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CSA A23.3 Concrete Wall Design

CSA A23.3 Concrete Wall Design


As my previous post explained Link, the Canadian company I work at will soon be getting into mid-rise concrete building projects. I’m involved with making a software selection for the company in order to assist us with the design of these projects. I’ve done some pretty extensive research on RISA (3D, Floor ES, Foundation), which has seemed quite promising. My concern is the lack of CSA A23.3 code support for concrete wall design (gravity and lateral). After speaking with someone at RISA I’ve confirmed concrete wall design to CSA A23.3 will be supported in RISA Floor v13 and RISA 3D v17. It seems like foundations, columns, beams, and slabs can all be done as per Canadian code currently which is a perk. I’m curious how the Canadian engineers who have RISA deal with this? Do you ensure the reinforcement/wall thickness is correct to determine the loads in the walls then design using spreadsheets? The other software option we’re considering is the CSI America programs (ETABS, SAP2000, SAFE) due to their Canadian code support.


RE: CSA A23.3 Concrete Wall Design

We use RISA extensively here and perform wall design exactly as you indicate. Use the program for the analysis and then spreadsheets for the design. It seems to work pretty rosy for now. Can't wait for them to include wall design for the Canadian users.

RE: CSA A23.3 Concrete Wall Design

When I've used RISA, I've used it for analysis, only... and excellent tool... for design, I'm a bit of a dinosaur... I use excel spreadsheets for steel or concrete.


RE: CSA A23.3 Concrete Wall Design

Thanks for the input jayrod12 and dik, I was hoping you guys would chime in. For your spreadsheets, do they typically handle strength checks to get reinforcement requirements only? Or do you do serviceability checks in the spreadsheets as well, as opposed to leaving drift/deflection calculations and checks up to RISA? I imagine it can get quite convoluted when you have a slab deflecting relative to a beam, etc.

RE: CSA A23.3 Concrete Wall Design

I take a look at the force outputs from Risa and see if they make sense I may do a quick fixed end for an interior span or a ql2/16 for an end span -ve or maybe a ql2/11 or 12 for an endspan +ve... or whatever I feel like that day and if Risa's output is approx... I assume the balance of Risa's output is more or less correct... I take a serious look at support condition moments... shears a little less arbitrary, and axial loads quite carefully... I may 'meatball' a calc, except for compression elements... it's a good check...

I then use spreadsheets for design in concrete or steel or a couple of programs I wrote in Delphi... conc columns, walls, interaction diagrams and biaxial bending...Other than support conditions, and they depend on how I model them, I have 100% confidence in Risa's output.


RE: CSA A23.3 Concrete Wall Design

Serviceability checks are rarely a concern for concrete walls in my projects. If you are talking drift, then I generally rely on Risa's output but I've checked it by hand a few times and am confident the approach is sound.

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