls. I have checked the walls for bearing and also using the emperical wall formulas, and they work, but I wanted to do another check, considering each wall segment as an unconfined...